Water quality regulation and stocking density are the key points for mandarin fish culture.

During the period of mandarin fish culture, attention should be paid to water quality control and stocking density, and filter-feeding fish can be cultured to maintain the energy cycle of the pond. Fish fry are easy to cause damage in the process of transportation, so self-cultivation of fry can ensure the survival rate. It is necessary to make rational use of medications to reduce the use of irritant drugs and to prevent mandarin fish from being infected by diseases due to the decline of resistance.

1. Reasonable cultivation

Mandarin fish feed on live bait, and in the case of ensuring the normal culture density of mandarin fish, it is easy to raise a certain number of bait fish in the pond, and the feces and residual bait are also relatively large, so in the process of production, a certain number of silver carp and silver carp can be properly cultured as filter-feeding fish to maintain the normal material and energy cycle in the pond and provide a good water quality environment for mandarin fish to grow healthily.

2. Pay attention to the control of water quality

Mandarin fish like to live in lakes and reservoirs with clean water quality. Mandarin fish feed on live bait. After highly cultured, mandarin fish have more metabolic production areas and bait fish, less planktonic biomass, low primary productivity and poor material and energy circulation. Can not be timely converted into residual bait and feces into nutrients used by algae, so that metabolites continue to accumulate and breed a large number of pathogenic microorganisms Endangering the growth and health of mandarin fish.

Therefore, in the process of culture, the aquaculture water should maintain the exuberant algae and keep the water color light green. Keeping the water environment stable can reduce the incidence of the virus. At the same time, attention should be paid to reducing the quality of fertilizers such as urea and ammonium bicarbonate.

3. Reasonable stocking density

At present, mandarin fish culture methods in Jiangsu, Zhejiang and Guangdong are mostly cultured in ponds alone, and some farmers often adopt high-density culture in order to improve economic benefits. the increase of the density of bait fish, the increase of pond load, the increase of metabolites, the accumulation of ammonia nitrogen and other harmful substances, resulting in the deterioration of pond water quality environment and endangering the health of mandarin fish. Generally speaking, the stocking density of mandarin fish about 3cm is 1.5-20.25 million pieces / hm2. Excessive stocking density will increase the probability of mandarin fish virus disease.

4. Seedling cultivation

Most of the mandarin fish fry on the market come from Guangdong area. It is found that mandarin fish fry above 2.5cm on the market are easy to suffer from ciliates, oblique tube worms, rotifers and other diseases in the breeding process. Guangdong area also uses more irritant drugs such as formalin for prevention and control, increasing the probability of mandarin fish suffering from virus diseases.

It is suggested that farmers can choose and purchase 1.8-2.5cm mandarin fish fry for cultivation, which can not only reduce the cost, but also ensure the survival rate in the transportation process. More importantly, the seedling stage can carry out more scientific prevention and control of rotifer, oblique tube worm, ring worm and other diseases.

5. Palatable bait

After the feeding peak of mandarin fish, salvaging healthy mandarin fish showed that two or three bait fish could be found in the stomach of mandarin fish, indicating that the specifications of the matching bait fish were appropriate. All the fish without hard thorns, such as mud carp and silver carp, are the first choice for mandarin bait fish with low price, slender body, wide source, high population yield and high density culture.

6. Taboos on medication

Long-term drug abuse in culture ponds will lead to white liver symptoms of mandarin fish. Mandarin fish are very sensitive to large logarithm of drugs, especially heavy metal salts, halogen chemical disinfectants, organophosphorus pesticides and so on.

Farmers are easily misled by the prevention and control methods in the book, and excitant drugs such as bleach, copper sulfate and strong chlorine are used too frequently in the process of disease prevention and treatment. although these drugs can kill insects and bacteria, but because of their strong corrosiveness, it is easy to destroy the mucus protective layer on the body surface of mandarin fish, and cause inflammation of the Gill tissue of mandarin fish, affecting the normal respiration of mandarin fish, thus causing fish deformities.

And the use of strong irritant drugs has a strong frontal killing effect on mayfly organisms in the water, resulting in adverse effects on the eating of mandarin fish, resulting in the decline of resistance of mandarin fish to infection, resulting in bacterial Gill rot of mandarin fish.