CN109937923B - Method for improving pond-out specification of fingerlings of current-year alosa sapidissima pond culture - Google Patents
Method for improving pond-out specification of fingerlings of current-year alosa sapidissima pond culture Download PDFInfo
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Abstract
The invention relates to the field of aquaculture, in particular to a method for improving the pond-out specification of the pond culture of American shad in the current year, which comprises 8 production steps of pond preparation, bait organism culture, summer shady fish stocking, bait and feeding, water quality regulation and control, pond shading time shortening, pond greenhouse building and net pulling and pond outlet. The invention has the outstanding advantages that: the technical scheme of the invention improves two current modes of pond culture of the American shad in the current year fingerling: postpone and hide the membrane with hiding and demolish in advance, shorten pond and hide the time, in time put up methods such as pond big-arch shelter, solved the American reeves shad pond culture and breed the problem that the pond size is little that appears in the year, kept the advantage of these two kinds of pond culture modes, avoided the shortcoming of these two kinds of culture modes. The method is simple and convenient to operate, does not need fine operation, does not need to receive system training, is easy to be accepted and popularized by people, and is suitable for large-scale production.
Description
Technical Field
The invention relates to the technical field of aquaculture, in particular to a method for improving the pond-out specification of the fingerlings of the current year of alosa sapidissima pond culture.
Background
American reeves shads (Alosa sapidisima) belong to the order herring (Clupeomorpha), the order herring (Clupeiformes), the family herring (Clupeidae), the genus seudhurus (Alosa), and are colonizing migratory fish, mainly distributed in north american atlantic coast from quebec, canada to florida rivers and oceans in the united states. The alosa sapidissima food is rich and delicious, has fresh meat and delicious taste, has high economic value, is suitable for pond culture and industrial culture, and is widely introduced all over the world. In China, the aquatic product research institute in Shanghai city introduces the American shad fertilized eggs from the United states for artificial propagation first in 1998, and as the American shad is similar to the Chinese shad (Tenualosa reevesii) in appearance and meat quality, the cultured American shad is deeply loved by the national citizens, the market price is also very high and can reach 150 yuan/Kg (one year per second).
At present, the American shad breeding area in China is gradually enlarged, and the breeding modes mainly comprise 3 types, namely factory breeding, net cage breeding, pond breeding and the like, but the factory breeding has certain limitations, such as large investment of early-stage infrastructure, high operation cost and the need of pumping deep-well water or introducing mountain spring water to maintain the water temperature of breeding water; and large water surface is required for cage culture, such as: under the situation that the national environmental protection requirements are increasingly improved, the culture mode of pumping underground water or large-water surface net cages faces severe environmental protection pressure and is increasingly questioned, and the American shad pond culture mode is increasingly looked after.
However, researches find that the current fish species cultured in the American shad pond all have the problem of small pond-out specification at the end of the year (the body length is 12.0-12.46cm, and the body weight is 23.48-26.53g) (Dong rock, octopus, the key technology of the hatching and domestication of the American shad and artificial seedling culture [ J ]. scientific fish culture, 2009(06): 9-10; Yonghai, Xujiabo, Liu Yong, and the like. the growth rule and difference of the current fish species cultured in the open pond and the shading pond [ J ]. Shanghai ocean university bulletin, 2019,28 (2): 161 and 170), so that the problems of small market-out specification and low market-out yield of the commercial shad in the second year are caused, and the commercial fish culture benefit in the second year is seriously influenced; and researches find that the culture modes of the American shad in the current year in an open pond or a shading pond have respective advantages and disadvantages (Shiyonghai, Xujiabo, Liu Yongshi, and the like. the growth rule and difference of the American shad in the current year in the open pond and the shading pond [ J ]. Shanghai ocean university bulletin, 2019,28 (2): 161 and 170). Therefore, a set of technical scheme is urgently needed to combine the advantages and the disadvantages of the original several pond culture modes, improve the existing alosa sapidissima pond culture mode, improve the pond-out specification of the alosa sapidissima in the current year at the end of the year, and further improve the commercial alosa sapidissima culture benefit in the second year.
