In the autumn, the artificial breeding of eel fry using family clams and aquaculture ponds can adapt to the needs of spring stocking, shorten the fry cycle and increase yield. There are five tips for the artificial breeding of salmon in autumn:
One, fish selection
To select a mature fish that weighs more than 500 grams. The female squid has to enlarge and soften the abdomen, redness and congestion around the anus and genital holes; the male squid squeezes the abdomen with white semen outflow, and there is no swelling near the anus.
Second, male and female
After selecting the male and female fish, mix them in a 1:5-7 ratio. If you put more squid, you can speed up the estrus of female squid.
Third, hanging eggs and spawning
The male and female fish were placed in a fish cage to suspend water and a fish nest was placed. The fish back was approximately 3 cm below the surface of the water in order to utilize differential temperature stimulation and microfluidic water stimulation to achieve spawning. If 2 ml of 50% glucose is injected at the base of each pectoral fin of the female, the effect of spawning is better.
IV. Incubation Instructions
1 Don't overdo your spawning and hatching pond water. If the water is more fat, it will cause the floating head of the fish, no spawning or spawning grains will be formed due to lack of oxygen in the fertilizer and water. The spawning pool and the hatching pond should be filled with fresh water, and it is better to keep the microfluidic water. The water temperature is preferably 18-22°C.
2 The production of ovaries should be smooth with roots, and false narcissus without mixed pulp is better. Cut stems and leaves to avoid sticking the eggs to sunlight. 3 Prevent males from eating eggs and increase hatching rate.
Fifth, artificial aphrodisiac
Artificial aphrodisiac for squid can make squid spawn on time and increase egg volume. The specific method is: In the salmon breeding season, the mature females are injected with 50% glucose solution, the injection site is the base of the pectoral fin without fins, the injection angle is 45 degrees, the injection volume is determined by the female body weight, and each injection is 3- 5 ml. After the injection, the female parent fish is placed in the spawning pool, and then each female fish is equipped with two male fish. The spawning pool can be used for domestic fish breeding, keeping microfluidic stimulation, and spawning can be started within 10-15 hours after injection. The amount is generally about 40% higher than natural ovulation. The eggs of the squid are sticky eggs and need to be set up to produce ovaries. The ovaries use narcissus roots or aquatic plants, the eggs are attached to the fish nests, and the nests with the eggs are put into the saccharinized fish larvae for hatching. . It has been proved by practice that there are three benefits of using glucose as an artificial aphrodisiac to propagate salmon fry:
1 The method is simple, low in cost, and suitable for widespread promotion in rural areas.
The spawning of two kinds of fish is centralized and easy to manage.
3 The size of the fry is even and the fish body is strong. The survival rate after stocking is high and the growth is fast, which can win high yields.
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