First, we should grasp the best time for the election of the broodstock fish in the best choice before the Spring Festival when the adult fish left. At this time, the food intake of the fish is reduced, the activity is slow, and the scales are tight and not easily injured.
Second, pay attention to the appropriate age, physical fitness and weight The age of cultured fish to mature: squid 3-4 years of age, squid, grass carp 4 to 5 years old, herring 6 years old, pupa, pupa, pupa 2 instar. At the same time, broodstock should be selected for fish with robust physique, complete scales and fins, and no disease or trauma. Under normal circumstances, the broodstock weight is: 3 kg of carp, 8 kg of carp, 7 kg of grass carp, 1 kg of pupae, pupae, and pupae.
Third, gonadal development must meet the requirements of the preparation of selected broodstock gonads (ovaries or testes) development must reach the third phase. From the appearance, there are obvious ovary bulges on both sides of the abdomen of the broodstock.
Fourth, male and female with a reasonable ratio of 1:1 male and female fish. According to the characteristics of the pectoral fins, scales and other characteristics of the fish to identify male and female fish. (a) Grass carp. The pectoral fins are small and dense at the base of the scales, slightly pointed, long and narrow fins, males with rough feel during the reproductive season; the scales at the base of the pectoral fins are large and thin, slightly rounded, the rays are short and wide, and the fins during the reproductive season There are no small bumps on the quilt and the smooth hand is the female. (b) Herring. The pectoral fins are large and long, and the fins on the fins of the reproductive season are very dense with small white particles. The males with rough hands feel rough; the weights are quite small, the pectoral fins are short, and there are no small particles in the reproductive season, and the females with smooth hands feel smooth. (c) Squid. The pectoral fins (third fins) were held by hand and the males were found to have rough thorns on their hands. The females were found to have smooth fins or coarse fins on their ends. (d) Carp. The hand touched his pectoral fin with a shave-feeling feel for the male fish, and the hand touched the pectoral fins for a very smooth feel for the female fish.
In addition, some 2 to 3 instar female fish or male fish may be reserved in adult fish in advance, and left as broodstock, and then male or female fish may be allocated accordingly.![]()
Second, pay attention to the appropriate age, physical fitness and weight The age of cultured fish to mature: squid 3-4 years of age, squid, grass carp 4 to 5 years old, herring 6 years old, pupa, pupa, pupa 2 instar. At the same time, broodstock should be selected for fish with robust physique, complete scales and fins, and no disease or trauma. Under normal circumstances, the broodstock weight is: 3 kg of carp, 8 kg of carp, 7 kg of grass carp, 1 kg of pupae, pupae, and pupae.
Third, gonadal development must meet the requirements of the preparation of selected broodstock gonads (ovaries or testes) development must reach the third phase. From the appearance, there are obvious ovary bulges on both sides of the abdomen of the broodstock.
Fourth, male and female with a reasonable ratio of 1:1 male and female fish. According to the characteristics of the pectoral fins, scales and other characteristics of the fish to identify male and female fish. (a) Grass carp. The pectoral fins are small and dense at the base of the scales, slightly pointed, long and narrow fins, males with rough feel during the reproductive season; the scales at the base of the pectoral fins are large and thin, slightly rounded, the rays are short and wide, and the fins during the reproductive season There are no small bumps on the quilt and the smooth hand is the female. (b) Herring. The pectoral fins are large and long, and the fins on the fins of the reproductive season are very dense with small white particles. The males with rough hands feel rough; the weights are quite small, the pectoral fins are short, and there are no small particles in the reproductive season, and the females with smooth hands feel smooth. (c) Squid. The pectoral fins (third fins) were held by hand and the males were found to have rough thorns on their hands. The females were found to have smooth fins or coarse fins on their ends. (d) Carp. The hand touched his pectoral fin with a shave-feeling feel for the male fish, and the hand touched the pectoral fins for a very smooth feel for the female fish.
In addition, some 2 to 3 instar female fish or male fish may be reserved in adult fish in advance, and left as broodstock, and then male or female fish may be allocated accordingly.
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