Disclosure of Invention
The invention aims to provide a method for improving the pond-out specification of the current year of pond culture of alosa sapidissima so as to improve the marketing time and the yield of commercial alosa sapidissima culture in the second year, and further improve the culture benefit of the commercial alosa sapidissima.
In order to achieve the purpose, the invention provides a method for improving the pond-out specification of the fingerlings of the alosa sapidissima in pond culture in the current year, which comprises 8 production steps of pond preparation, bait organism culture, summer fingerling stocking, bait and feeding, water quality regulation and control, pond shading time shortening, pond greenhouse building and net pulling and pond outlet, and comprises the following steps:
A) preparing a pond: selecting a pond with sediment bottom, wherein the area is 2.5-5.0 mu, the water depth is 1.5-1.8m, the ventilation performance of the periphery is good, 1 impeller type aerator with 1.5kW is arranged in every 2.5 mu, and a water inlet is filtered by a 60-mesh screen; before the pond is used, 300 plus 400 jin/mu quicklime water is used for sprinkling and disinfecting the whole pond, and the water is thoroughly drained and solarized for later use;
B) bait organism culture: introducing fresh water 7-10 days before stocking the fingerlings, culturing basic bait organisms in advance, inoculating daphnia magna in fresh water, such as Moina gymnadenia, daphnia magna and the like, after 3-5 days in summer in Jiangzhe area at the water temperature of 28-30 ℃, and allowing the biomass of the daphnia magna to reach 20-40/L for 3-5 days, so that the alosa shad and the summer fingerlings can be stocked;
C) stocking the summer fingerlings: the fish seeds require more than 90% of the individuals to be domesticated and fed with puffed compound feed (Zhejiang Minghui feed limited company produces puffed feed for marine fish, fry 0#The feed has the particle size as follows: 1.8 mm; conventional nutrient components: water content of 4.51%, crude protein content of 40.29%, crude fat content of 14.44%), and individual body length of 3.5-4.5 cm; the breeding of the summer fingerlings is generally 6-7 months; selecting to be carried out before 9 am as much as possible, carrying out light-shielding transportation on the fingerlings by adopting a barrel with the volume of 20-25L, filling 8-10L of water in the barrel, filling 20-30 fingerlings in each barrel, and keeping the total time of the processes of loading, transporting, stocking and the like not more than 20 minutes each time; the stocking density is 1600-;
D) bait and feeding: feeding artificial feed in time after stocking fish seeds, wherein the feed is seawater fish puffed feed (Zhejiang Minghui feed Co., Ltd.), and feeding 0 in 7-8 months#Feed (grain size 1.8 mm; conventional nutrient components: water content 4.51%, crude protein content 40.29%, crude fat content 14.44%), and feeding 1 in 9-11 months#Feeding the feed (the grain diameter is 2.2-2.6 mm; the conventional nutrient components comprise 6.16% of water content, 40.00% of crude protein content and 11.19% of crude fat) for 2 times (8: 00; 16: 00) every day, wherein the feeding amount is based on 2 hours after the feed is completely ingested;
E) water quality regulation and control: after the fingerlings are put in the fish breeding pool, the starting time of a general aerator is 20: 00-21: 00, the shutdown time is the next day 5: 00-6: 00, increasing the starting time when weather changes occur; changing water 1/3 every half a month, if the water temperature exceeds 32 ℃, reducing the water changing times as much as possible;
F) shortening the shading time of the pond: postponing building a pond shading greenhouse, building a herringbone steel wire rope flexible greenhouse above the pond after the seeding is generally placed for 7-10 days, pulling a shading film with shading rate of more than 90%, and ventilating two sides; the shading film is removed in advance, when the temperature of the pond water in the shading shed is continuously lower than 25 ℃, the shading film is removed generally in the middle 9 th of a month;
in the technical scheme of the invention, the time for covering the shading film is delayed: the shading film is pulled before the seedlings are put in the original technology, and the shading film is pulled after the seedlings are put for one week, so that the problem of illumination weakening caused by pond shading is solved in the early stage of breeding of the Alosa sapidissima fingerlings in the current year, the advantages of massive multiplication of phytoplankton in an open pond are reserved, the Alosa sapidissima fingerlings like eating the zooplankton, and the problem of insufficient bait feeding in artificial breeding is effectively solved;
meanwhile, the method removes the shading film in advance, and the time (in the middle of 9 months) for removing the shading film is about 1 month earlier than that of the prior art (in the middle of 10 months), so that the photosynthesis of algae in the water body of the pond is facilitated, the dissolved oxygen of the water body is increased, the water quality is stable, and the water temperature of the pond in the period is improved by strong light.
