Density per mu of four major domestic fish culture

The four major domestic fish refer to grass carp, bighead carp, silver carp and herring, in which grass carp culture density per mu is about 1200, bighead carp culture density is about 50 per mu, silver carp culture density is about 300 per mu, and herring culture density is about 300 per mu.

One and four major domestic fish culture density per mu

Sihong fish in China are very common in natural waters and are suitable for public edible fish. they refer to grass carp, bighead carp, silver carp and herring.

1. Silver carp: swimming mainly in the upper layer of the water area, feeding on phytoplankton such as green algae, and the culture density is about 300 fish per mu.

2. Bighead carp: because of its large head, it is known as fat-headed fish, also known as silver carp, lives in the middle and upper layers of the water, mainly eats zooplankton, and the breeding density is about 50 fish per mu.

3. Grass carp mainly live in the middle and lower layers of the water, which is discharged by the vegetation in the water, and then eaten after the excrement produces microorganisms. When eating, it will filter out the microorganisms inside, and the breeding density is about 1200 per mu.

4. Herring: lives in the lower layer of the water area, mainly eats molluscs such as snails and clams, and the breeding density is about 300 per mu.

2. Water quality management of four major domestic fish culture

1. Change water at the right time

Aquaculture needs to change water for fish ponds for a certain period of time, especially when the water quality is gradually getting worse, the old pond water with a depth of 20-30cm needs to be pumped out and replaced with new water to dilute the organic matter in the water, but do not change into a lot of new water at one time, so as to avoid damage to the water environment and cause stress reaction.

2. Application of zeolite powder

The dosage of zeolite powder is usually 30-50kg/ mu, and the specific amount depends on the actual situation, such as the degree of water pollution. Spraying appropriate amount of zeolite powder can increase oxygen on the one hand, and degrade some organic matter in water on the other hand, so as to reduce water pollution.

3. Apply probiotics

The main results are as follows: (1) the application of probiotics immediately after the application of zeolite powder, which contains a large number of photosynthetic bacteria and HEM, can help the four domestic fish to form a better growth environment, decompose harmful substances, inhibit the reproduction of bacteria, and at the same time have less drug residues and safer food.

(2) the dosage of probiotics is 1-2kg/ mu each time. After application, attention should be paid to avoid using disinfection articles again and reduce the times of drainage and water change, so as to avoid waste.

4. Drug disinfection

Regular disinfection can also improve the water quality and prevent diseases in the pool to a certain extent, but at the same time, disinfectants will also bring certain side effects, such as killing some planktonic organisms, thus disturbing the ecological balance of the whole water environment. Chlorine dioxide, organic iodine and bromine are the main disinfectants used in the market, and the effect is better than bleach powder. Otherwise, it will reduce its resistance.

5. Quicklime

When there are abnormal phenomena such as rainfall, thickening of pool color or low visibility, 15-30kg quicklime can be applied, which can not only adjust the water color, but also maintain the buffer property.

6. Captive culture of filter-feeding fish

Filter-feeding fish such as silver carp and bighead carp are mainly algae in drinking water, which can increase the consumption of ammonia nitrogen and organic debris in water, effectively improve water quality and increase transparency.

7. Mechanical oxygenation

The aerator can increase oxygen, stir water and aerate, promote the oxygen content in water and reduce the feed coefficient by promoting, exchanging and circulating flow, which is helpful to promote the growth and development of the four domestic fish and is widely used in freshwater culture.

In addition, the circulation of water also promotes the distribution and reproduction of plankton, increases productivity and the ability to absorb ammonia nitrogen and nitrite, and improves water quality and environment. The pond with a yield of more than 250kg per mu is equipped with 0.25-1KW/ mu of aerator power, and the effect of installing multiple aerators is better.

8. Drug oxygenation

When the floating head phenomenon occurs in the four major domestic fish, it shows that the water quality has deteriorated, and appropriate amount of hydrogen peroxide, calcium peroxide and high efficiency oxygen enhancers can be used to increase oxygen to the fish in emergency, but can not produce dependence, and the fundamental solution to water quality can not be achieved overnight. The above methods should also be adopted to maintain management step by step.