Bacterial disease

Tail rot or fin rot:

• Causative agent is Flexibacter columnaris
• Most contagious bacterial disease of carps and results in the putrefaction of tail or other fins.

Symptoms:

• More or less distinct white line is seen at the margin of fin in early stages of the disease.
• Line moves towards the base of the fin and the fin becomes torn, and after sometime the entire fin is completely destroyed.
• In sever stage, the infection may spread on the body and invade the connective tissue too.

Control measures

• Oxytetracycline or Terramycin orally @ 7.5 g (active) per 100 kg feed per day for 2 weeks.
• Dip treatment for one minute in 500 ppm CuSO₄