G) Building a pond greenhouse: when the water temperature of the pond is lower than 20 ℃, generally to 10 ten-day of the month, a herringbone pond greenhouse is built, a 0.1mm non-drop agricultural film is covered by pulling, and the two sides are ventilated;
according to the invention, a pond greenhouse is built in time, the temperature gradually drops after the cultivation is carried out for 10 months, and the heat-preservation agricultural film is covered above the pond in time, so that the drop of the water temperature of the pond is slowed down, and the growth of American reeves shads is facilitated.
H) Drawing a net and discharging from the pool: when the temperature of the pond in the greenhouse is 14-16 ℃, generally in the last 12 months, pulling the net to discharge the pond, carrying out net pulling exercise before discharging the pond, then pulling the net to pick up the pond, wherein the net is made of polyethylene leather strip net with the mesh of 2 x 3 mm.
After the American reeves shad is cultured in the pond in the current year, the length and the weight of the fingerlings in the fingerling-out-of-pond specification respectively reach 16-18cm and 65-70g, the fullness is 1.40-1.50, the daily average growth rate and the weight gain rate are respectively 0.085-0.095cm/d and 0.45-0.50g/d, the culture survival rate is 75-80%, and the bait coefficient is 1.60-1.80.
Compared with the prior art, the invention has the advantages that:
1. the time to mask the shading film is delayed: the shading film is pulled before the seedlings are put in the original technology, and the shading film is pulled after the seedlings are put for one week, so that the problem of illumination weakening caused by pond shading is solved in the early stage of breeding of the Alosa sapidissima fingerlings in the current year, the advantages of massive multiplication of phytoplankton in an open pond are reserved, the Alosa sapidissima fingerlings like eating the zooplankton, and the problem of insufficient bait feeding in artificial breeding is effectively solved;
2. the method has the advantages that the time (in the middle of 9 months) for removing the shading film is about 1 month earlier than that of the prior art (in the middle of 10 months), which is beneficial to photosynthesis of algae in the water body of the pond, so that the dissolved oxygen of the water body is increased, the water quality is stable, and the water temperature of the pond in the period is improved by strong light;
3. a pond greenhouse is built in time, the temperature gradually drops after the cultivation is carried out for 10 months, and a heat-preservation agricultural film is covered above the pond in time, so that the drop of the water temperature of the pond is slowed down, and the growth of American reeves shads is facilitated;
4. the technical scheme of the invention improves two current modes of pond culture of the American shad in the current year fingerling: postponing covering and dismantling the shading film in advance, shortening the shading time of the pond, building a pond greenhouse in time and the like, solving the problem that the size of the fingerling in the current American shad pond culture is small, keeping the advantages of the two pond culture modes, avoiding the defects of the two culture modes, wherein the size of the fingerling in the current American shad pond culture is increased from 12.0-12.46cm, 23.48-26.53g of the weight of the fingerling in the current American shad pond culture to 16.50-16.89cm and 65.97-69.68g of the improved mode, and the daily average growth rate is increased from 0.075-0.076cm/d to 0.088-0.090 cm/d.
