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The area of ​​the broodstock cultivation pond is 20-100m2, water depth is 1.2m or more, and the pool is surrounded with mesh or film to prevent fish escape. Cultivate the water surface of the pond to 1/3 to 1/2 of the stocking water hyacinth. Put bamboo and other objects in the pond to give the broodstock a suitable habitat. 15 days before the parent pools, use the quicklime or strong chlorine to sterilize the pool water. Disinfect with 5% saline and put it in the pool.
Before the wintering, the broodstock was fed with appropriate feed, and the feed amount was 1% of the fish's body weight. During this period, special attention should be paid to the activities of fish to prevent the parents from chasing each other and biting. If any fish is found to have been bitten, it should be applied in time to prevent the occurrence of watery mildew. Intensive cultivation shall be conducted one month prior to breeding. At this stage, fresh water shall be maintained and high-quality feed such as fish, duck liver, beef liver, cocoon and other animal feed shall be fed, and the amount fed is 3% to 5 of fish’s body weight. %. During the entire cultivation period, the environment should be kept quiet, and new water should not be added too quickly or too much.
2, the parental broodstock rearing period, standing on the edge of the pool observation, you can see the back of the female's back clear ovary outline; catch check, male abdomen with light pressure on the abdomen, the female abdomen enlargement, loose. Pairing broodstock at this time has a higher success rate. After the broodstock matures, the male and female fish are separated, and then the similar male and female fish are paired into a spawning pond and a small amount of water hyacinth is placed on the water surface. The spawning ponds can be water tanks, plastic buckets, and artificially built small pools. The water volume is 1 meter 3, and the water depth is about 60 centimeters. Put a bamboo tube into the water. After the broodstock is put into the spawning pool, it is necessary to observe it on the night and observe it once every 1-2 hours. It is found that the fish in the pool is jumping and fighting, indicating that the pairing is not successful. The females should be replaced in time, and the other one should be selected. Until it is ready. The entire matching process is 3 days to 1 week. If a fight is found without replacing the female or the male fish, the two-tailed fish will continue to fight until one side dies or ends up in the same room; after the pairing is completed, if there is a third party intervening, it will also fight and only one will remain. Or all died.
3. After spawning and hatching parents are properly paired, feeds should still be fed daily and every morning should be checked for egg production. In order to ensure the quality of seedlings, natural spawning should be adopted instead of artificial labor. Moons are generally spawned under water hyacinth, so check more and remove them before the eggs are broken. Eggs are taken with a bowl or a small bowl and the movement is light. After the eggs are removed, they are collected in a bucket and washed with malachite green for 3 to 5 minutes. The drugs are then washed and placed in plastic pots. About 5000 eggs can be placed in each pot.
The incubation time of the fertilized eggs is 36-48 hours, keeping the water temperature relatively constant, and changing the fresh water once a day. Before changing the water, use chicken feathers or a straw to pick out the unfertilized eggs to prevent watery mildew; after hatching, change the egg shells before changing the water and then change the water. In this way, at a water temperature of 25°C, hatching can occur 36 hours after hatching.
Nursing fish breeding and breeding technology
1. Selection and breeding of parents Parents can be selected from the market or from self-cultivated fish. The standard for selecting broodstock is that the tail weight is more than 150 grams, and it is more than two years of age, and the age and individual are not much different. When selecting broodstock, the ratio of male to female is generally 3:2.
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