CN115812642B

CN115812642B - Sea water fish desalination seedling raising method

Info

Publication number: CN115812642B
Application number: CN202211448538.XA
Authority: CN
Inventors: 伊祥华; 母昌考; 郭敬功; 王强; 任志明; 戴华伟; 伊文兴
Original assignee: Xiangshan Lanshang Ocean Technology Co ltd
Current assignee: Xiangshan Lanshang Ocean Technology Co ltd
Priority date: 2022-11-18
Filing date: 2022-11-18
Publication date: 2024-06-07
Anticipated expiration: 2042-11-18
Also published as: CN115812642A

Abstract

The application discloses a sea water fish desalination seedling method, which comprises the following steps: s100, treating the saline-alkali well water, wherein the treated saline-alkali well water can be used as water for cultivation, water for desalination and water for seedling raising respectively; s200, salinity adjustment is carried out on the cultivation water treated in the step S100, one part of the cultivation water is placed in a hatching pond, and the other part of the cultivation water is placed in a cement pond; s300, placing fertilized eggs of marine fishes in a hatching pond for hatching; s400, placing the hatched fries in a cement pond for early-stage cultivation; s500, carrying out desalination cultivation on the fries in the step S400; s600, selecting a proper pond, placing water for raising seedlings in the pond, and placing the desalted fish fries in the pond for cultivation; s700, when the fries grow to more than 30mm in the pond, the fries can be fished and sold; so as to realize the localization of the sea fish culture fries in inland saline-alkali water areas and improve the utilization efficiency of the saline-alkali soil and the saline-alkali water area.

Description

Sea water fish desalination seedling raising method

Technical Field

The application relates to the technical field of sea water fish desalination and seedling raising, in particular to a sea water fish desalination and seedling raising method.

Background

Sea fish, living in the sea, has better protein than poultry, livestock and freshwater fish, the poultry and livestock do not have unsaturated fatty acid, the freshwater fish has very low unsaturated fatty acid content, and the sea fish has rich unsaturated fatty acid, so the sea fish has higher nutritive value and economic value. However, in the prior art, the sea fish in the saline-alkali water area of the inland is cultivated by desalting and transporting fish fries and fish seeds to the inland target cultivation water area from the coastal production area in a long distance, but the cultivation has the following problems:

(1) The fish injury caused by the fish fry and fish species is unavoidable in the process of desalting, so that the culture survival rate is low, and the culture cost is increased; (2) The desalted fish fries are transported to inland saline-alkali water areas of the open sea in long distance, and the transportation process can cause damage to fish; the increase of the cost eventually leads to the increase of the whole cultivation cost, thereby restricting the development of the cultivation industry of the seawater fish in the saline-alkali soil of the inner land, and further restricting the application of the seawater fish desalination cultivation technology in the larger field by long-distance transportation.

Disclosure of Invention

In order to overcome the defects of the prior art, the application aims to provide the sea fish desalination seedling raising method which can raise the sea fish in inland saline-alkali water areas so as to realize the native raising of sea fish fries in inland saline-alkali water areas and improve the utilization efficiency of saline-alkali lands and saline-alkali water areas.

The application further aims to provide a sea fish desalination seedling method, so that the cultivation cost of inland sea fish cultivation is reduced, and people in inland areas far away from the sea can taste fresh sea water products.

In order to achieve the above purpose, the application adopts the following technical scheme: a sea fish desalination seedling method comprises the following steps:

S100, treating the saline-alkali well water, wherein the treated saline-alkali well water can be used as water for cultivation, water for desalination and water for seedling raising respectively;

s200, salinity adjustment is carried out on the cultivation water treated in the step S100, one part of the cultivation water is placed in a hatching pond, and the other part of the cultivation water is placed in a cement pond;

s300, placing fertilized eggs of marine fishes in a hatching pond for hatching;

s400, placing the hatched fries in a cement pond for early-stage cultivation;

s500, carrying out desalination cultivation on the fries in the step S400;

S600, selecting a proper pond, placing water for raising seedlings in the pond, and placing the desalted and cultivated fish fries in the pond for cultivation;

S700, when the fries grow to more than 30mm in the pond, the fries can be fished and sold.

Further, the salinity of the water for cultivating in the step S200 is 22-25 per mill, and the salinity of the water for raising the pond seedlings in the step S600 is not lower than 0.8 per mill.

Further, the incubating salinity in the incubating pond in the step S300 is 22-25%, the water temperature is 18-20 ℃, the pH value is 7.8-8.5, the dissolved oxygen amount is more than 5mg/L, and the ammonia nitrogen content is less than 0.1 mg/L.

Further, the fish fry is required to be fed with baits in the desalination cultivation process, wherein the baits comprise one or more of insect pulp, chlorella, rotifer, artemia nauplii and compound feeds.

Further, in the step S500, a plurality of salinity steps are arranged, the salinity of the desalted water of the first salinity step is 20-25 per mill, the salinity of the desalted water of the last salinity step is consistent with the salinity of the water for raising seedlings in the pond, the salinity difference between the salinity steps is 1-10 per mill, the sea water fries are kept in the desalted water of different salinity steps for 10-15 h, the desalination cultivation temperature is 18-25 ℃, the pH value in the desalination cultivation process is 7.5-8.5, the dissolved oxygen amount is more than 5mg/L, and the ammonia nitrogen content is less than 0.1 mg/L.

Further, in the step S500, the salinity of each salinity step is 20%o, 15%o, 10%o, 7.5%o, 5%o, 3%o, 2%o, 0.8%o.

Further, in the step S400, the fries are fed by the following method: fertilized eggs grow in a nutritional way within 4 days after membrane rupture by utilizing nutrition matters in yolk, when the fish fry after membrane rupture grow to 2mm, housefly adult pulp is firstly put in, and the dosage is 0.5-1 mg/L twice a day; then adding chlorella algae liquid to enable the number of chlorella in the water body in the pond to be 10-30 ten thousand/mL, and feeding the high-temperature cultivated small individual rotifers to enable the number of the small individual rotifers in the pond to be 3-5/mL; when the fish fry grows to 4mm, feeding rotifers so that the number of the rotifers in the pond is 5-10 mg/L, continuously throwing in adult fly pulp with the dosage of 0.5-1 mg/L, feeding three times a day, and continuously supplementing chlorella algae liquid so that the number of the chlorella in the pond is 10-30 ten thousand/mL; when the fish fry grows to 7mm, feeding artemia nauplii, so that the number of artemia nauplii in the pond is 0.5-1/mL, continuously feeding rotifers, so that the number of rotifers in the pond is kept at 10/mL, and feeding a small amount of compound feed, wherein the dosage of the compound feed is 1 mg/L-1.5 mg/L, and three times per day.

Further, the compound feed is prepared by mixing insect slurry and microparticles, and the mixing ratio of the insect slurry to the microparticles is 1:8.