5. The method is simple and convenient to operate, does not need fine operation, does not need to receive system training, is easy to be accepted and popularized by people, and is suitable for large-scale production.
Detailed Description
The following examples are provided to illustrate specific embodiments of the present invention.
Example 1:
the invention relates to a method for improving the pond-out specification of the fingerlings cultivated in the American shad pond in the current year, which comprises 8 production steps of pond preparation, bait organism cultivation, summer shady fingerling stocking, bait and feeding, water quality regulation and control, pond shading time shortening, pond greenhouse building and net pulling and pond outlet, and specifically comprises the following steps:
1. preparing a pond: selecting a pond with sediment bottom, wherein the area is 2.5-5.0 mu, the water depth is 1.5-1.8m, the ventilation performance of the periphery is good, 1 impeller type aerator with 1.5kW is arranged in every 2.5 mu, and a water inlet is filtered by a 60-mesh screen; before the pond is used, 300 plus 400 jin/mu quicklime water is used for sprinkling and disinfecting the whole pond, and the water is thoroughly drained and solarized for later use;
2. bait organism culture: introducing fresh water 7-10 days before stocking the fingerlings, culturing basic bait organisms in advance, inoculating daphnia magna in fresh water, such as Moina gymnadenia, daphnia magna and the like, after 3-5 days in summer in Jiangzhe area at the water temperature of 28-30 ℃, and allowing the biomass of the daphnia magna to reach 20-40/L for 3-5 days, so that the alosa shad and the summer fingerlings can be stocked;
3. stocking the summer fingerlings: the fish seeds require more than 90% of the individuals to be domesticated and fed with puffed compound feed (Zhejiang Minghui feed limited company produces puffed feed for marine fish, fry 0#The feed has the particle size as follows: 1.8 mm; conventional nutrient components: water content of 4.51%, crude protein content of 40.29%, crude fat content of 14.44%), and body length of 3.5-4.5 cm. The breeding of the summer fingerlings is generally 6-7 months; selecting to be carried out before 9 am as much as possible, carrying out light-shielding transportation on the fingerlings by adopting a barrel with the volume of 20-25L, filling 8-10L of water in the barrel, filling 20-30 fingerlings in each barrel, and keeping the total time of the processes of loading, transporting, stocking and the like not more than 20 minutes each time. The stocking density is 1600-;
4. bait and feeding: feeding artificial feed in time after stocking fish seeds, wherein the feed is seawater fish puffed feed (Zhejiang Minghui feed Co., Ltd.), and feeding 0 in 7-8 months#Feed (grain size 1.8 mm; conventional nutrition)The components: water content of 4.51%, crude protein content of 40.29%, crude fat content of 14.44%), and feeding 1 in 9-11 months#Feeding the feed (the grain diameter is 2.2-2.6 mm; the conventional nutrient components comprise 6.16% of water content, 40.00% of crude protein content and 11.19% of crude fat) for 2 times (8: 00; 16: 00) every day, wherein the feeding amount is based on 2 hours after the feed is completely ingested;
5. water quality regulation and control: after the fingerlings are put in the fish breeding pool, the starting time of a general aerator is 20: 00-21: 00, the shutdown time is the next day 5: 00-6: 00, increasing the starting time when weather changes occur; changing water 1/3 every half a month, if the water temperature exceeds 32 ℃, reducing the water changing times as much as possible;
6. shortening the shading time of the pond: postponing building a pond shading greenhouse, building a herringbone steel wire rope flexible greenhouse above the pond after the seeding is generally placed for 7-10 days, pulling a shading film with shading rate of more than 90%, and ventilating two sides; the shading film is removed in advance, when the temperature of the pond water in the shading shed is continuously lower than 25 ℃, the shading film is removed generally in the middle 9 th of a month;
7. building a pond greenhouse: when the water temperature of the pond is lower than 20 ℃, generally to 10 ten-day of the month, a herringbone pond greenhouse is built, a 0.1mm non-drop agricultural film is covered by pulling, and the two sides are ventilated;
8. drawing a net and discharging from the pool: when the temperature of the pond in the greenhouse is 14-16 ℃, generally in the last 12 months, pulling the net to discharge the pond, carrying out net pulling exercise before discharging the pond, then pulling the net to pick up the pond, wherein the net is made of polyethylene leather strip net with the mesh of 2 x 3 mm.
