A fish that is prone to more parasites is haddock.

J. R. Gorham has written:

'Minks' -- subject(s): Minks, Diseases, Parasites

'Minks: diseases and parasites' -- subject(s): American mink, Diseases, Parasites

Copper Sulfate has many different uses, on common one is the treatment of diseases and parasites in aquaculture and ornamental fish.

• predators (sharks, crocodiles, raccoons, large fish, crabs etc.)
• storms
• pollution
• heat (sun)
• parasites/diseases

candida produces parasites