Every now and again a fish will, for no apparent reason, virtually waste away; turn out to be hollow bellied, listless, and lie around on

Parasitic organisms known as Gyrodactylus and Dactylogyrtts are the trigger of flukes, which are extremely contagious. They lodge in the gills and under the skin

The swim bladder is the organ of depth control, and acts similarly to the ballast tanks of a submarine, but instead of being filled with

Shimmies is much more a sympton than a illness, it is the outward sign that all isn’t as it should be. The fish generally stops

Fungus is the white slimy coating that fish develop following an attack of Ichthyophthirius, which has not been cured. It may also develop indepen-dently, but

This illness could be recognized by a yellow-brown film which starts near the dorsal fin, and, if left unchecked, it’ll spread all over the body