Most of us use a book, Peterson's Guide to Freshwater Fishes by Page
and Burr. It's a decent guide to identifying fishes. And, you can take it
with you into the field.
You could also try to obtain the "Fishes of <State>" book for your state.
Sajjad
-- Sajjad Lateef email: sajjad <at> acm.org Chicago, IL web: http://www.lateef.org/sajjad/
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