Bacterial disease

Tail rot or fin rot:

• The causative agent is Flexibacter columnaris
• The most contagious bacterial disease of carp and results in the putrefaction of the ail or other fins.

Symptoms:

• A more or less distinct white line is seen at the margin of the fin in the early stages of the disease.
• The line moves towards the base of the fin and the fin becomes torn, and after some time the entire fin is destroyed.
• In a severe 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