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745
Oncorhynchus mykiss
Trout, Rainbow Freshwater
Mycosis
Peritoneal tissues
Saprolegnia
Saprolegnia
Specimens are yolk sac fry. Most have absorbed the majority of yolk. Some darkening but not all fish showing colour change. Darkened, moribund fish may have swollen abdomen. Some swimming on their side. Inlet pipes to hatchery were fouled with algae.
H&E
PAS
Growcott Gomori methnamine silver
Common infection
Marked inflammatory response to the fungal hyphae which permeate the wall of the intestine and can be seen in the gut lumen
Farm location
Not recorded
UK
S. W. Feist
9/14/2001
