How to raise black fish fry

Black fish is a kind of precious freshwater fish with high nutritional value and is known as "the treasures of fish". At present, it is mainly distributed in the Yangtze River Basin and Heilongjiang River. of course, there are also farming in other areas. How to raise black fish fry?

1. Pond construction

According to the number of fish fry in reservoirs, lakes and other places to build a suitable size of the pool, generally in the east-west direction to build a rectangular pool is best, the pool depth is about 2.5, the water depth is about 2 meters. Then put some mud at the bottom, surround it with a protective net, and disinfect the pond with 150 kilograms of quicklime per mu 15 days before stocking.

2. Fish restocking

Go to the store to buy some healthy seedlings, then soak in 3%-5% salt water for about 15 minutes, and finally put it in the pool. Generally speaking, it is almost enough to breed 9000,000 and 10000 horses per mu.

3. Daily management

(1) observe the growth of fish frequently: during the period of culture, you should look at the pond frequently, observe the feeding and activity of fish, and deal with it in time once you find something abnormal.

(2) Water quality requirements: in spring, the pool water is changed every other week by 4ppm, a small change every 3 days and a big change every 7 days in the high temperature season, so that the water quality is good.

(3) feeding requirements: try to feed some small fish, shrimps, larvae, etc., the initial feeding amount is 10% of the body weight, and then it can be reduced to about 5% of the body weight. It should be fed one spoon after another, so that the waste of feed is less. In the later stage, the feeding amount will be increased.

(4) Prevention of diseases: during the growth of black fish, there will be rotifer, iodine vesicular disease, hemorrhagic septicemia, skin rot and other diseases, so prevention and control measures should be taken in advance.