After the American reeves shad is cultured in the pond in the current year, the length and the weight of the fingerlings in the fingerling-out-of-pond specification respectively reach 16-18cm and 65-70g, the fullness is 1.40-1.50, the daily average growth rate and the weight gain rate are respectively 0.085-0.095cm/d and 0.45-0.50g/d, the culture survival rate is 75-80%, and the bait coefficient is 1.60-1.80.
Example 2
In 2018, the method for improving the pond-out specification of the fingerlings cultured in the American shad pond in the current year is adopted, and the culture is implemented:
selecting a pond with sediment bottom, wherein the area of the pond is 2.5 mu (666.7 m per mu)2) The test pond is 51#And 52#Water, waterThe depth is 1.5-1.8m, each pond is provided with 1 impeller type aerator of 1.5kW, a water inlet is filtered by a 60-mesh bolting silk net, and a water outlet is provided with a polyethylene drainage purse net with meshes of 2 multiplied by 3mm and a 40-mesh bolting silk gate net; before the pond is used, the pond is cleaned and disinfected, and the pond is thoroughly drained and solarized for later use. According to the breeding process of local alosa sapidissima, before breeding the fingerlings, basic bait organisms are cultured in the pond in advance, water is generally fed in 7-10 days in advance, the color of the water in the pond is thickened after 3-5 days at the water temperature of 28-30 ℃, daphnia magna seeds are inoculated, and the fingerlings are bred when the bait biomass reaches 20-40 per liter.
The fingerlings are released in the morning on cloudy days, the fingerlings are transported in a barrel with the volume of 20L in a dark place, 10L of water is filled in the barrel, 20-30 fingerlings are filled in each barrel, and the total time of the loading, transporting, releasing and the like in each time is not more than 20 minutes. And (3) specification of stocking the fry: the body length is 3.5-4.5cm, and the body weight is 0.6-1.2 g; after the fry are domesticated, more than 90 percent of the fry can eat the puffed compound feed. The stocking density is 2.45 tails/m2And 2.82 tails/m2. The specific stocking is shown in Table 1.
Table 12018 years of basic situation of stocking American reeves shad species
Feeding artificial feed in time after stocking fish seeds, wherein the feed is seawater fish puffed feed (Zhejiang Minghui feed Co., Ltd.), and feeding 0 in 7-8 months#Feed (conventional nutritional ingredients: water content 4.51 + -0.12%, crude protein content 40.29 + -0.03%, crude fat content 14.44 + -0.33%, n-3) for 9-11 months#The feed (conventional nutrient components: water content is 6.16 plus or minus 0.29%, crude protein content is 40.00 plus or minus 0.28%, crude fat content is 11.19 plus or minus 0.72%, n is 3) is fed for 2 times (8: 00; 16: 00) every day, and the feeding amount is based on 2 hours after the completion of feeding.
After the fingerlings are put in the fish breeding pool, the starting time of a general aerator is 20: 00-21: 00, the shutdown time is the next day 5: 00-6: 00, increasing the starting time when weather changes occur; the water is changed at 1/3 every half a month, and if the water temperature exceeds 32 ℃, the water changing times are reduced as much as possible. During the test period, temperature measurements were taken 2 times per day (8: 00; 16: 00).
Covering the shading film by pulling after the seedlings are put for one week (24 days in 7 months), removing the shading film in 12 days in 9 months, and covering the heat-preservation agricultural film by pulling after 19 days in 10 months.
