Causes and control methods of anorexia in grass carp

Grass carp is one of the main species of freshwater fish culture in China, but there will be anorexia in the culture of grass carp. The eating situation of grass carp is related to the economic benefits of farmers, which is a serious problem. So what is the cause of grass carp anorexia? How to solve this problem? Let's take a look.

1. Anorexia symptoms

At the beginning of feeding, the grass carp's food intake is relatively normal, but after a period of time, it will be found that its food intake obviously decreases, sometimes even suddenly does not eat, the fish concentrate on the surface of the water swimming, some holding feed, forage swimming, but rarely feeding.

2. Causes of anorexia

There are many reasons for grass carp anorexia, such as sudden changes in weather, large temperature difference between day and night in early spring, resulting in frequent convection up and down the water layer, and a large difference in water temperature between the upper and lower layers, causing anorexia. In early spring is also the outbreak period of parasites, a large number of parasites parasitized in the grass carp body, leading to its anorexia. There is also a deterioration of the feeding environment, poor water quality and bottom quality, more toxic substances in the water, more oxygen content, affecting the normal feeding of grass carp. There is also the problem of pesticides or feed. When killing parasites, pesticides will be spilled, which may cause grass carp poisoning, thus affecting the food intake. In addition, the phenomenon of deterioration and corruption of feed will also affect the food intake.

3. Preventive measures

For the water quality and substrate to deal with, in the culture before using quicklime or bleaching powder after thorough pond cleaning, in the use of sunlight exposure to the bottom of the pool, so as to reduce the harmful substances in the substrate, for the management of water quality to pay attention to, frequently change water. Before and after the early spring to Qingming is available times net insects, avermectin to eliminate parasites, generally eat twice a week, the effect is better, pay attention to concentration, so as not to lead to grass carp poisoning. Feed and forage must be fresh, and uneaten feed should be taken out in time to avoid pollution to water quality.

4. Treatment

Anorexia caused by parasites can be eliminated with insect bacteria and copper sulfate, and detoxified with cool water antidote the next day, which can improve water quality. For anorexia caused by poor substrate quality and water quality, the whole pool can be sprinkled with bottom poison to decompose organic waste, and then detoxify with stress detoxification the next day.

The above is an introduction to the causes and prevention methods of grass carp anorexia. I hope it can help you. If you want to know more about it, please pay attention to us.