Decline in disease resistance of fish obesity prevention and treatment of obesity in tilapia

Tilapia culture

[pathogen]: tilapia was fed with low-protein, high-fat, high-sugar and vitamin-deficient diet for a long time, resulting in disturbance of fat metabolism, large accumulation of fat, obesity and reduced disease resistance.

[symptoms and diagnosis]: in obese tilapia, systemic adipocyte proliferation and adipose infiltration, especially the abdominal adipose tissue and the adipose tissue around the organs increased significantly, and the abdominal adipose tissue of the diseased fish accounted for 3% of the body weight. 5% of the body weight, the liver is yellowish, the liver tissue is highly steatosis, and the liver cells are atrophied. Cut off the whole liver tissue and put it in the water, it will float on the surface, while the normal liver will sink to the bottom immediately.

[epidemic and harm]: factory cultured tilapia with high density. If the diet is not nutritious, the disease is easy to occur. The disease is mainly harmful to mature tilapia. The disease resistance of diseased fish is low, and it is easy to be infected with Escherichia coli, pneumothorax and other diseases. Obesity creates conditions for the infection of conditional pathogens. Bacterial infections secondary to obesity can cause more serious harm to tilapia.

[prevention and treatment]: (1) improve the feed formula to meet the normal growth needs of tilapia as far as possible. Vitamin B, vitamin C and vitamin E are properly added to the diet. Natural feed can also be added. (2) Obesity is mainly harmful to mature tilapia, so it is necessary to catch mature tilapia on the market in time, which can feed the loss and alleviate the disease. (3) strengthen feeding and management, keep the water quality clean and fresh, and take antibiotics regularly.