Further, in the step S500, the fries are fed by: when the fish fry grows to 10mm, feeding the rotifers so that the number of the rotifers in the pool is 10 per mL; the artemia nauplii are fed, so that the number of artemia nauplii in the pool is 2-3/mL, the compound feed is fed for 4 times per day, and the dosage is 1 mg/L-1.5 mg/L each time.

Further, in the step S600, the fries are fed by: when the fish fry grows to 15mm, living baits such as the cladocera, the copepods, the insect larvae and the like cultured in the pond can be mixed with the compound feed for feeding.

Further, the method for treating the saline-alkali well water in the step S100 includes: firstly pumping underground saline-alkali well water into a sedimentation tank, exposing and insolating the saline-alkali well water in the sedimentation tank, aerating and heating the saline-alkali well water, and filtering the saline-alkali well water in the sedimentation tank through a cotton bag.

Further, the marine fish in the step S300 is selected from one of black sea bream, red fish in the united states and jewfish.

Further, in the step S300, the hatching pond has an area of 10m ²-20m² and a pond height of 1.0m-1.2m, and is required to be cleaned before use, and then is sprayed and disinfected by 30ppm-50ppm chlorine dioxide, and an air-dispersing stone is paved in the pond.

Further, the water depth in the hatching pond is 0.8 m-1.0 m, and the egg laying density is 3-6 ten thousand grains/m ³.

Furthermore, when the hatching pond is used for hatching fish eggs, direct sunlight needs to be avoided, water is still, micro-aeration is carried out, and water bloom is controlled to be slightly formed on the water surface during aeration.

Further, the top of the cement pond is covered with the black sunshade film, so that the illumination in the cement pond is controlled to be 500-1000Lx, direct sunlight is avoided, sudden strong light illumination is reduced as much as possible at night, micro-aeration is needed to be carried out on water in the cement pond at the beginning of cultivation, the aim of aeration is to improve water body dissolved oxygen, the aim of micro-aeration is that young fishes just beginning to come out of the film are tender and weak, if the young fishes are strongly aerated, the young fishes just coming out of the film can be injured, meanwhile, the strong aeration can influence eating of the fishes, and therefore, when the aeration is just beginning, the aeration quantity is 30cm in diameter of water surface water, and the aeration quantity can be gradually expanded to 40cm along with the growth of the young fishes.

Further, the pre-cultivation process needs to perform sewage suction treatment on the bottom of the pond, wherein the pre-cultivation is started to 7 days, water is still, sewage is sucked once a day, sewage is sucked twice a day after 7 days, water is required to be changed periodically, the water change amount is gradually increased from 20% -30% to 75%, and the water change temperature difference is not more than 2 ℃.

Further, the water temperature of the desalination cultivation water is 18-25 ℃, the pH value is 7.5-8.5, the dissolved oxygen amount is more than 5mg/L, and the ammonia nitrogen content is less than 0.1 mg/L.

Further, aeration is needed in the desalination cultivation process, and the aeration quantity is 40cm in diameter of water surface water spray.

Further, the bottom of the pool needs to be polluted every day in the desalination cultivation process, water needs to be changed in the pool after the pollution is sucked twice a day, the water amount is not more than 50% each time, the water amount is not more than 75% each day, and the temperature difference is not more than 2 ℃.

Furthermore, the saline-alkali water is required to be filtered through the cotton bag before being used as the cultivation water and the desalination water, and the cotton bag is filtered because the saline-alkali well water subjected to aeration and precipitation treatment contains silt with fine particles suspended, so that the saline-alkali well water can greatly influence the incubation, the early cultivation and the desalination cultivation processes, and the water is filtered through the cotton bag, so that the water is clean and fresh, and a series of subsequent operations are facilitated.

Further, the saline-alkali water needs to be subjected to serigraphy before being used as pond seedling water, specifically, the early stage of pond ecological seedling and pond washing water are subjected to serigraphy by using 80-mesh bags, the middle stage seedling is subjected to serigraphy by using 60-mesh bags, and the later stage is subjected to serigraphy by using 40-mesh bags.

Further, the pond selected in the cultivation process can be an outdoor traditional soil pond, and also can be an outdoor high-standard pond with cement hardening on the surrounding dykes and ponds, wherein the area of the pond is generally selected to be 0.1hm ²~0.3hm², the depth is 1-1.2 m, and the length is as follows: wide=1.5:1, and the middle can be drained. The bottom of the pond is provided with a bottom oxygenation facility and a waterwheel aerator, the bottom oxygenation power is more than 1.5kw/0.067hm ², two pond waterwheel aerators with the area of 0.1-hm-0.2 hm are arranged, four pond waterwheel aerators with the area of more than 0.2hm are arranged diagonally, four corners are arranged, and the aerator power is 0.75-1.5 kw/station.

Further, when the pond is used for ecological cultivation, if the pond is a traditional soil pond, the traditional soil pond can be thoroughly cleaned, and animal and plant dead body and remains, organic matter residues, enemy organisms and competing organisms in the sludge can be removed; if the cement-hardened outdoor high-standard pond is selected, the dam and the pond bottom are washed, and then the pond bottom is exposed to the sun in a dry mode, so that harmful inorganic matters at the pond bottom volatilize, and the oxidation-reduction potential of the pond bottom is improved. 20-30 days before the young fish leaves the pond, the pond needs to be disinfected by using 20-30kg/0.067hm ² of bleaching powder to kill most pathogenic microorganisms in the pond; 3-5 days after the bleaching powder is disinfected, and then improving the bottom of the pond by using 100kg/0.067hm ² of quicklime so as to ensure the stability of the bottom of the pond during seedling raising; and (3) water is fed after the quicklime is used for 3-5 days, the pond is soaked and washed, washing is continuously carried out twice, water is fed into the pond after washing, the water feeding depth reaches about 0.8m, and then living bait culture is carried out. Both the water for washing the pool and the water for raising the seedlings need to be screened by using 80-mesh bags.

Wherein, the specific operation of living bait culture on the pond is as follows: the method comprises the steps of adding chlorella algae liquid, amino acid, insect slurry, nitrogen, phosphorus, potassium, calcium, magnesium and other nutrient solutions and microelements in the morning of sunny days, taking cultivated cladocera, copepods, insect larvae and the like as baits for the later ecological cultivation of fish fries, and timely supplementing the pond with the amino acid, the insect slurry, the nitrogen, phosphorus, potassium, calcium, magnesium and other nutrient solutions and microelements when the total number of cladocera, copepods and insect larvae in the pond is less than 0.5/mL so that the total number of cladocera, copepods and insect larvae in the pond is maintained above 0.5/mL.

The fish fries are transferred into the pond for ecological cultivation in the pond, and the ecological cultivation in the pond can be divided into a first period of cultivation in the pond and a middle period of cultivation in the pond. The early-stage bait for pond cultivation takes living baits such as cladocera, copepods, insect larvae and the like cultured in the pond as main baits, and meanwhile, the living baits are supplemented with compound feeds mixed with insect pulp.

