Management of fish species in autumn

㈠ cleans the pond. After entering autumn, the fish species should be transferred to the pond which has been cleared and sterilized for cultivation, so that the fish species can survive the winter safely. Where there are difficulties in the turnover of water sources and fish ponds, all the fish can be temporarily reared, disinfect the original pond with 75-100 kg of quicklime per mu, fatten the water according to the conventional method, and return the fish to the fish after the drug disappears.

Separate cultivation of ㈡. It is necessary to make sure that the specifications of the fish species in the same pond are consistent. Large size fish species have large food intake and strong grabbing power. If small size fish species are put at the same time, small size fish species can not get enough feed, and their physique will decline. More than 16 centimeters of fish species can be put into fish ponds, while small fish species can be cultivated in special ponds.

㈢ is sparse. In order to improve the survival rate of fish species overwintering, it should be sparse reasonably according to the water surface size, water depth and other conditions. In a pond with a depth of 1.5 meters, 6000 fish species with a length of 7-8 centimeters per mu will be raised to the end of the year, with a body length of 13-17 centimeters.

㈣, take the bait. In the fry ponds where grass carp are mainly raised, chain and bighead carp are matched, green fodder should be used and concentrate should be properly fed. Every ten thousand grass carps are fed 70-90 kg of duckweed or aquatic plants and 1.5-2.5 kg of concentrate feed, first green feed and then concentrate feed to prevent grass carp from competing with other fish. Silver carp and bighead carp that can be mixed should be fertilized regularly, once every 10-15 days, and 70 kilograms of fermented human and animal manure should be applied per mu. The transparency of the pool water is maintained at 30m / m / m / m. In the fish pond dominated by chain and bighead carp and matched with grass carp, fertilization should be given priority to and bait should be supplemented. In addition to applying base fertilizer, topdressing is applied every 5-10 days, with 80 kilograms of mature human and animal manure per mu. At the same time, 4kg of concentrate feed is given to every ten thousand fish every day. For grass carp, 60-90 kg of green feed is suitable for every 10, 000 grass carps before putting in concentrate feed.

㈤ patrolling the pond. Keep patrolling the pond every day, observe the feeding and activities of fish species, pay attention to the changes of water quality, and add new water once a week. The food farm should be cleaned frequently, remove the residual bait in time, and sprinkle 0.5 kg of bleach around the food farm every half a month. Bait medicine is given regularly. It is best to feed twice a month for three consecutive days. Timely diagnosis and treatment of fish disease.

㈥ protects against cold. First of all, it is required to keep the overwintering pool water at about 2 meters; secondly, the water quality must be kept fertile, and in warmer sunny days, a small amount of bait is needed, especially grass carp, herring and carp.