As you did not indicate on which continent you want to identify fresh water
fish parasites I guessed it is North America. Try this book:
Parasites of North American Freshwater Fishes
Glenn L. Hoffman.
University of California Press 1967 pp486
Old, but very complete.
If this does not answer your question please indicate fish species and
region of origen, for a more specific answer.
Evert Liewes
The Netherlands
Tel: +31-20-4161374
Fax: +31-20-4161378
Mobile: +31-653 750 272
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