CN111657191B - Method for regulating natural spawning of parent fish of seriolala quinqueradiata - Google Patents
Method for regulating natural spawning of parent fish of seriolala quinqueradiata Download PDFInfo
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- CN111657191B CN111657191B CN202010583776.6A CN202010583776A CN111657191B CN 111657191 B CN111657191 B CN 111657191B CN 202010583776 A CN202010583776 A CN 202010583776A CN 111657191 B CN111657191 B CN 111657191B
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/10—Culture of aquatic animals of fish
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
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- A23K10/00—Animal feeding-stuffs
- A23K10/20—Animal feeding-stuffs from material of animal origin
- A23K10/22—Animal feeding-stuffs from material of animal origin from fish
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K50/00—Feeding-stuffs specially adapted for particular animals
- A23K50/80—Feeding-stuffs specially adapted for particular animals for aquatic animals, e.g. fish, crustaceans or molluscs
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
Abstract
The invention provides a method for regulating natural spawning of parent fish of seriolala quinqueradiata, belonging to the field of aquaculture, and the method comprises the steps of parent fish selection, parent fish cultivation and reproduction regulation natural spawning; the reproduction regulation and control natural spawning: the reproduction control spawning refers to controlling the gonad development and maturation of the parent fish and natural spawning by controlling the conditions including water temperature, photoperiod, water flow and nutrition of parent fish culture; the method can lead the parent fish to naturally lay eggs in the culture pond within the regulation period of 60-77 days to obtain high-quality fertilized eggs, the spawning period can be advanced by 1-2 months compared with the natural world, the spawning period can reach 45-60 days, the fertilization rate reaches more than 90 percent, and the hatching rate reaches more than 70 percent.
Description
Technical Field
The invention belongs to the field of marine fish reproductive biology, and particularly relates to a method for regulating natural spawning of parent fish of yellowtail.
Background
The mariculture is an important way for developing and utilizing marine biological resources, the mariculture yield of China reaches 2031 ten thousand tons in 2018, which accounts for 2/5 of the total amount of aquaculture, and the mariculture method makes a prominent contribution to guaranteeing the supply of high-quality protein in China. In recent years, with the steady advance of national strategies such as China's oceanic strong country construction, ecological civilization construction and the like, the near-shore mariculture development space is strictly controlled, and the active development and utilization of new deep and far sea space becomes the strategic choice for China's oceanic fishery strong country construction.
In the exploration of deep open sea aquaculture, from the 80 s in the 20 th century, some developed countries began to try the exploration and application of deep open sea aquaculture technology. At present, remarkable progress is made internationally in deep and open sea culture platforms and variety processes. Throughout the international precedent for the success of developing deep open sea culture, platform + equipment + variety + process is the key for success, and excellent varieties can provide suitable species guarantee for deep open sea culture and obviously improve culture benefits, for example, in Europe, particularly in Norwegian salmon culture, and a 'one fish' full industrial chain culture engineering mode is established by taking a large net cage as a platform. Therefore, the selection and breeding of excellent breeding varieties is the key to solve the 'what' problem in the deep open sea breeding of China. Yellow seriolas is an oceanic economic fish which is widely distributed in the global water area and has the characteristic of long-distance migration, has the characteristics of large body size and quick growth, has the nutritional quality comparable to salmon and tuna, and is deeply favored by the international consumer market. The yellow seriolae is particularly suitable for the culture of large-scale culture facilities such as deepwater wind-wave-resistant net cages and the like, is an ideal fish suitable for the deep-open sea culture platform, and is developed in Japan, Australia, New Zealand and other countries. For a long time, breeding manufacturers at home and abroad mainly rely on wild seedlings to carry out breeding, but with the continuous decline of natural resources, the wild seedlings are not enough to support the development of the breeding industry. Therefore, the development of artificial breeding and the cultivation of high-quality artificial seedlings are the way out for guaranteeing the supply of the deep and open sea breeding seeds. However, the large-scale breeding technology of the seeds of seriolala quinqueradiata has not been broken through internationally at present, and the main reason is that the fertilized eggs are difficult to obtain and unstable in quality, so that the technology becomes a bottleneck limiting the continuous development of the seriolala quinqueradiata breeding industry.