Wherein, the bait in the middle and later period of pond cultivation takes the compound feed mixed with the insect slurry as the main material, and takes living baits such as the cladocera, the copepods, the insect larvae and the like cultivated in the pond as the auxiliary material, and the quantity of the living baits is not required.

Wherein the density of the ecological cultivation in the pond is 1000-2000 tails/m ³, the salinity of the ecological cultivation in the pond is more than 0.8 per mill, the water temperature is more than 16 ℃, the pH value is 7.5-9.0, the dissolved oxygen amount is more than 5mg/L, and the ammonia nitrogen content is less than 0.5 mg/L.

In some embodiments, in the late cultivation process of the pond, when living baits are cultivated and the young fish just enters the pond, the bottom oxygenation is mainly adopted to oxygenate the pond, the middle and late stage mainly adopts the three-dimensional oxygenation modes of the bottom oxygenation and the waterwheel oxygenation, and thermocline and dissolved oxygen dead angles can be effectively eliminated through the combination of the two modes. When the fish fry in the pond is required to be fed, the waterwheel aerator is required to be turned off 0.5h before feeding, so that the feed is prevented from being wasted along with water flow drifting and the feeding of the fish fry is prevented from being influenced due to unfixed fixed point positions, and the growth and uniformity of the fish fry are further influenced.

In some embodiments, in the pond cultivation process, only water is filled into the pond without water within 5 days after the fries enter the pond, sewage is required to be discharged twice a day in the middle and later cultivation, water is required to be changed after sewage is discharged, and the water amount of each water change is 20% -30% of the total water amount.

In some embodiments, the size of the fries placed in the pond is required, and the specific requirements are: when fertilized eggs are subjected to membrane rupture for 25 days and desalination cultivation for 5 days, the total length of the fries reaches 15mm, and when the fries develop into the later period of young fish and begin to enter the period of young fish, most of the fries become deep in color and mainly move on the lower layer of a water body, and when the water temperature in a pond is above 18 ℃ and the total number of branch angles, copepods and insect larvae is above 0.5/mL, the fries can be moved into the pond for ecological cultivation in sunny morning and windless morning.

When bait is fed in the pond, different baits are generally fed according to different periods. The method comprises the following steps: when the fish fry just moves into the pond for early-stage cultivation, the bait is mainly living bait such as branch horns, copepods, insect larvae and the like cultivated in the pond, and the total quantity of the branch horns, copepods and insect larvae in the pond is required to be more than 0.5/mL; meanwhile, the compound feed mixed with the insect slurry is also used for feeding, and the aim of selecting the compound feed mixed with the insect slurry is to: firstly, the deficiency of the natural bait can be supplemented or the normal feeding of the fries without the natural bait can be ensured; secondly, the training of timing and fixed points can be carried out on the fries, and the training device is a base of conditioned reflex with the fed compound feed as a main size in the middle and later period cultivation process, so that the fries can adapt to the fed compound feed. When the fish fry is cultivated in the middle and later period in the pond, the compound feed mixed with the insect slurry is mainly used, and living baits such as the cladocera, the copepods, the insect larvae and the like cultivated in the pond are supplemented, but the quantity of the living baits is not required at the moment.

In some embodiments, when the fries in the pond are fed, the compound feed mixed with the insect slurry is generally required to be fed twice every day, namely after sunrise in the morning and before sunset in the evening; and the waterwheel aerator is required to be turned off 0.5h before feeding, a small amount of feed is firstly fed, after a large number of fries are clustered, the feed is fed quickly, the feed is fed in a dispersing manner as much as possible in the feeding process, and when the number of fed fries begins to decrease, the feed is fed slowly, and the whole feeding time is generally 0.5-1 h. And when the compound feed is fed in the early-stage cultivation process of the pond, the compound feed is generally uniformly mixed with water and then is sprayed, so that the compound feed can be dispersed and uniform, and the compound feed in the later stage can be directly fed without mixing water.

Compared with the prior art, the application has the beneficial effects that:

(1) The application is suitable for fish breeding and breeding units, solves the problem that the sea fish fry can not be produced in fresh water areas in the prior art, realizes the localization of sea fish breeding fry in inland saline-alkali water areas, reduces the breeding cost and further enlarges the breeding area of sea fish in inland.

(2) The application utilizes fertilized eggs of sea fish to be transported to a seedling raising factory in inland areas, and the low-salinity saline-alkali well water is used for adjusting and treating the salinity and the like of water for sea fish cultivation, the living bait for the early-stage cultivation of sea fish fries in a cement pond and the nutritional artificial bait are organically matched, the early-stage cultivation of sea fish fries in the cement pond, the desalination cultivation of sea fish fries in the cement pond comprise desalination time selection, desalination time regulation, desalination water treatment and the like, the ecological cultivation of sea fish fries in the pond, the cultivation of natural living bait and the reasonable use of artificial compound feed.

(3) According to the application, by carrying out native cultivation on the sea fish fries, the problems that sea fish fries are easy to damage due to long-distance transportation, and inland cultivation cost is increased due to the fact that the fry prices are increased in the prior art can be effectively solved, so that the development of sea fish in inland saline-alkali soil cultivation industry is restricted.

(4) According to the application, the cultivation cost can be effectively reduced by cultivating seawater fishes on inland in the fertilized egg stage, meanwhile, the seawater fish cultivation is applied to the saline-alkali soil, the agriculture synergism of the saline-alkali soil and the saline-alkali water area can be effectively promoted, the income of farmers is increased, and the living quality of local fishermen is also improved, so that people far away from the ocean inland area can eat fresh seawater fishes, and a new cultivation space and sales space are developed for the cultivation of seawater products.

Drawings

FIG. 1 is a flow chart of a seawater fish desalination seedling method in the application.

Detailed Description

The present application will be further described with reference to the following specific embodiments, and it should be noted that, on the premise of no conflict, new embodiments may be formed by any combination of the embodiments or technical features described below.

In the description of the present application, it should be noted that, for the azimuth words such as terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present application and simplifying the description, and it is not to be construed as limiting the specific scope of protection of the present application that the device or element referred to must have a specific azimuth configuration and operation.

It should be noted that the terms "first," "second," and the like in the description and in the claims are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

The terms "comprises" and "comprising," along with any variations thereof, in the description and claims, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The inventor of the application provides that the fries of the seawater fish can be cultivated in inland saline-alkali water areas, so that the native culture of the seawater fish fries in inland saline-alkali water areas is realized.

Furthermore, the inventor of the application proposes that fertilized eggs of sea fish such as black sea bream are transported to a inland area seedling raising factory to regulate a seedling raising water body, then hatching, early-stage cultivation, desalination cultivation and later-stage ecological seedling raising are carried out in a pond, so that the problem that the fish fries of sea fish in the prior art cannot be directly bred in inland low-salinity saline-alkali water areas is effectively solved, the cultivation requirements of the sea fish in the inland saline-alkali water areas are ensured, the cultivation cost is reduced, and the cultivation area of the sea fish in the inland is further enlarged.

