How deep is the water for raising grass carp?

The water depth of grass carp is about 2-2.5m, and the ponds with an area of about 10-20 mu and silt thickness less than 20cm can be selected, the pond should be cleaned and disinfected well before releasing seedlings, high-quality seedlings should be selected, an automatic feeding machine and an aerating machine can be equipped every 10 mu, and reasonable feeding methods can be adopted to control the occurrence of fish disease.

1. How deep is the water for raising grass carp

Select the pond with a water depth of about 2-2.5 m, an area of 10-20 mu and a silt thickness smaller than that of 20cm. Equipped with an automatic bait feeding machine and a 3KW aerator, equipped with a set of standards for every 10 mu of ponds.

II. Pond cleaning

Do a good job of cleaning the pond, drain the water from the pond in winter, and then freeze in the sun for more than 20 days. When the water temperature is 15 days before the fry is put into the pond, 10-20cm deep water is injected and 150kg quicklime per mu is used to clean and disinfect the pond.

Third, seedling release time

Release seedlings before and after the Spring Festival. 300 grass carp fry with size of 15-20cm and weight of 200g-250g can be put in per mu, and 50 silver carp fry and 10 bighead carp fry can be put in at the same time, and the weight of each fry is about 5-6kg. Soak in 5% salt water for 5-10 minutes before release.

IV. Feed feeding

1. It is mainly fed with granular feed with a protein content between 28% and 32%, and some green feed can be fed as an auxiliary feed.

2. Feed should be fed on the principle of "four decisions and four looks" and "coarse and refined before and after". On average, it should be fed twice a day and finished within 2 hours. 80% fullness is the most appropriate.

3. After feeding pellet feed continuously for a period of time, stop feeding for one week, and the raw grain feed can be fed during the stopping period.

4. In order to prevent grass carp from suffering from other diseases such as hepatobiliary syndrome and causing death, appropriate amount of vitamins and other drugs should be added to the feed at ordinary times.

V. Regulation of water quality

1. Manage the water quality well and make rational use of the aerator. On a windless sunny day from June to October, turn on the aerator for about 2 hours from 1 pm to 3 pm every day to increase oxygen in the wee hours of the morning. If it is cloudy for several days in a row, it is necessary to increase oxygen in advance.

2. If we choose the right time to add new water to the pond, we can adopt the method of small amount of drainage and inflow, and changing water many times to regulate the water quality.

In March and June-September, new water should be injected every 3-5 days, about 10cm each time.

4. Every 15-20 days, 10-20 kg of raw lime per mu is used for pulping water, and the pond with a water depth of 1 m is sprinkled once.

VI. Treatment and prevention of fish diseases

The common diseases of grass carp are Gill rot, red skin disease and enteritis, and the usual treatment is the combination of external splashing and internal administration.

1, external splash: mainly take chlorine dioxide, bleach and other disinfectants for cleaning treatment, continuous use for 3 days.

2. Oral administration: feed the bait of Sanhuang Powder, which is made of 50% rhubarb, 30% Phellodendron Phellodendri and 20% Astragalus membranaceus. 0.3 kg of Sanhuang flour and flour paste were mixed well and then mixed into the feed for 50 kg of fish for 3-5 days. The combination of coarse before concentrate, concentrate and green fodder can also control the occurrence of hepatobiliary syndrome in grass carp.

VII. Fishing listing

Fishing is usually carried out at the end of July, and it is most suitable to start fishing when the water temperature is low in the morning. Timely starting to catch large-size adult fish on the market is an effective measure to increase the output value, which aims to reduce the density in the pond and accelerate the growth rate of small grass carp.