Disclosure of Invention
Aiming at the technical problems, the invention provides a method for regulating natural spawning of yellow serila quinqueradiata parent fish, which promotes the parent fish gonad to mature and naturally spawn by artificial continental sea relay cultivation and comprehensive reproduction regulation measures, obtains mass fertilized eggs naturally spawned, and provides sufficient high-quality fertilized egg guarantee for seed production.
The invention is realized by the following technical scheme:
the invention provides a method for regulating natural spawning of parent fish of seriolala quinqueradiata, which comprises the steps of parent fish selection, parent fish cultivation and reproduction regulation natural spawning;
1) selecting the parent fish: selecting active and healthy parent fishes with normal body color according to morphological germplasm standards to establish a breeding population; the parent fish needs to be over 4 years old, the total length is over 80cm, and the weight is over 7.0 kg;
2) the parent fish cultivation: the parent fish is cultivated by adopting two modes of land-based factory running water cultivation and offshore net cages; when the water temperature of the natural seawater is lower than 18 ℃, transferring the parent fish to a land-based factory workshop for overwintering cultivation, wherein the water temperature of the overwintering cultivation is 15-17 ℃; when the temperature of the natural seawater is higher than 18 ℃, transferring the parent fish to an offshore net cage for cultivation;
(1) the land-based industrial running water cultivation comprises cultivation facilities, cultivation density and sex matching, bait feeding and cultivation condition control;
the cultivation facilities refer to cement ponds or glass fiber reinforced plastic water tanks arranged in industrial cultivation workshops, and the effective water usage is 150m3The above; the parent fish breeding density is 2-4kg/m3The sex ratio of male parent to female parent is 1: 1-1.5;
the cultivation condition is controlled to be water temperature of 16-25 ℃; culturing with running water, wherein the water change rate is 400-600%, the dissolved oxygen is more than or equal to 6.0mg/L, the pH value is 7.6-8.2, the salinity is 28-33, and cleaning and changing water in a pond at regular time;
further, the parent fish bait mainly comprises icy mackerel and bowled jade fish, and is fed according to 3-5% of the weight of the parent fish in daily management, adjusted to 1-2% before and after spawning, and fed twice daily;
(2) parent fish offshore cage culture, which comprises culture facilities, culture density, bait feeding and culture conditions;
the marine cage culture means that when the natural water temperature reaches more than 18 ℃ or the spawning of parent fishes is finished, the parent fishes are transferred into a marine deep-water wind wave resistant cage from a land-based industrial aquaculture workshop to continue to culture for summer, and the deep-water wind wave resistant cage is of a plastic or metal structure and is round or square; the size of the square net cage is 10m multiplied by 8 m; the circular net cage is made of HDPE plastic, and the circumference of the circular net cage is more than 50 m;
the culture conditions are as follows: culturing at 18-28 deg.C with dissolved oxygen of 7-9mg/L and salinity of 30-33, and transferring parent fish to land-based factory workshop for overwintering culture when natural seawater temperature is lower than 18 deg.C, wherein the water temperature for overwintering culture is 15-17 deg.C; the parent fish breeding density is 2-3kg/m3；
Further, the bait comprises mackerel and bowled ammomus, the feeding amount is 3-5% of the weight of the mackerel, and the bait is fed twice a day;
3) the reproduction regulation and control natural spawning: the reproduction control spawning refers to controlling the gonad development and maturation of the parent fish and natural spawning by controlling the conditions including water temperature, photoperiod, water flow and nutrition of parent fish culture;
(1) the water temperature control means that the water temperature for breeding the parent fish is artificially controlled from two months before spawning, the temperature is gradually increased from 17 ℃ to 21 ℃ in the range of 0.5 ℃ per week and is kept until spawning is finished, and the effective accumulated temperature in the reproductive control period of the parent fish needs to reach 1937 DEG Chour-2070 DEG Chour;
furthermore, the water temperature regulation and control is realized by heating natural seawater by an environment-friendly boiler and combining the natural seawater with a heat exchanger to reuse waste heat temperature of workshop discharge water, so that the environment is protected;
(2) the photoperiod regulation and control means that a white LED light source and a dusk lamp are arranged above a parent fish culture pond, and the gonad development of the parent fish is stimulated by manually controlling the illumination time;
