Do any of you know of a good book on fresh water fish ID?

There are national field guides (like you find for birds) -Peterson series has a freshwater fish one, called Freshwater Fishes.

But, fish are not like birds, and are a bit more complicated to ID. I'd suggest you look for a regional guide, probably available through a university outreach (Cooperative Extension) or your state fisheries department. They will get you on the right track. Such books are less likely to be found in your local Border's, but are worth asking around in the right places for.

There are certainly many resources on the Internet to help with fish identification.

I own Guide to Freshwater Fishes of New York and Ken Schultz's Field Guide to Freshwater Fish.

Looking around bookstores, fish field guides weren't easy to come by.

http://www.identicards.com/

Check this page - they have all kinds of stuff on the subject.