What are the key points of adult fish farming management after the beginning of autumn

After the beginning of autumn, the water temperature begins to drop, and the fish gradually feed vigorously again. This is also a golden period for fish production and growth, so management should be strengthened. The following key points should be grasped in particular:

First, strengthen bait feeding. At this time, feeding should focus on concentrated feed, with emphasis on fattening the bottom-feeding fish. At the same time, attention should be paid to the combination of varieties in concentrated, coarse and roughage feeds to ensure that the fish feed is fully and comprehensively nutritious. Grass carp should be properly fed green grass, black carp should be fed snail feed, and silver carp and bighead carp should also be properly fertilized. After the beginning of autumn, fertilizer should be applied in small amounts and frequently, mainly inorganic fertilizer, and it should also be specifically controlled according to the condition of the fish, the fertility of the water, the weather, and so on.

Second, reasonably regulate water quality. (1) Add and change new water, generally adding water 4 to 5 times a month, 1 to 2 hours each time, with the water amount at 5% to 10%. (2) Splash quicklime. Quicklime can neutralize hydrogen ions, increase calcium, increase water fertility, and at the same time disinfect and sterilize to prevent and treat diseases. Generally once every half month, 20 to 25 kg per mu each time.

Third, harvest in a timely manner and pay attention to daily management. After the beginning of autumn, some fish have reached commercial specifications. If feeding continues, they eat a lot and grow slowly, so they should be harvested and sold in a timely manner to reduce the density of fish in the pond and accelerate the growth of fish that have not yet reached specifications. Through the accumulation of loading and unloading, more and more organic matter is deposited at the bottom of the pond. If the weather changes, it will cause pond suffocation, so the activity of the fish should be observed in a timely manner.

Fourth, prevention and treatment of fish diseases. After the beginning of autumn, fish are very prone to complications of bacterial gill rot and enteritis. In practice, local farmers use a mixture of rapeseed oil and ginger to treat complications of bacterial gill rot and enteritis in grass carp, with remarkable curative effect. The formula of this medicine is introduced as follows: each mu of pond needs 750 grams of rapeseed oil and 250 grams of ginger. First put the rapeseed oil into a pot and heat it until cooked, then pour the ginger cut into small pieces into the oil pot and simmer for 20 minutes, then scoop it out, put it into a bucket, pour in an appropriate amount of water, and stir it so that it is fully mixed, then it can be splashed over the whole pond, especially beside the feeding rack frame. Use the medicine once a day, or once every other day, and splash it twice in succession. Three points should be noted when using it: that is, the splashing should be uniform; choose a sunny day to carry out the operation; change the water five days after splashing (especially in hot weather, change the water particularly frequently).