Experience of artificial propagation of cultured carp in autumn
Carp can reproduce in spring and autumn, but mainly in spring in the conventional production process. With the development of fishery production and the change of production mode, only breeding fish fry in spring is far from being able to meet the needs of fishery production, so our farm has achieved good results in spring and autumn according to market demand. Autumn carp fry propagation techniques are introduced below for your reference.
Artificial propagation of carp fry by using family larvae running water fish culture pond in autumn can meet the needs of spring stocking, shorten the fry culture cycle and increase the yield. There are five techniques for artificial propagation of carp fry in autumn:
First, choose a mature fish that weighs more than 500 grams. The abdomen of the female carp is dilated and soft, the anus and reproductive foramen are red and swollen and congested; the male carp squeeze its abdomen with white semen, and there is no swelling near the anus.
2. After the male and female species are selected, the ratio of 1 to 7 is used for collocation. If you release more male carp, it can accelerate the estrus of female carp.
Third, suspended water spawning female and male fish in the fish basket for hanging water, and placed the nest, the back of the fish is about 3 cm below the surface of the water, in order to use differential temperature stimulation and micro-water stimulation to achieve its spawning. If 2 ml of 50% glucose is injected into the scale-free base of the pectoral fin of each female carp, the effect of spawning is better.
Fourth, incubation instructions ① spawning pond and incubator water should not be overfertilized. If the water is more fertilizer will cause the floating head of fish, do not spawn or spawn can not hatch due to the influence of fertilizer and water hypoxia, spawning pond and incubator should be injected with new water, it is better to keep micro-running water. The suitable water temperature is 18-22 ℃. ② spawning nest with root refreshing, not mixed with false daffodils, to cut off the stems and leaves, so as not to stick fish eggs to death by the sun. ③ prevents male fish from eating eggs and improves hatching rate.
Fifth, artificial aphrodisiac to carp can make carp lay eggs on time and increase the number of eggs.
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