arranging an LED lamp above the water surface of the parent fish culture pond, regulating the illumination intensity of the water surface to be 300-; the start time of the photoperiod regulation and control is synchronous with the regulation and control of the water temperature, the artificial regulation and control of the illumination is started at 7 am every day, the illumination time is gradually prolonged from 11 hours to 14 hours in 40 days, the illumination time is kept for 10 days, and then the illumination time is gradually shortened to 13 hours in 10 days until the parent fish spawns;
the dusk lamp is an LED lamp with a yellow light source arranged above the middle of the parent fish culture pond, the power of the dusk lamp is 60W, the dusk lamp can gradually reduce the intensity and extinguish within 15min under the regulation and control of a control switch, and the dusk lamp keeps for 15min after the brightness of the dusk lamp is gradually reduced to 100lux of illumination intensity of the water surface after other light sources are extinguished and then extinguishes;
(4) the water flow stimulation means that water flow is produced in the parent fish breeding pond; controlling the water flow speed within 0.3-0.5m/s, and setting the maximum flow speed in the time period from dusk to dark;
(5) the nutrition reinforcement means that the growth of gonads and gametes of parent fishes is promoted by the regulation of bait nutrition and additives from the beginning of reproduction regulation to 2 months before spawning, the gamete quality is improved, and high-quality fertilized eggs are obtained;
further, the bait nutrition regulation means that the parent fish bait is adjusted to mackerel, squid, oyster meat or mussel meat, the feeding rate is kept at 1-2% of the weight of the parent fish, and the parent fish is fed for 1 time a day;
the additive is lecithin and astaxanthin, and is added according to 1% of bait feeding amount, so that the nutrition of parent fish is increased, and the gamete quality is improved.
Through the reproduction regulation and control measures, the gonads of the parent fishes grow well and mature, and can naturally lay eggs in the culture pond in the regulation and control period of more than 60-70 days, so that high-quality fertilized eggs are obtained. The fertilization rate reaches more than 90 percent, the hatching rate reaches more than 70 percent, the spawning period is advanced by 1-2 months compared with the natural world, and the spawning period can be as long as 45-60 days.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention provides a natural spawning control method for parent fish of seriolala quinqueradiata, which is characterized in that a breeding group is established by preferably selecting high-quality parent fish, the parent fish is cultured by relay in the open sea, the parent fish is ensured to be stimulated in a high-temperature period in summer and a low-temperature period in winter, the parent fish grows under a condition closer to the natural condition, the culture quality of the parent fish is high, and the spawning control is guaranteed.
(2) The invention provides a method for regulating natural spawning of parent fish of seriolala quinqueradiata, which can lead the parent fish to better feel the natural environment through regulating and controlling simulated natural spawning conditions of water temperature and light period and adding the stimulation of water flow and nutrition strengthening measures, promote the gonad development and gamete growth, lead the effective accumulated temperature of the breeding water temperature of the parent fish to reach 1937 DEG, hour-2070 DEG, hour to reach the final mature spawning, realize the precise control of the reproductive regulation and spawning of the parent fish, and obtain high-quality fertilized eggs. In addition, through the setting of the dusk lamp and the stimulation of water flow, the spawning time of parent fishes can be induced to be relatively concentrated, and the collection and incubation management of fertilized eggs are facilitated.
(3) The invention provides a natural spawning control method for parent fish of yellowtail, which is characterized in that mackerel and bowled fillet are fed at ordinary times through controlling bait feeding amount and nutrition, and the parent fish is promoted to grow according to 3-5% of the weight. In the reproductive regulation and control period, the bait is adjusted to mackerel, squid, oyster meat or mussel meat, the feeding rate of the bait is reduced to 1-2%, the fat intake of parent fish is controlled, the visceral fat consumption is increased, the visceral fat accumulation is reduced, the full development and maturation of gonads are effectively promoted, and high-quality fertilized eggs are obtained.
Description of the drawings:
FIG. 12017 shows the change trend of the egg laying amount of parent yellow seriolae;
FIG. 22018 shows the change trend of the egg laying amount of parent yellow seriolae;
FIG. 32019 shows the change trend of the egg laying amount of parent yellow seriolae;
the specific implementation mode is as follows:
the technical solution of the present invention is further explained by the following embodiments with reference to the attached drawings, but the scope of the present invention is not limited in any way by the embodiments.