Further, saline-alkali soil refers to land containing more salt, and at present, commercial crops such as wheat, barley, corn and peanut can only be planted, and because the salt content of the land of the type is more, the land is unfavorable for the growth of plants, so that the crop yield and the economic benefit of the saline-alkali soil planting in the prior art are low, and the low-lying saline-alkali water area in the prior art can only generally culture freshwater fishes such as silver carp, bighead carp, green grass and the like with lower economic value, and the cultivation is extensive, the technical tradition and low benefit is achieved, so that the enthusiasm of practitioners is low. The inventor of the application puts the fish fry of seawater fish into inland saline-alkali water areas directly for cultivation, can enrich fishery resources in the middle and western regions, greatly supplements market supply of aquatic products such as fishes in the inland river forbidding period in the middle and western regions, enables the development of fresh seafood market from coastal to inland, enables people in the inland region far away from sea to taste fresh seawater products, promotes the mutual and complementary aquaculture in the coastal region and the middle and western regions, and also can develop new cultivation space and sales market for the aquatic product cultivation in the coastal region, thus becoming an important way for promoting the cooperative high-quality internal circulation development in the east and west of fishery economy in China. Therefore, the sea fish desalination seedling method effectively promotes the agriculture synergy of the saline-alkali soil and the saline-alkali water area, increases the income of farmers, improves the living quality of local farmers and fishermen, and creates a new chapter of sea fish artificial cultivation.

Specifically, in one embodiment of the application, a method for desalting sea fish fries is provided, and the method for desalting sea fish fries comprises the following steps:

s300, placing fertilized eggs of marine fishes in a hatching pond for hatching;

s400, placing the hatched fries in a cement pond for early-stage cultivation;

s500, carrying out desalination cultivation on the fries in the step S400;

s600, selecting a proper pond, placing water for raising seedlings in the pond, and placing the lightly cultivated fish fries in the pond for cultivation;

The saline-alkali well water in step S100 is generally several tens or hundreds of meters deep underground, and has very low dissolved oxygen and very low water temperature, and simultaneously contains silt, unfavorable heavy metal elements in the process of raising seedlings of marine fishes, so that when the saline-alkali well water is treated, the saline-alkali well water needs to be pumped into a sedimentation tank, and then is subjected to exposure, insolation, aeration, temperature rise and other treatments, so that the heavy metal elements possibly contained in the saline-alkali well water are oxidized, the silt is precipitated, the water body is oxygenated, the temperature is raised, and the like. The saline-alkali well water subjected to aeration and precipitation post-treatment also contains silt with fine particles suspended, and the saline-alkali well water has great influence on the hatching of fertilized eggs, the early-stage cultivation of fish fries and the desalination cultivation process of fish fries, so that the saline-alkali well water needs to be filtered through a cotton bag before use, and the water body of the saline-alkali well water becomes clean and fresh; the saline-alkali well water filtered by the cotton bag can be placed in a dark reservoir, and the purpose of placing the dark reservoir is mainly to prevent natural algae generated by cultivation water and desalination water from influencing water quality due to sunlight irradiation.

Wherein the salinity of the water for cultivating in the step S200 is 22-25 per mill, and the salinity of the water for cultivating the pond in the step S600 is not lower than 0.8 per mill.

Wherein, the hatching salinity in the hatching pond in the step S300 is 22 to 25 per mill, the water temperature is 18 to 20 ℃, the pH value is 7.8 to 8.5, the dissolved oxygen amount is more than 5mg/L, and the ammonia nitrogen content is less than 0.1 mg/L.

Wherein, the pH value in the hatching pond can be adjusted by the following ways: normally, the pH value of the water for cultivation is about 8, and the pH value of the water for cultivation changes with the progress of the breeding of the seedlings, and when the pH value of the water for cultivation is higher, a proper amount of microbial preparations such as bacillus, lactobacillus and the like can be added for adjustment, or lactic acid can be used for adjustment, and when the pH value of the seawater is lower, a microbial preparation such as chlorella, photosynthetic bacteria and the like can be added for adjustment, or sodium bicarbonate can be used for adjustment.

In the actual operation process, in order to keep the water quality in the hatching pond fresh, dirt, dead eggs and the like in the hatching pond need to be cleaned every day.

Wherein, when the hatched fries enter a cement pond for early-stage cultivation, the density is determined by the hatching rate of fertilized eggs. The eggs produced by female fishes are not necessarily fertilized, only fertilized eggs can be called fertilized eggs, the fertilized rate of the eggs is different according to the types, environments and the like of sea water fishes, wherein the fertilized rate of the artificial fertilization mode is higher than that of the natural fertilization mode, and the fertilized rate of the common artificial fertilization mode is 60% -85%; the hatching rate of fertilized eggs is greatly different due to the influence of environmental factors such as temperature, salinity and the like, artificial breeding technology and the like, so that in the actual process, the fish fries hatched in the hatching pond are required to be merged or divided according to the hatching rate of fertilized eggs.

In some embodiments pooling may be performed when the fertilized egg hatchability is below 25% or the fry density is below 1 ten thousand feet/m ³ and pooling may be performed when the fertilized egg hatchability is above 90% or the fry density is above 4 ten thousand feet/m ³.

In some embodiments, the black sea bream is selected for desalination and seedling raising, the temperature in the hatching pond is preferably more than 14 ℃, because fertilized eggs of the black sea bream can be hatched at the water temperature of more than 14 ℃, the initially hatched fish can also carry out exogenous nutrition at the water temperature of more than 14 ℃, when the water temperature of a seedling raising field to be raised on inland is higher than 14 ℃, the fertilized eggs of the black sea bream can be collected and then transported to the seedling raising field to be raised on inland at low temperature for desalination and seedling raising operation.

In some embodiments, the hatching temperature of the American red fish fertilized eggs is 22-30 ℃, the salinity is 28-35 per mill, the pH value is 7.8-8.5, the dissolved oxygen amount is more than 3mg/L, and the ammonia nitrogen content is less than 0.5 mg/L.

In other embodiments, the fertilized eggs of the micropterus salmoides have a hatching temperature of 16-24 ℃, a salinity of 31-34 per mill, a PH value of 7.5-8.6, a dissolved oxygen amount of more than 5mg/L and an ammonia nitrogen content of less than 0.1 mg/L.

Wherein, the fish fry is required to be fed with bait in the desalination cultivation process, and the bait comprises one or more of maggot, chlorella, rotifer, artemia nauplii and compound feed.

The main components of the adult fly slurry are small molecular peptides, but the adult fly slurry also comprises digestive enzymes, saccharomycetes, probiotics, polypeptide particles and the like, and is excellent bait for opening newly hatched fries (namely initially hatched fries), so that the immunity of the fries can be enhanced, the growth is promoted, and the breeding rate is improved; meanwhile, the housefly adult pulp is a nutrient solution of chlorella and rotifer, and has obvious effects of amplifying the number of the chlorella and strengthening the cultivation of the rotifer, so that the housefly adult pulp needs to be put in the actual feeding process; on one hand, the chlorella can adjust the water color in the pond in the seedling raising process, can be used as auxiliary bait for the opening of the initially hatched larva fish and can also be used as a main nutrition source for the nutrition enhancement of the rotifer, so that the chlorella needs to be put after the adult fly pulp is put; the rotifer is the most main living bait in the early-stage cultivation process of the fries in the cement pond, and is fed after being fed with adult fly pulp and chlorella, and the rotifer is fed finally. The feeding time among the three is not strictly time interval, but in the actual operation process, the feeding time interval between the two is generally preferably 1-2 h.

