There is a book that is out of print called "Trout Biology". I had a copy and loaned it to someone years ago. I would love to have it back. Of course, I can't remember who I loaned it to. If anyone posting on this thread could find a used one you would enjoy it. Obviously we are all interested in this discussion. I don't write a lot of long posts on the board but this one is very interesting to me, especially since part of my job is to write the morning report. If any of you can find some of these books let me know. I want one. I think it would answer many of our questions. And, like Snaildarter said, this is a fun discussion. I can't wait to see where it goes.