And pulling the net to catch the fish up after 12 months and 4 days. Before the fish is taken out of the pool, the net is pulled to be trained, and the net is pulled to be caught by a polyethylene leather strip net with the mesh of 2 multiplied by 3 mm.
The shady culture mode of the American shad pond in the current year is improved, and a better culture effect is obtained: after the American reeves shad is cultured for 144 days in the current year, the body length and the body weight of the reeves shad respectively reach 16.50-16.89cm and 65.97-69.68g, the fullness is 1.42-1.50, the daily average growth rate and the weight gain rate are respectively 0.088-0.090cm/d and 0.453-0.476g/d, the culture survival rate is 75.94-78.96%, and the bait coefficient is 1.63-1.77. See tables 2-3 for details.
TABLE 22018 years Pond culture test result of American shad of the current year
TABLE 32018 growth coefficient of current year pond culture of Alosa sapidissima
Comparing the culture effect of the American shad in each culture mode in the current year: the improved shading pond culture mode has better culture effect (the harvest length is 16.50-16.89cm, the weight is 65.97-69.68g, and the daily average growth rate is 0.088-0.090cm/d) than other pond culture modes (the harvest length is 12.0-12.46cm, the weight is 23.48-26.53, and the daily average growth rate is 0.075-0.076cm/d) (Dongjiang tiger, American shad hatching and domestication and artificial breeding key technology [ J ] scientific culture, 2009(06): 9-10; Yonghai, Xujiabo, Liu Yongshi, and the like; growth rule and difference of the current-year shad cultured by open ponds and shading ponds [ J ] Shanghai Seisakui ocean journal, 2019,28 (2): 161. 170) and Yangtze river net cage culture modes (the harvest length is 13-16cm, the weight is 30-50g, and the daily average growth rate is 0.069-0.082cm/d) (university), early detection [ J ] scientific fish culture, 2010(08):30-31) (Table 4) for Changjiang river cage culture of Alosa sapidissima in Dinghuadong (Alosa sapidissima), similar to deep-well water cement pond effect (the harvest length is 12.35-13.88cm, the weight is 23.6-42.5g, and the average daily growth rate is 0.076-0.111cm/d) (Houguanjun, Pangdiang, Wangquan, etc.. high-density cultivation test of Alosa sapidissima fingerlings [ J ] water conservancy fishery, 2008(02): 60-61; american shad large-sized fish breeding test [ J ] scientific fish culture, 2019(01):6-7) (Table 4).
TABLE 4 comparison of the breeding effect of Alosa sapidissima in the current year under different modes
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited thereto, and that various changes and modifications may be made without departing from the spirit of the invention, and the scope of the appended claims is to be accorded the full range of equivalents.
Claims (1)
1. The utility model provides a method for improving american shad pond culture current year fingerling ex-pool specification, its characterized in that, by pond preparation, bait biological cultivation, summer fingerling is put in the suitable place to breed, bait and is thrown something and fed, water quality control, shorten pond shading time, build pond big-arch shelter, pull net 8 production steps of going out of pool and constitute, include:
A) preparing a pond: selecting a pond with a sediment bottom, wherein the area of the pond is 2.5-5.0 mu, the water depth is 1.5-1.8m, the air permeability of the periphery is good, 1 impeller type aerator of 1.5kW is arranged every 2.5 mu, and a water inlet is filtered by a 60-mesh bolting silk net; before the pond is used, 300 plus 400 jin/mu quicklime water is used for sprinkling and disinfecting the whole pond, and the water is thoroughly drained and solarized for later use;
B) bait organism culture: feeding fresh water 7-10 days before stocking the fingerlings, culturing basic bait organisms in advance, inoculating daphnia magna in fresh water after 3 days in summer in Jiangzhe area at the water temperature of 28-30 ℃ and the pond water transparency is lower than 30cm, and stocking the American shad and summer fingerlings for 3-5 days after the daphnia magna biomass reaches 20-40 per liter;