The young fish just opened has small crack and weak predatory capacity, so that the small individual rotifers cultivated at high temperature are required to be used as the initial baits, and the adult rotifers of the houseflies and the chlorella are used as the supplementary initial baits, so that the adult rotifers of the houseflies and the chlorella can be subjected to nutrition enhancement. After 3-5 days of opening, the larva fish passes through the opening stage, the upper and lower jaws of the larva fish are basically developed and perfect, and special requirements on the rotifer individuals are not required.

Wherein, in the step S500, a plurality of salinity steps are arranged, the salinity of the desalted water of the first salinity step is 20-25 per mill, the salinity of the desalted water of the last salinity step is consistent with the salinity of the water for raising seedlings in the pond, the salinity difference value between each salinity step is 1-10 per mill, the sea water fries are kept in the desalted water of different salinity steps for 10-15 h, the desalination cultivation temperature is 18-25 ℃, the pH value in the desalination cultivation process is 7.5-8.5, the dissolved oxygen amount is more than 5mg/L, and the ammonia nitrogen content is less than 0.1 mg/L.

Wherein, the salinity of each salinity step in the step S500 is 20%o, 15%o, 10%o, 7.5%o, 5%o, 3%o, 2%o and 0.8%o.

The sea water fish fry is characterized in that two ways are provided for regulating the intracellular osmotic pressure and the external environment osmotic pressure during desalination, one way is that the sea water fish fry is balanced by cell deformation and volume expansion, and is stressed, if the cell physiological damage and irrecoverability are caused by the overlarge osmotic pressure difference between the cell inner environment and the cell outer environment, the sea water fish fry is represented as death, so that the salinity reduction amplitude during desalination cultivation operation is controlled within a safe cell deformation range; the other is to balance the transportation of substances inside and outside the cell by utilizing ions such as potassium, sodium, calcium, magnesium and copper through cell membranes, but a certain time and a certain process are needed to balance and adapt to the transportation, so that the two principles are needed for desalting sea fish fries such as black sea bream and the like, the two principles are simultaneously and scientifically utilized, the second way is fully utilized to balance the osmotic pressure inside the cell with the external environment within the safe cell deformation range, and then the external environment with the osmotic pressure reduced is adapted. That is, it is required to balance the osmotic pressure inside and outside the cells before the cell physiology is damaged but can recover, and adapt the sea fish fries such as black sea bream to the water environment after the osmotic pressure is reduced, which is shown that the sea fish fries such as black sea bream are successfully desalted and cultivated, and then the next desalting operation after the salinity is reduced is performed until the salinity reaches the salinity of the water for late-stage seedling raising in the pond. The total requirement is that the salinity is not reduced too much, otherwise the osmotic pressure difference between the inside and outside of the cell is too great, so that the cell is physiologically destroyed and cannot be recovered, and the desalination cultivation is failed.

In some embodiments, the density of the fish fries cultivated in the cement pond in the early stage is determined by the survival rate of the fish fries cultivated in the early stage when the fish fries enter the cement pond for desalination cultivation. The survival rate in the early cultivation process can be greatly different due to the influence of environmental factors such as temperature, salinity and the like, artificial seedling technology and the like, and sometimes even the situation that the survival rate is zero can occur. Therefore, in the actual desalination and seedling raising process, the fries can be pooled or separated according to the survival rate in the early stage cultivation process. When the survival rate of the fries in the current period of cultivation is lower than 15 percent or the density of the fries is lower than 0.35 ten thousand tails/m ³, the fries can be pooled; when the survival rate of the current period cultivation is higher than 60 percent or the fry density is higher than 1.5 ten thousand tails/m ³, the pond separation can be carried out.

In some embodiments, the survival rate of black sea bream, seven-star weever and American red fish in the early stage cultivation process is generally 45% -70%.

In the step S400, the fries are fed by the following method: the eggs grow in a nutritional way within 4 days after membrane rupture by utilizing nutrition matters in yolk, when the fish fries grow to 2mm after membrane rupture, housefly adult pulp is firstly put in, and the dosage is 0.5-1 mg/L twice a day; then adding chlorella algae liquid to enable the number of chlorella in the water body in the pond to be 10-30 ten thousand/mL, and feeding the high-temperature cultivated small individual rotifers to enable the number of the small individual rotifers in the pond to be 3-5/mL; when the fish fry grows to 4mm, feeding rotifers so that the number of the rotifers in the pond is 5-10 mg/L, continuously throwing in adult fly pulp with the dosage of 0.5-1 mg/L, feeding three times a day, and continuously supplementing chlorella algae liquid so that the number of the chlorella in the pond is 10-30 ten thousand/mL; when the fish fry grows to 7mm, feeding artemia nauplii, so that the number of artemia nauplii in the pond is 0.5-1/mL, continuously feeding rotifers, so that the number of rotifers in the pond is kept at 10/mL, and feeding a small amount of compound feed, wherein the dosage of the compound feed is 1-1.5 mg/L, and three times per day.

Wherein the compound feed is prepared by mixing insect slurry and microparticles, and the mixing ratio of the insect slurry to the microparticles is 1:8. The purpose of selecting the ratio of 1:8 is that the insect slurry and the microparticles can be uniformly mixed under the ratio, if the ratio of the insect slurry is too low, the compound feed is difficult to uniformly mix, so that part of the compound feed cannot adhere to the insect slurry and the nutrient absorption of fish is affected; when the proportion of the insect slurry is too high, the quality of the mixed feed can be influenced due to too wet after the mixed feed is mixed.

Further, in step S500, the fries are fed by: when the fish fry grows to 10mm, feeding the rotifers so that the number of the rotifers in the pool is 10 per mL; the artemia nauplii are fed, so that the number of artemia nauplii in the pool is 2-3/mL, the compound feed is fed for 4 times per day, and the dosage is 1 mg/L-1.5 mg/L each time.

Further, in step S600, the fries are fed by: when the fish fry grows to 15mm, living baits such as the cladocera, the copepods, the insect larvae and the like cultured in the pond can be mixed with the compound feed for feeding.

Further, the method for treating the saline-alkali well water in the step S100 comprises the following steps: firstly pumping underground saline-alkali well water into a sedimentation tank, exposing and insolating the saline-alkali well water in the sedimentation tank, performing aeration and heating treatment, and filtering the saline-alkali well water in the sedimentation tank through a cotton bag.

Further, the marine fish in step S300 is selected from one of black sea bream, red fish in the united states, and jewfish.

