1. When to release fry The best release time is from late May to mid-June. In addition, one or two months after the year and July and August are also good choices. The reason why fry are put in these periods is that the temperature is suitable, and fry can grow rapidly, which not only has a high survival rate, but also has a shorter time out of the pond, which can create higher economic benefits. In addition, it is best to put it on a sunny day.
Second, how to feed fry 1, feeding: First of all, pay attention to feeding, you can absorb yolk sac when you just hatch, and you need to start feeding after 2-3 days. The most suitable food for fry is backwater, that is, plankton such as rotifers and ciliates. If not, you can also feed the egg yolk, but you should wrap it in gauze and crush it, then pat it on the water and move it while patting it so that the egg yolk floats evenly on the water. Usually feed it twice a day and eat it clean within one hour after feeding.
2, change water: because the amount of food fed to fry is not easy to control, it is easy to feed more, and it will affect the water quality for a long time, so change the water regularly. Dehydration is often used to change water for fry and pour it into new water together with old water. Usually, the first dehydration is needed after hatching 10- 15 days, and then it can be changed once every half month and dehydrated three times continuously.
3. Water accumulation: As the fry grow up slowly, it is necessary to select fish for the pond, remove the fry with single tail, deformed tail and abnormal tail handle, and then put them in the pond according to the density of 150 fish per square meter. When the fry grows to 2 cm, it is necessary to select the fish for the second time, eliminate the fish without 3 or 4 tails, and eliminate the fish with poor dorsal fin development for the third time.