Erm is there a list of what they do? I discovered the second one, but I must have missed the message about what it does...

If you go to the Trophy Room and click on each fish, it tells you what it does :-)

There are also various lists of them in the Fish Tycoon Guides section of the forums (near the bottom of the main forum page). Of course, they contain spoilers!

Ooh thanks for the help. This place is so useful, as I get a lot of questions while playing.