Hu Yuandi is a breeding farmer of field fry in Qianyi Village, Shangtang Town. From April 1st to April 5th this year, 2 batches have been propagated, and more than 2.5 million fertilized eggs have been obtained. The quality of fish eggs is good. At present, the hatching is hatching indoors. On the afternoon of the 5th, the author went to Yuandi Field to understand the breeding situation of Tian fish. After listening to the introduction, he felt that the younger brother had a good experience and was recommended to the general households for reference when breeding the fish.
First, the use of cages for field fish spawning pool is convenient and practical, easy to scale production. The method of the younger brother is to set a long net cage, 25 meters long, 1.3 meters wide and 1.1 meters high, in a well-sterilized field pond. The underwater part is about 30 centimeters, and then it is partitioned into 5 pieces with bamboo bars. The small cages are 2.5 meters long and have the same width and depth. The cages are covered with nets to prevent birds from damaging fish. During breeding, 10 to 12 female fishes are placed in each small box, and 15 to 20 male fishes, depending on the size of the broodstock. If you have more broodstock, you can add cages temporarily. According to the younger brother, this method is convenient and practical, and can produce fish eggs in batches. In the first batch of breeding this year, five small cages were used, and 76 kg of broodstock were counted for 120 fishes. When the second spawning was performed, 4 cages were used and 92 kg of broodstock were thrown, accounting for 138 fish. The scale of reproduction was large, and it was rare in the whole county.
Second, the fish nest should be properly placed. Fish nests are materials that adhere to fish eggs. In the Yongjia mountain area, fish farmers generally use the fern “Over Mountain Dragon†as a fish nest. According to the younger brother, the fresh “Long Shan Long†floats well and will not sink in the tank. If it takes too long, it will sink. Use bamboo poles or bamboo bars to hold them. To place "over-mountain dragons", the branches and leaves must be spread to expand the area, which is conducive to the even distribution of fish eggs. The method is to use a plastic wire to tie the branches so that the branches can maintain a certain distance, and they can naturally open under the action of buoyancy. If piles are in the water, Zhang does not open, it will cause the eggs to pile up, and the distribution will not be uniform. Affect the hatching rate. It is not advisable to place too many too many dragons in cages.
Third, fish eggs before hatching should be disinfected to prevent saprophytic disease. The method of the younger brother is to have a disinfectant at the side of the hatchery and take the nest of fish eggs in the disinfecting solution and then take it to the room for incubation. If the temperature is low and the incubation time is long, soak in the bath again on the second day; if the temperature is high, do not have to take a second medicine bath so as not to affect the hatching of fish eggs. The disinfectant he uses is malachite green purchased by the Wenzhou Bird and Bird Market. It is a banned fishery drug, but it is still allowed in the disinfection of fish eggs. According to him, the drug has been used for many years and it works well.
Fourth, breeding male fish should not be too large, generally about 0.5kg better. If the fish body is too large, the mating is inflexible, which affects the fertilization rate. According to him, the fish that had previously been bred with heavy males had resulted in fish seeds being “not brooded†(the fertilization rate was not high). In recent years, he has used about 0.5 kg of male fish for mating, which is very effective.
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