C) stocking the summer fingerlings: more than 90% of fish seeds are required to be domesticated and fed with the expanded compound feed, and the body length of each fish seed is 3.5-4.5 cm; the summer fingerling is bred in 6-7 months; the stocking density is 1600-; the method comprises the following steps of selecting the breeding of the fish species in summer before 9 am, carrying out light-shielding transportation on the fish species by adopting a barrel with the volume of 20-25L, filling 8-10L of water in the barrel, filling 20-30 fish species in each barrel, wherein the total time of each loading, transportation and breeding process is not more than 20 minutes; the puffed compound feed is a puffed feed for marine fish, and the fish fry is 0#The feed has the particle size as follows: 1.8 mm; conventional nutrient components: the water content was 4.51%, the crude protein content was 40.29%, the crude fat content was 14.44%;
D) bait and feeding: feeding artificial feed in time after breeding the fingerlings, wherein the feed is expanded feed for the marine fishes, and the feeding is carried out for 0 month in 7-8#Feed, feeding for 9-11 months 1#The feed is fed for 2 times every day, and the feeding time every day is 8: 00 and 16: 00, the feeding amount is based on 2 hours of complete feeding; 0#The grain diameter of the feed is as follows: 1.8 mm; conventional nutrient components: the water content was 4.51%, the crude protein content was 40.29%, the crude fat content was 14.44%; 1#The grain diameter of the feed is as follows: 2.2-2.6 mm; conventional nutrient components: the water content is 6.16%, the crude protein content is 40.00%, and the crude fat content is 11.19%;
E) water quality regulation and control: after the fingerlings are put in the fish breeding pool, the starting time of the aerator is 20: 00-21: 00, the shutdown time is the next day 5: 00-6: 00, increasing the starting time when weather changes occur; changing water 1/3 every half a month, if the water temperature exceeds 32 ℃, reducing the water changing times as much as possible;
F) shortening the shading time of the pond: postponing building a pond shading greenhouse, building a herringbone steel wire rope flexible greenhouse above the pond 7-10 days after seedling placement, pulling and covering a shading film with shading rate of more than 90%, and ventilating two sides; removing the shading film in advance, and removing the shading film in the middle ten days of 9 months when the water temperature of the pond in the shading shed is continuously lower than 25 ℃;
G) building a pond greenhouse: when the water temperature of the pond is lower than 20 ℃ to 10 middle ten days, a herringbone pond greenhouse is built, a 0.1mm non-drop agricultural film is covered by pulling, and the two sides are ventilated;
H) drawing a net and discharging from the pool: when the water temperature of the pond in the greenhouse is 14-16 ℃, the net is pulled out of the pond in the last 12 th month; before the net is taken out of the pool, the net is pulled to be exercised, and then the net is pulled to be caught, and the net is pulled by a polyethylene strip net with the mesh of 2 multiplied by 3 mm.
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| CN107094667A (en) * | 2017-05-03 | 2017-08-29 | 上海市水产研究所 | A kind of America hilsa herring continental rise and Tu Chi are segmented relay-type cultural method |
| CN108552090A (en) * | 2018-05-09 | 2018-09-21 | 上海市水产研究所 | A kind of overwintering fattening method of imitative migration soil pond greenhouse of two age America hilsa herrings |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107094667A (en) * | 2017-05-03 | 2017-08-29 | 上海市水产研究所 | A kind of America hilsa herring continental rise and Tu Chi are segmented relay-type cultural method |
| CN108552090A (en) * | 2018-05-09 | 2018-09-21 | 上海市水产研究所 | A kind of overwintering fattening method of imitative migration soil pond greenhouse of two age America hilsa herrings |
Non-Patent Citations (1)
| Title |
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| 敞口池塘和遮荫池塘养殖美洲鲥当年鱼种的生长规律和差异;施永海 等;《上海海洋大学学报》;20181211;1-13 * |
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