Further, in the step S300, the hatching pond is 10m ²~20m² in area and 1.0-1.2 m in pond height, the hatching pond needs to be cleaned before use, chlorine dioxide of 30-50 ppm is used for spraying and sterilizing the whole pond, and an air dispersing stone is paved in the pond, so that the purpose of paving the air dispersing stone is to increase dissolved oxygen in a water body in the hatching pond, because the air dispersing stone has a special structure, the filled air can be fully atomized through the air dispersing stone, and the atomized air can be dispersed and filled into the water body, so that oxygenation can be carried out in the water body.

Furthermore, the hatching pond needs to avoid direct sunlight, still water and micro-aeration when hatching fertilized eggs, and the micro-water spray is controlled on the water surface when aerating.

Further, the top of the cement pond is covered with the black sunshade film to ensure that the illumination in the cement pond is controlled at 500-1000Lx, so as to avoid direct sunlight, and simultaneously, the sudden strong light illumination is reduced as much as possible at night, and at the beginning of cultivation, the water body needs to be micro-inflated, the purpose of inflation is to improve the dissolved oxygen of the seedling raising water body, and at the beginning of the micro-inflation is to ensure that the young fish which just begins to come out of the film is tender and weak, if the young fish is strongly inflated, the young fish which just comes out of the film can be injured, and meanwhile, the strong inflation can influence the eating of the fish, so that the inflation amount is 30cm of the diameter of water surface water bloom at the beginning of inflation, and the inflation amount can be gradually enlarged to 40cm along with the growth of the young fish.

Further, the soil pick-up treatment is required to be carried out on the bottom of the cement pond in the early cultivation process, wherein the soil pick-up is carried out once a day from the beginning of the early cultivation to 7 days, the soil pick-up is carried out twice a day after 7 days, the water change is required to be carried out periodically, the water change amount is gradually increased to 75% from 20% -30%, and the water change temperature difference is not more than 2 ℃.

Further, the water temperature of the desalination water is 18-25 ℃, the pH value is 7.5-8.5, the dissolved oxygen amount is more than 5mg/L, and the ammonia nitrogen content is less than 0.1 mg/L.

Further, in the desalination cultivation process, the desalination water needs to be inflated, and the inflation quantity is 40cm in diameter of water surface water spray.

Further, the bottom of the pool needs to be polluted every day in the desalination cultivation process, water needs to be changed after the pollution is sucked twice a day, the water amount is not more than 50% each time, the water amount is not more than 75% each day, and the temperature difference is not more than 2 ℃.

Further, the saline-alkali well water is required to be filtered through the cotton bag before being used as the cultivation water and the desalination water, and the cotton bag is used for filtering because the saline-alkali well water subjected to aeration and precipitation treatment contains silt with fine particles suspended, so that the saline-alkali well water can greatly influence the incubation, the early cultivation and the desalination cultivation processes, and the water is filtered through the cotton bag, so that the water is clean and fresh, and a series of subsequent operations are facilitated.

Further, the saline-alkali well water needs to be subjected to serigraphy before being used as water for fish fries, specifically, 80-mesh bags are used for early stage and pond washing water for ecological breeding of the pond, 60-mesh bags are used for medium-stage breeding, and 40-mesh bags are used for later stage.

Further, the pond selected in the cultivation process can be an outdoor traditional soil pond, and also can be an outdoor high-standard pond with cement hardening on the surrounding dykes and ponds, wherein the area of the pond is generally selected to be 0.1hm ²~0.3hm², the depth is 1-1.2 m, and the length is as follows: wide=1.5:1, and the middle can be drained. The pool is provided with a bottom oxygenation facility and a waterwheel aerator, the bottom oxygenation power is more than 1.5kw/0.067hm ², the pool area is 0.1-0.2hm ², two waterwheel aerators are arranged, the two waterwheel aerators are arranged diagonally, when the pool area is more than 0.2hm ², four waterwheel aerators are arranged at four corners, and the waterwheel aerator power is 0.75-1.5 kw/table.

Further, when the pond is used for ecological cultivation, if the pond is a traditional soil pond, the traditional soil pond can be thoroughly cleaned, and animal and plant dead body and remains, organic matter residues, enemy organisms and competing organisms in the sludge can be removed; if the cement-hardened outdoor high-standard pond is selected, washing the dykes and the pond bottom; and then the pond bottom is exposed to the sun in a dry way, so that harmful inorganic matters at the pond bottom volatilize, and the oxidation-reduction potential of the pond bottom is improved. When the fish fry is 20-30 days before leaving the pond, the pond needs to be disinfected by using 20-30kg/0.067hm ² of bleaching powder to kill most pathogenic microorganisms in the pond; after 3-5 days after the disinfection of the bleaching powder is finished, improving the bottom of the pond by using 100kg/0.067hm ² of quicklime so as to ensure the stability of the bottom of the pond during seedling raising; and (3) water is fed after the quicklime is used for 3-5 days, the pond is soaked and washed, washing is continuously carried out twice, water is fed into the pond after washing, the water is filtered by using 80-mesh bags, the water feeding depth reaches about 0.8m, and living bait culture is carried out.

Wherein, the specific operation of living bait culture on the pond is as follows: the method comprises the steps of adding chlorella algae liquid, amino acid, insect slurry, nitrogen, phosphorus, potassium, calcium, magnesium and other nutrient solutions and microelements in the morning of sunny days, taking cultivated cladocera, copepods, insect larvae and the like as baits for fish fry later-stage cultivation, and timely supplementing the pond with the amino acid, the insect slurry, the nitrogen, phosphorus, potassium, calcium, magnesium and other nutrient solutions and microelements when the total number of cladocera, copepods and insect larvae in the pond is less than 0.5/mL so that the total number of cladocera, copepods and insect larvae in the pond is maintained above 0.5/mL.

Wherein, when the pond is cultivated, the cultivation is generally divided into the early cultivation of the pond and the middle and later cultivation of the pond.

Wherein, during the later cultivation in the pond, the fish fry is mainly mixed feed, and the quantity of the branch and horn species and the copepods is not required at this time.

Wherein the density of the post-cultivation of the pond is 1000-2000 tails/m ³, the salinity of the post-cultivation of the pond is more than 0.8 per mill, the water temperature is more than 16 ℃, the pH value is 7.5-9.0, the dissolved oxygen amount is more than 5mg/L, and the ammonia nitrogen content is less than 0.5 mg/L.

In some embodiments, in the late cultivation process of the pond, when living baits are cultivated and the young fish just enters the pond, the bottom oxygenation is mainly adopted to oxygenate the water body in the pond, the middle and late stage are mainly based on the bottom oxygenation and the water-vehicle oxygenation three-dimensional oxygenation mode, and thermocline and dissolved oxygen dead angle can be effectively eliminated through the combination of the two modes. When the fish fry in the pond is required to be fed, the waterwheel aerator is required to be turned off 0.5h before feeding, so that the feed is prevented from being wasted along with water flow drifting and the feeding of the fish fry is prevented from being influenced due to unfixed fixed point positions, and the growth and uniformity of the fish fry are further influenced.