Example (b): a technique for cultivating and naturally spawning yellow seriolas parent fish of Dalianfu food Limited.
2017, 2019, researches on the cultivation and reproduction control natural spawning technology of yellow serila quinqueradiata in the Dalianfu cereal food Limited company for 3 years continuously, and the successful results are obtained continuously, so that high-quality fertilized eggs in batches are obtained, and the specific implementation process is as follows:
1. the parent fish is preferably selected
According to morphological and germplasm standards, the parent fish with normal body color, lively and healthy is preferably selected to establish a breeding population. The parent fish is over 4 years old, 120 tails of 4-year-old parent fish with the total length of 80-100cm and the weight of 5.5-8.0kg are preferably selected in 2017, and 2 breeding groups are constructed. And 70 tails of 4-year-old parent fishes are preferably added every year in 2018 and 2019.
2. Parent fish rearing
The parent fish is cultivated by two modes of an offshore net cage and land-based industrial running water.
8 days in 2016, 6 months in 2017, 4-5 days in 6 months in 2018, 9-10 days in 6 months in 2018, when the temperature of natural seawater reaches 18 ℃ or the spawning of parent fishes is finished, the parent fishes are transferred into a sea deep-water storm-resistant net cage to be cultured for summer, the net cage is square in metal structure, the specification of the net cage is 10m multiplied by 8m, and the culture density is 2-3kg/m3。
During the cultivation of the net cage, the parent fish baits comprise mackerel and bowled ammodytes mackerel, the feeding amount is 3-5% of the weight of the fish, and the parent fish baits are respectively fed for 1 time at 6 am and 4 pm.
Culturing conditions are as follows: the cultivation water temperature is 18-28 ℃, the dissolved oxygen is 7-9mg/L, the salinity is 30-33, and the growth of the parent fish is good.
20 days in 2017 and 10 months, 22-23 days in 2018 and 25-26 days in 2019 and 10 months, and when the temperature of the natural seawater is lower than 18-17 ℃, the parent fish is transferred to a land-based factory workshop for cultivation. 10m 2 m cement pond (effective volume 150 m) for parent fish in land-based factory workshop3) Internal cultivation, 60-70 fish parent are placed in each cultivation pool, and the cultivation density is 2-4kg/m3The sex ratio of male parent to female parent is 1: 1-1.5, and the water depth is 1.5 m.
The parent fish bait is fresh mackerel and bowled mackerel, and is fed according to 2-3% of the weight of the parent fish in the early overwintering period of 10-1 month every year, and is fed twice a day. Other culture conditions: the water temperature is 18-15 ℃, the cultivation is carried out in running water, and the water changing rate is 400-600%. Dissolved oxygen is more than or equal to 6.0mg/L, pH is 7.6-8.2, salinity is 28-33, and pond cleaning and water changing are carried out at regular time.
3. Reproduction-controlled natural spawning
Regulating and controlling the gonad development maturity of the parent fish by adopting the modes of artificial temperature and light control, water flow stimulation and nutrition enhancement and the like respectively in the 30 days in the 1 month in 2017, the 2 months in the 2 days in the 2018 and the 12 days in the 1 month in the 2019.
(1) Water temperature regulation
Starting from 30 days in 2017 and 1 month, 2 days in 2018 and 2 months and 12 days in 2019 and 1 month, the temperature of the parent fish culture water is regulated and controlled by using the boiler to heat and combining with a heat exchanger to recycle the waste heat of the water discharged from the workshop, and the temperature is gradually increased from 17 ℃ to 21 ℃ in a range of 0.5 ℃ per 10 days and is kept until the parent fish spawns. This temperature is maintained during the oviposition period until the oviposition is complete. The effective accumulated temperatures of the parent fish in the reproductive regulation period are 1970 degrees per hour, 1937 degrees per hour and 2070 degrees per hour respectively during three years.
