The number of fry ponds: The number of fry is generally around 100,000 per 0.067 hectare. The eel and squid may be more appropriate, grass carp may be less, and the fertilizer pond may be more dense. Xintang and the thin pool should be thinned appropriately. . When the fry is reared for about 20 days, it will grow to 3.3 centimeters, which is called summer fish species. At this time, it is necessary to carry out the first sub-separation of ponds, generally 1 to 15,000 per 0.067 hectare. After about 30 days of cultivation, summer flowers grow to about 6.6 centimeters, and the second time they are divided into ponds, it is better to put 5,000-8,000 tails per 0.067 hectares, and after 50 days of cultivation, when the fish species reach 10-13 centimeters, To carry out the third sub-distribution, put 3000-4000 hectares per hectare, so that by the end of the year, if cultivated and managed well, 200-250 kilograms of large species of fish can be bred per hectare, and the specifications can generally be more than 17 cm. Once down the pond, a pond raised in the end, it is best to put 5000-6000 summer flowers. The density of stocking must also be appropriately increased or reduced by the number of stocking fishes according to the conditions of the mountain and ponds, the amount of feed, and the level of management.
How to identify the quality of fry?
Due to the difference in the quality of fish eggs and various reasons in the egg hatching process, it can cause strong or weak constitution of the fry. Generally, we can use the following methods to identify:
1 Stir the water in the hatching tank to create whirlpools. If the fish fry back against the water, it means that the fish are healthy. If most of the fry are caught in the whirlpool and cannot resist, it means that the fries are of weak constitution. 2 Put the fry in a white porcelain basin and blow the surface of the water. If the fish swim in the wind and the water, they will have a healthy body and vice versa. 3 Put the fry in white shallow basins and pour the water. The fry is struggling strongly in the pelvic floor. The heads and tails are bent into loops, indicating that the physique is healthy. However, those who are struggling to stick to the pelvic floor are poor in head and tail tremors. .
In general, the fry are fresh and plump, well-shaped and well-balanced, and swimmers are good-quality and high-quality fry, but conversely are fragile fry.
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