Autumn management techniques for fish species

In autumn, it is cold and warm at first, and the water temperature is suitable, which is the peak season for the growth of fish species. Doing well the management of fish species in autumn is a direct means to improve economic benefits. The author believes that the management technology of fish species in autumn should do a good job in the following work.

First, clear the pond in time. In ponds where fish fry are cultivated for 23 months, generally speaking, the water quality will age, natural bait will decrease, and harmful substances such as hydrogen sulfide and pathogens will increase. After entering autumn, the fish species should be transferred to the pond which has been cleared and poisoned for cultivation. Where there are difficulties in the turnover of water sources and fish ponds, all the fish can be transferred out of temporary culture, and then sterilized with 75-100 kg of quicklime per mu of the original pond, and fertilized in water according to the conventional method, and then transferred back to the fish after the medicine disappears, so as to ensure the purification of the living environment.

Second, scientific bait. Due to the suitable climate in autumn, large food intake and rapid growth of fish species, the supply of feed must be ensured. In the fish ponds dominated by herbivorous fish and matched with silver carp and bighead carp, green feed should be used and concentrate should be fed properly. Every ten thousand grass carp fingerlings are fed 70-90 kg of duckweed, tender dry grass or aquatic plants and 1.5-2.5 kg of concentrate feed every day.

First put in green feed, then concentrate feed to avoid grass carp competing with other fish for food. Bait should be guaranteed, quantified, timed and positioned. The mixed-cultured silver carp and bighead carp should be fertilized regularly, once every 10-15 days, 70-90 kg of fermented human and animal manure per mu, and the transparency of the pond water should be kept at 30-35 cm. The fry ponds with silver carp and bighead carp as the main species and grass carp should be fertilized and supplemented by bait. In addition to applying base fertilizer, topdressing is applied every 5-10 days, with 80-100 kg of mature human and animal manure per mu. At the same time, concentrate feed is 2-4 kg per ten thousand fish every day. For grass carp, 6090 kg of green feed is given to every 10,000 grass carps before putting in concentrate feed.

Third, separate cultivation management. Fish species should be reared reasonably according to different specifications, so that the specifications of fish species in the same pond are the same. Because the large size fish has a large food intake and strong grabbing power, if there are small size fish at the same time, the small fish will not get enough feed and their physique will decline. Fish species of more than 16 cm can be placed in adult fish ponds, and small fish species need to be cultivated in a special pond, so as not to lead to competition for food, resulting in the extreme phenomenon that the strong are stronger and the weak are weaker.

Fourth, patrol the pool regularly. During the period of fish breeding, we should patrol the pond every day, observe the food intake and living conditions of fish, pay attention to the changes of water quality, change new water frequently, and add new water once a week. And often clean the food farm, remove the residue bait in time, sprinkle 0.5 kg of bleach around the food farm every semimonthly, and feed the bait regularly, preferably twice a month for 3 consecutive days. When diseased and dead fish are found, they should be fished out and buried in time, diagnosed and treated with drugs at the same time.

Fifth, reasonable sparse. The breeding of larger fish species in autumn is an important link to improve the overwintering survival rate of fish fingers. it should be sparse reasonably according to the size and depth of water surface to promote the growth of fish species. In a pond with a depth of 1.5m, there are 4000-6000 fish species of 7-8cm per mu, and the body length can reach 1317cm by the end of the year, which plays a very important role in improving the income of aquaculture.