(2) Photoperiod modulation
When the temperature of the parent fish is regulated, 5 LED lamps with white light sources are uniformly distributed above the parent fish breeding pond, and the power is 60W. The light intensity of the water surface is measured by a luminometer and is regulated to be about 350 lux. The LED and the like are communicated with the timer, the change of illumination time is adjusted by the timer, the artificial regulation and control of illumination is started at 7 points in the morning every day, the illumination time is gradually prolonged from 11 hours to 14 hours in 40 days every day, the illumination time is kept for 10 days, and then the illumination time is gradually shortened to 13 hours every day in 10 days until the parent fish spawns;
in addition, the LED lamp of the yellow light source is arranged above the LED lamp above the right middle of the parent fish culture pond, the power is 60W, and the intensity can be gradually reduced and extinguished within 15min under the regulation and control of the control switch. During the light period regulation and control, after other light sources are turned off, the brightness of the dusk lamp is regulated to be gradually reduced to the water surface illumination intensity of 100lux, the water surface illumination intensity is kept for 15min, and then the dusk lamp is turned off, so that the frightening and pool jumping stress behaviors caused by sudden light turning off of the parent fish are reduced.
(3) Stimulation of water flow
And on the next day after the parent fish starts to be subjected to temperature and light regulation, arranging 1 water pump with the power of 1.5kw in the parent fish breeding pond, fixing the water pump at one corner of the breeding pond, and controlling the water flow speed in the parent fish breeding pond to be 0.3-0.5m/s and the maximum flow speed to be 0.5m/s from dusk to dark.
(4) Nutrition fortification
2, in the early month, synchronously with the temperature and light regulation, adjusting the parent fish bait to be the mixed bait of mackerel, squid and oyster meat or mussel meat, wherein the feeding rate is 1-2% of the body weight, and the feeding is carried out for 1 time every day. Meanwhile, a nutritional additive mainly containing lecithin is added into the bait, and the nutritional additive is added into the oral part of mackerel according to 1% of the feeding amount of the bait, so that the nutritional supplement is used for increasing the nutrition of parent fish and improving the gamete quality.
2017 and 2019, through the reproduction regulation and control measures, the gonads of the parent fishes grow well and mature, the parent fishes naturally lay eggs in the culture pond after regulation and control for 74 days, 61 days and 77 days respectively, and the egg laying period is about 1-2 months earlier than the natural period. 13.6kg, 23.8kg and 108kg of high-quality fertilized eggs are respectively obtained in 2017 and 2019 (as shown in figure 1, figure 2 and figure 3), the average fertilization rate reaches over 90 percent, the hatching rate reaches over 70 percent, and sufficient high-quality fertilized egg guarantee is provided for seed culture. During the egg laying process, the number of floating eggs is small at the initial stage of egg laying, after about 15 days of egg laying, the floating egg amount is increased to enter the egg laying peak period, the floating egg amount is increased, the quality of the eggs is good, the fertility rate and the hatching rate are obviously improved, and the egg laying period lasts for 43-59 days.
Claims (3)
1. A method for regulating and controlling natural spawning of parent fish of Seriola quinqueradiata is characterized by comprising the steps of parent fish selection, parent fish cultivation and reproduction regulation and natural spawning;
1) selecting the parent fish: selecting active and healthy parent fishes with normal body color according to morphological germplasm standards to establish a breeding population; the parent fish needs to be over 4 years old, the total length is over 80cm, and the weight is over 7.0 kg;
2) the parent fish cultivation: the parent fish is cultivated by adopting two modes of land-based factory running water cultivation and offshore net cages; when the water temperature of the natural seawater is lower than 18 ℃, transferring the parent fish to a land-based factory workshop for overwintering cultivation, wherein the water temperature of the overwintering cultivation is 15-17 ℃; when the temperature of the natural seawater is higher than 18 ℃, transferring the parent fish to an offshore net cage for cultivation;
(1) the land-based industrial running water cultivation comprises cultivation facilities, cultivation density and sex matching, bait feeding and cultivation condition control;
the cultivation facilities refer to cement ponds or glass fiber reinforced plastic water tanks arranged in industrial cultivation workshops, and the effective water usage is 150m3The above; the parent fish breeding density is 2-4kg/m3The sex ratio of male parent to female parent is 1: 1-1.5;
the cultivation condition is controlled to be water temperature of 16-25 ℃; culturing with running water, wherein the water change rate is 400-600%, the dissolved oxygen is more than or equal to 6.0mg/L, the pH value is 7.6-8.2, the salinity is 28-33, and cleaning and changing water in a pond at regular time;