In some embodiments, in the pond seedling raising process, only water is filled into the pond without water within 5 days after the fries enter the pond, sewage is required to be discharged from the pond in the middle and later period of cultivation, water is required to be changed after the sewage is discharged twice a day, and the water amount of each water change is 20% -30% of the total water amount.

When bait is fed in the pond, different baits are generally fed according to different periods. The method comprises the following steps: when the fish fry just moves into the pond for early-stage cultivation, the bait is mainly living bait such as branch horns, copepods, insect larvae and the like cultivated in the pond, and the total quantity of the branch horns, copepods and insect larvae in the pond is required to be more than 0.5/mL; meanwhile, the compound feed mixed with the insect slurry is also used for feeding, and the aim of selecting the compound feed mixed with the insect slurry is to: firstly, the deficiency of the natural bait can be supplemented or the normal feeding of the fries without the natural bait can be ensured; secondly, the training of timing and fixed points can be carried out on the fries, and a conditional reflex foundation is laid for taking the feeding compound feed as a main material in the middle and later period cultivation process, so that the fries can adapt to the feeding compound feed. When the fish fry is cultivated in the middle and later period in the pond, the compound feed mixed with the insect slurry is mainly used, and living baits such as the cladocera, the copepods, the insect larvae and the like cultivated in the pond are supplemented, but the quantity of the living baits is not required at the moment.

In some embodiments, when the fries in the pond are fed, the compound feed mixed with the insect slurry is generally required to be fed twice every day, namely after sunrise in the morning and before sunset in the evening; and the waterwheel aerator is required to be turned off 0.5h before feeding, a small amount of feed is sprayed, after a large number of fries are clustered, the feed is fed quickly, the feed is scattered as much as possible in the feeding process, and the whole feeding time is generally 0.5-1 h after the fed fries begin to decrease. And when the compound feed is fed in the early-stage cultivation process of the pond, the compound feed is generally uniformly mixed with water and then is sprayed, so that the compound feed can be dispersed and uniform, and the compound feed in the later stage can be directly fed without mixing water.

When the fertilized eggs are subjected to membrane-out first-stage cultivation in a cement pond for about 20 days, then subjected to desalination cultivation in a cement pond for about 5 days, and then transferred into an outdoor pond for 25 days, so that the first-stage hatched fries can grow to fries of fries above 30mm, and the fries in the pond can be fished and sold at the moment.

Wherein, table 1 shows the growth conditions of 20 fish fries at different time points in the application.

Wherein, table 2 shows the kinds of baits fed to the marine fish at each stage in the desalination and seedling process.

Example 1

A black sea bream desalination seedling method comprises the following steps:

(1) Pumping underground saline-alkali well water with the depth of tens of meters or even hundreds of meters into a sedimentation tank, exposing and insolating the underground saline-alkali well water in the sedimentation tank, performing treatments such as aeration heating and the like on the underground saline-alkali well water, and putting the treated saline-alkali well water into a dark reservoir, wherein the saline-alkali well water in the dark reservoir can be respectively used as cultivation water and desalination water;

(2) The saline-alkali inlet water treated in the step S100 is required to be filtered before being used as cultivation water, the filtered saline-alkali inlet water can be used as cultivation water, then the salinity of the saline-alkali well water is regulated to be controlled between 22% and 25%, one part of the saline-alkali well water is placed in a hatching pond, and the other part of the saline-alkali well water is placed in a cement pond;

(3) Cleaning and sterilizing the hatching pond, and then placing the fertilized eggs of the black sea bream into the hatching pond for hatching;

(4) Placing the hatched black sea bream fries in a cement pond for early cultivation, wherein different kinds of baits with different amounts need to be fed according to the sizes of the fries in the early cultivation process, and the method specifically comprises the following steps: fertilized eggs grow in a nutritional way within 4 days after membrane rupture by utilizing nutrition matters in yolk, when the fish fry after membrane rupture grow to 2mm, housefly adult pulp is firstly put in, and the dosage is 0.8mg/L twice a day; then adding chlorella algae liquid to ensure that the number of chlorella in the water body in the pond is 20 ten thousand per mL, and then feeding the high-temperature cultivated small-individual rotifers to ensure that the number of the small-individual rotifers in the pond is 4 per mL; when the fish fry grows to 4mm, feeding rotifers so that the number of the rotifers in the pond is 7mg/L, continuously feeding adult fly pulp of houseflies with the dosage of 0.8mg/L, feeding three times a day, and continuously supplementing chlorella algae liquid so that the number of the chlorella in the pond is 20 ten thousand/mL; when the fish fry grows to 7mm, the artemia nauplii are fed, so that the number of artemia nauplii in the pool is 0.8/mL, the artemia nauplii are fed continuously, the number of artemia in the pool is kept at 10/mL, and the mixed feed is fed in a small amount, wherein the dosage of the mixed feed is 1.3mg/L and is three times per day.

(5) Desalting and cultivating the young black porgy cultivated in the earlier stage in the step (4), wherein the desalting time is selected to enter the young fish stage after 20 days, and the desalting and cultivating specifically comprises the following steps: on the first day of desalination, adding desalinated water into a cement pond to enable the salinity in the cement pond to be reduced to 15 permillage from 20 permillage, and adding the desalinated water after 12 hours to enable the salinity in the cement pond to be reduced to 10 permillage; the next day of desalination, adding desalinated water into the cement pond to reduce the salinity in the cement pond from 10 permillage to 7.5 permillage in the last day, and adding the desalinated water after 12 hours to reduce the salinity in the cement pond to 5 permillage; the third day of desalination, adding desalinated water into the cement pond to enable the salinity in the cement pond to be reduced to 3 per mill from 5 per mill in the last day, and adding the desalinated water to enable the salinity in the cement pond to be reduced to 2 per mill after 12 hours; and (3) desalting for the fourth day, adding desalted water into the cement pond, so that the salinity in the cement pond is reduced from 2 per mill of the last day to the salinity of water for later-stage seedling culture of the pond, namely, the salinity is more than 0.8 per mill, and carrying out desalting culture.

(6) In the desalting process, the desalting time of the fries of the black sea bream is selected to enter the stage of young fish to carry out desalting cultivation after the fries grow for 20 days, and at the moment, the total length of the fries reaches about 10mm, and the fries begin to be phosphated. Feeding the artemia in the desalination cultivation process, so that the number of the artemia in the water body in the pond is kept at 10/mL, and feeding artemia nauplii, so that the number of the artemia nauplii in the water body in the pond is kept at 3/mL; the micro-particle compound feed mixed with the insect slurry is fed for 4 times per day with the dosage of 1.2 mg/L.

