Causal organism - Gyrodactylus
Clinical signs - Epidermic layer will turn gray and damage due to extraction of mucus, spines will be short and decay. Lesions will occur.
Preventive and Control measures –Soaking in 2-3 percent salt solution for 2-5 minutes for 3-4 days; or soaking in 100-200 ppm Formalin + 10 ppm Acriflavin for about 1 hour for 3 days; or soaking in formalin 45 ppm.