(2) parent fish offshore cage culture, which comprises culture facilities, culture density, bait feeding and culture conditions;
the marine net cage culture means that when the natural water temperature reaches more than 18 ℃ or the spawning of parent fishes is finished, the parent fishes are transferred to a marine deep-water wind wave-resistant net cage from a land-based industrial aquaculture workshop to be continuously cultured for summer;
parent fish marine culture conditions: the cultivation water temperature is 18-28 deg.C, dissolved oxygen is 7-9mg/L, salinity is 30-33, and parent fish cultivation density is 2-3kg/m3When the water temperature of the natural seawater is lower than 18 ℃, transferring the parent fish to a land-based factory workshop again for overwintering cultivation, wherein the water temperature of the overwintering cultivation is 15-17 ℃;
3) the reproduction regulation and control natural spawning: the reproduction control spawning refers to controlling the gonad development and maturation of the parent fish and natural spawning by controlling the conditions including water temperature, photoperiod, water flow and nutrition of parent fish culture;
(1) the water temperature control means that the water temperature for breeding the parent fish is artificially controlled from two months before spawning, the temperature is gradually increased from 17 ℃ to 21 ℃ in the range of 0.5 ℃ per week and is kept until spawning is finished, and the effective accumulated temperature in the reproductive control period of the parent fish needs to reach 1937 DEG Chour-2070 DEG Chour;
(2) the photoperiod regulation and control means that a white LED light source and a dusk lamp are arranged above a parent fish culture pond, and the gonad development of the parent fish is stimulated by manually controlling the illumination time;
arranging an LED lamp above the water surface of the parent fish culture pond, regulating the illumination intensity of the water surface to be 300-; the start time of the photoperiod regulation and control is synchronous with the regulation and control of the water temperature, the artificial regulation and control of the illumination is started at 7 am every day, the illumination time is gradually prolonged from 11 hours to 14 hours in 40 days, the illumination time is kept for 10 days, and then the illumination time is gradually shortened to 13 hours in 10 days until the parent fish spawns;
the dusk lamp is an LED lamp with a yellow light source arranged above the middle of the parent fish culture pond, the power of the dusk lamp is 60W, the dusk lamp can gradually reduce the intensity and extinguish within 15min under the regulation and control of a control switch, and the dusk lamp keeps for 15min after the brightness of the dusk lamp is gradually reduced to 100lux of illumination intensity of the water surface after other light sources are extinguished and then extinguishes;
(4) the water flow stimulation means that water flow is produced in the parent fish breeding pond; controlling the water flow speed within 0.3-0.5m/s, and setting the maximum flow speed in the time period from dusk to dark;
(5) the nutrition reinforcement means that the growth of gonads and gametes of parent fishes is promoted by the regulation of bait nutrition and additives from the beginning of reproduction regulation to 2 months before spawning, the gamete quality is improved, and high-quality fertilized eggs are obtained;
the additives are lecithin and astaxanthin and are added according to 1% of the bait feeding amount, so that the nutrition of parent fish is increased, and the gamete quality is improved;
through the reproduction control measures, the gonads of the parent fishes grow well and mature, and the parent fishes can naturally lay eggs in the culture pond within the control period of 60-77 days to obtain high-quality fertilized eggs.
2. The method for regulating natural spawning of parent fish of yellowtail according to claim 1, wherein the baits in the parent fish culturing stage comprise iced mackerel and bowled mackerel, the baits are fed according to 3-5% of the weight of the parent fish in daily management, the baits are adjusted to 1-2% before and after spawning, and the baits are fed twice daily.
3. The method for regulating natural spawning of parent fish of yellowtail according to claim 1, wherein the feed nutrition regulation in the nutrition enrichment during the reproductive regulation natural spawning stage is to regulate the feed of the parent fish to mackerel + squid + oyster meat or mussel meat, the feeding rate is kept at 1-2% of the weight of the parent fish, and the feeding is carried out for 1 time per day.
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| CN114375879B (en) * | 2021-12-29 | 2023-07-18 | 广东省鳇鲸海洋生物科技有限公司 | Cultivation method for promoting gonad development of parent yellow lip fish |
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| CN114651754B (en) * | 2022-04-08 | 2023-10-20 | 中国水产科学研究院黄海水产研究所 | Industrial cultivation method for Seriola quinquefolia seedlings |
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