(7) Selecting a proper pond, cleaning the pond, placing water for raising seedlings in the pond, culturing living baits in the pond, and placing desalted and cultured black porgy fries in the pond for culturing;

(8) Bait feeding is needed to be carried out on the fries in the pond, and the specific operation is as follows: when the fries are transferred into the pond for ecological cultivation, the living baits such as the branch horns, the copepods, the insect larvae and the like cultivated in the pond are used as main baits in the early stage of the cultivation of the pond, and the total quantity of the branch horns, the copepods and the insect larvae in the pond is required to be more than 0.5/mL; meanwhile, the compound feed mixed with the insect slurry is fed, so that the natural bait is not enough or the fish fries can be guaranteed to eat when the natural bait is not eaten, and the timing and fixed-point training is carried out on the fish fries, so that a basis for conditional reflection is laid for taking the feed as a main material in the middle and later stages. The bait for the middle and later period of pond cultivation is mainly mixed with compound feed mixed with insect pulp, and is supplemented with living baits such as cladocera, copepods, insect larvae and the like cultivated in the pond, wherein the quantity of the living baits is not required. Wherein, the compound feed mixed with the insect slurry is fed twice in the day, which is respectively after sunrise in the morning and before sunset in the evening. The automatic aerator is characterized in that a small amount of feed is sprayed before feeding for 0.5h Guan Shuiche h, after a large amount of fries are clustered, the feed is fed quickly, the feed is fed in a dispersed manner as far as possible, the quantity of fries entering a feeding table begins to be reduced, the feed is fed slowly, and the whole feeding time is required to reach 0.8h. When the compound feed is fed, the feed can be dispersed and evenly by mixing water and splashing, and the feed can be fed without mixing water in the later period.

(9) When the fries of the black sea bream grow to more than 30mm in the pond, the fries can be fished and sold.

Example 2

The sea fish desalination and seedling method in embodiment 2 is the same as embodiment 1, except that the sea fish species for desalination and seedling is seven-star weever.

Example 3

The sea fish desalination and breeding method in the embodiment 3 is the same as the embodiment 1, except that the sea fish species for desalination and breeding is sciaenops ocellatus.

The hatchability of fertilized eggs of different kinds of marine fish in examples 1 to 3 is shown in table 1 below.

Wherein, fertilized eggs of the sea fish selected in each group of examples 1 to 3 are 50 ten thousand.

Wherein the hatching rate of fertilized eggs is the number of fish fries after hatching divided by the total number of fertilized eggs.

From examples 1 to 3, the hatchability of fertilized eggs of different kinds of sea fish was different under the same conditions.

Examples 1 to 3 are the survival rates of the fries of different kinds of marine fish in the early stage cultivation process as shown in table 2 below.

Wherein, the number of different kinds of sea water fries selected in each group of examples 1-3 and put into a cement pond for early cultivation is 20 ten thousand respectively.

Wherein the survival rate of the fries in the early stage cultivation process is the number of the fries which survive in the early stage cultivation process divided by the total number of the fries put into a cement pond for the early stage cultivation.

The foregoing has outlined the basic principles, features, and advantages of the present application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present application, and various changes and modifications may be made therein without departing from the spirit and scope of the application, which is defined by the appended claims. The scope of the application is defined by the appended claims and equivalents thereof.

Claims

1. A sea fish desalination seedling method is characterized in that: the method comprises the following steps:

s100, treating the saline-alkali well water, wherein the treated saline-alkali well water is used as water for cultivation, desalination and seedling raising respectively;

s300, placing fertilized eggs of marine fishes in a hatching pond for hatching;

s400, placing the hatched fries in a cement pond for early-stage cultivation;

s500, carrying out desalination cultivation on the fries in the step S400;

S700, when the fries grow to more than 30mm in the pond, fishing and selling the fries;

During the desalination cultivation process, fish fries need to be fed with baits, wherein the baits comprise one or more of insect pulp, chlorella, rotifer, artemia nauplii and compound feeds;

The compound feed is prepared by mixing worm pulp and microparticles, wherein the mixing ratio of the worm pulp to the microparticles is 1:8;

In the step S400, the fries are fed by the following method: fertilized eggs grow in a nutritional way within 4 days after membrane rupture by utilizing nutrition matters in yolk, when the fish fry after membrane rupture grow to 2mm, housefly adult pulp is firstly put in, and the dosage is 0.5-1 mg/L twice a day; then adding chlorella algae liquid to enable the number of chlorella in the water body in the pond to be 10-30 ten thousand/mL, and feeding the high-temperature cultivated small individual rotifers to enable the number of the small individual rotifers in the pond to be 3-5/mL; when the fish fry grows to 4mm, feeding rotifers so that the number of the rotifers in the pond is 5-10 mg/L, continuously throwing in adult fly pulp with the dosage of 0.5-1 mg/L, feeding three times a day, and continuously supplementing chlorella algae liquid so that the number of the chlorella in the pond is 10-30 ten thousand/mL; when the fish fry grows to 7mm, feeding artemia nauplii, so that the number of artemia nauplii in the pond is 0.5-1/mL, continuously feeding rotifers, so that the number of rotifers in the pond is kept at 10/mL, and feeding a small amount of micro-particle compound feed with worm pulp, wherein the dosage of the compound feed is 1 mg/L-1.5 mg/L, and three times per day.

2. The method for desalinating and raising sea fish according to claim 1, wherein: the salinity of the water for cultivating in the step S200 is 22-25 per mill, and the salinity of the water for cultivating the pond in the step S600 is not lower than 0.8 per mill.

3. The method for desalinating and raising sea fish according to claim 1, wherein: in the step S600, the fries are fed by the following method: when the fish fry grows to 15mm, living baits such as the cladocera, the copepods, the insect larvae and the like cultured in the pond can be mixed with the compound feed for feeding.

4. The method for desalinating and raising sea fish according to claim 1, wherein: the incubating salinity in the incubating pond in the step S300 is 22-25%, the water temperature is 18-20 ℃, the pH value is 7.8-8.5, the dissolved oxygen amount is more than 5mg/L, and the ammonia nitrogen content is less than 0.1 mg/L.

5. The method for desalinating and raising sea fish according to claim 1, wherein: the method comprises the steps of S500, wherein a plurality of salinity steps are arranged, the salinity of desalted water of the first salinity step is 20-25%, the salinity of desalted water of the last salinity step is consistent with the salinity of cultivation water in a pond, the salinity difference between the salinity steps is 1-10%, sea water fries are kept in the desalted water of different salinity steps for 10-15 h, the desalination cultivation temperature is 18-25 ℃, the pH value in the desalination cultivation process is 7.5-8.5, the dissolved oxygen amount is more than 5mg/L, and the ammonia nitrogen content is less than 0.1 mg/L.

6. The method for desalinating and raising sea fish according to claim 1, wherein: the method for treating the saline-alkali well water in the step S100 comprises the following steps: firstly pumping underground saline-alkali well water into a sedimentation tank, exposing and insolating the saline-alkali well water in the sedimentation tank, aerating and heating the saline-alkali well water, and filtering the saline-alkali well water in the sedimentation tank through a cotton bag.

7. A method for desalinating and raising sea fish according to any one of claims 1 to 6, wherein: the marine fish in the step S300 is selected from one of black sea bream, red fish in the United states and seven-star weever.