[Pathogen] is a punctate subspecies of Aeromonas punctata, belonging to Gram-negative bacteria.

【 Symptoms 】 Ill fish are usually inflamed near the anus or at the tail stalk (rarely at the front of the body), and erythema appears on the skin and muscles, sometimes like pustules. With the development of the disease, the scales in this part fall off, and the muscles gradually rot, forming a round or oval focus, full of blood, and the edge is red, which seems to have a red mark, so it is called India disease. Sick fish are thin and swim slowly; When the illness is serious, death may occur one after another. When the water quality is unclean or the fish is damaged, it is often infected with this disease. There is no obvious popular season.

[Treatment] Fish diseases caused by Gram-negative bacilli can refer to other treatment methods.