Artificial breeding mainly includes broodstock breeding, drug eliciting and artificial hatching.
First, broodstock breeding
1. Ratio of broodstock sources to male-female ratio In the case of adult fish harvested from reservoirs or ponds in lakes, it is advisable to keep corpses that are sturdy and have complete squamaes and s It can also be produced by breeding fish. When selecting broodstock, pay attention to the proportion of males and females. Males are required to be slightly more than females, and the male to female ratio is generally 1:1.5 to 2.5.
Males and females are distinguished mainly by the shape of the pectoral fins, the number of beads and the size of the abdomen.
2. Broodstock Breeding Broodstock collected in the spring of the year can generally be matured through short-term cultivation. Regardless of the size of the fish pond, single or rearing can achieve good results. The area of ​​the cultivation pond is generally about 1 mu, and the water depth is maintained at 1.2m. Stocking 100-150kg of the group head, and appropriate breeding 4-6 pigtails to regulate water quality. In the early spring, when the broodstock broodstock passed wintering, the body weight was slightly reduced, and the green feed was still very little at this time. The feed should be mainly fed with concentrated feed to restore the fish body as quickly as possible. After the aquatic grasses and grasses grow, they are gradually changed to green feed. In this case, the ratio of refined and green feed is about 1:1.6. The feed is stopped 15-20 days before the birth. The concentrated material is bean cake, malt, etc. The green material is Vallisneria, Hymenocallis, lettuce leaf, etc. The amount of feed is 4-6 hours per day, and each broodstock has 1 day of concentrate, up to 25-30 g. The pool should often be filled with new water to promote gonadal development. Close to the spawning period, when the water temperature reached 16-17Y, the male and female fish should be separated to avoid sporadic production of the broodstock, affecting the normal production.
Second, the pro-fish drug production in the production, the general use of drugs to stimulate production for reproduction. The gonads should be injected with selective gonads that are well-developed. The main types of oxytocin are peony, pituitary pituitary, human chorionic gonadotropin, and LRH-A. With the pituitary dose of female fish per kilogram of body weight 6-8, mg fruit better chorionic effect with 600 international units better, LRH-A to 60-100ug better male fish halved. A thoracic injection method is generally used for oxytocin production. When the water temperature is 24-26°C, the effect time is about 8 hours.
Third, artificial insemination and de-adhesion heads? Egg viscosity is weak, with the nest nest and egg hatching easy to fall off affect production, for which artificial fertilization and de-adhesion method can be used to obtain fertilized eggs. After the broodstock was injected with aphrodisiac, the male and female broodstock chased intensely after about 8 hours. At this time, a dry basin can be prepared in advance, then the estrous brooding male and female brood fish are caught, and the body surface water is wiped with a wet towel, then the egg and semen are Squeezing in the basin, while squeezing into the semen, gently stir with a frizz to allow full contact with the sperm and eggs. After agitating for 1-2 minutes, slowly pour the egg into the pre-prepared talcum powder degumming solution, each 10L. Talc powder degumming solution can lay eggs 1-1.5kg, to feather the edge of the inverted egg side, so that the egg is fully dispersed in the degumming solution, need to stir 5-10 minutes, and then release the hatching equipment of human grass, carp hatching equipment .
four. After the artificial hatching and debonding, the head abalone eggs can be hatched in the hatching tank, and the egg density is 5-10 million grains per 100 kg of water. It can also be hatched in the hatching ring, and the egg density is 700-800 thousand grains. /m2, due to the small size of the eggs, the proportion of larger, so the flow should be more appropriate than grass, salmon eggs hatching water flow, to prevent the death of the sinking. Usually when the water temperature is 25-26 cC, it can be hatched within 1-2 days. After the film is grown 4-5 days to 6-6.5 mm, when the waist point appears, the number of seedlings can be increased and the lower pond can be reared or shipped.
First, broodstock breeding
1. Ratio of broodstock sources to male-female ratio In the case of adult fish harvested from reservoirs or ponds in lakes, it is advisable to keep corpses that are sturdy and have complete squamaes and s It can also be produced by breeding fish. When selecting broodstock, pay attention to the proportion of males and females. Males are required to be slightly more than females, and the male to female ratio is generally 1:1.5 to 2.5.
Males and females are distinguished mainly by the shape of the pectoral fins, the number of beads and the size of the abdomen.
2. Broodstock Breeding Broodstock collected in the spring of the year can generally be matured through short-term cultivation. Regardless of the size of the fish pond, single or rearing can achieve good results. The area of ​​the cultivation pond is generally about 1 mu, and the water depth is maintained at 1.2m. Stocking 100-150kg of the group head, and appropriate breeding 4-6 pigtails to regulate water quality. In the early spring, when the broodstock broodstock passed wintering, the body weight was slightly reduced, and the green feed was still very little at this time. The feed should be mainly fed with concentrated feed to restore the fish body as quickly as possible. After the aquatic grasses and grasses grow, they are gradually changed to green feed. In this case, the ratio of refined and green feed is about 1:1.6. The feed is stopped 15-20 days before the birth. The concentrated material is bean cake, malt, etc. The green material is Vallisneria, Hymenocallis, lettuce leaf, etc. The amount of feed is 4-6 hours per day, and each broodstock has 1 day of concentrate, up to 25-30 g. The pool should often be filled with new water to promote gonadal development. Close to the spawning period, when the water temperature reached 16-17Y, the male and female fish should be separated to avoid sporadic production of the broodstock, affecting the normal production.
Second, the pro-fish drug production in the production, the general use of drugs to stimulate production for reproduction. The gonads should be injected with selective gonads that are well-developed. The main types of oxytocin are peony, pituitary pituitary, human chorionic gonadotropin, and LRH-A. With the pituitary dose of female fish per kilogram of body weight 6-8, mg fruit better chorionic effect with 600 international units better, LRH-A to 60-100ug better male fish halved. A thoracic injection method is generally used for oxytocin production. When the water temperature is 24-26°C, the effect time is about 8 hours.
Third, artificial insemination and de-adhesion heads? Egg viscosity is weak, with the nest nest and egg hatching easy to fall off affect production, for which artificial fertilization and de-adhesion method can be used to obtain fertilized eggs. After the broodstock was injected with aphrodisiac, the male and female broodstock chased intensely after about 8 hours. At this time, a dry basin can be prepared in advance, then the estrous brooding male and female brood fish are caught, and the body surface water is wiped with a wet towel, then the egg and semen are Squeezing in the basin, while squeezing into the semen, gently stir with a frizz to allow full contact with the sperm and eggs. After agitating for 1-2 minutes, slowly pour the egg into the pre-prepared talcum powder degumming solution, each 10L. Talc powder degumming solution can lay eggs 1-1.5kg, to feather the edge of the inverted egg side, so that the egg is fully dispersed in the degumming solution, need to stir 5-10 minutes, and then release the hatching equipment of human grass, carp hatching equipment .
four. After the artificial hatching and debonding, the head abalone eggs can be hatched in the hatching tank, and the egg density is 5-10 million grains per 100 kg of water. It can also be hatched in the hatching ring, and the egg density is 700-800 thousand grains. /m2, due to the small size of the eggs, the proportion of larger, so the flow should be more appropriate than grass, salmon eggs hatching water flow, to prevent the death of the sinking. Usually when the water temperature is 25-26 cC, it can be hatched within 1-2 days. After the film is grown 4-5 days to 6-6.5 mm, when the waist point appears, the number of seedlings can be increased and the lower pond can be reared or shipped.