In this disease, red colored part will be hanging out from the anal region. In the initial stages of this disease, red coloured hanging part will be taken back inside and again will protrude out again. In the extreme stages of this disease, red colored part will not go inside.
This disease is due to internal bacterial or parasitic infection inside gut. It is curable if treatment is initiated in the initial stages. Fish Dr. Paracure, Fish Dr. Stress Reducer and ENPR with CNN are the combinations to be used for this disease.
You tube link of fish suffering from Hernia is also provided here.