Describe some of the major parasitic diseases found in fishes.

Freshwater aquaculture often faces challenges from parasitic diseases, which can significantly impact fish health, growth, and survival. These diseases are caused by various parasites, including protozoans, helminths, and crustaceans, which infect fish under stress or in poor environmental conditions. Some of the major parasitic diseases in freshwater fishes include:

1. Ichthyophthiriasis (Ich or White Spot Disease)

Caused by the protozoan Ichthyophthirius multifiliis, this is one of the most common and economically significant diseases in freshwater aquaculture. The parasite attaches to ___ ____ _______ ______ ____ ______ ___ ____ ___ _____ ________ ____.
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