Male fish have parasites. Male fish, also known as bighead carp, silver carp, chub head fish, Baotou fish, bighead carp, silver carp and silver carp, is a kind of freshwater fish.

Parasitic diseases of male fish: killing insects once every April-May, and killing insects once every July-August in water with a large amount of organic fertilizer, which is more common in large waters.

A. ACIPENSER sinensis disease: Its symptom is that fish eggs or worms are parasitic on the gills of fish, and there are no obvious symptoms when a small number of parasites appear. When a large number of parasites appear, the mucus on the gills of diseased fish increases, the ends of gill filaments swell, swell, edema, pallor, dyspnea and anxiety, and the caudal fin often emerges from the water, commonly known as "tail-lifting syndrome", and finally emaciation and suffocation. Mainly controlled by avermectin or pyrethroid drugs.

B. Anchorage disease: Its symptoms are that large worms can be seen on the surface of the diseased fish, and the parasitic parts are bloodshot and red, fidgety, and the appetite is not strong, and then the fish body is emaciated and dies. Mainly controlled by avermectin or pyrethroid drugs.