Don't get me wrong, I prefer the fresh water stuff- less teeth and nothing that stings. I just associate reefs with salt water (from my whopping 11 salt water dives). I keep asking myself why no one makes one of those little pciture slates- "Fishes of the Great Lakes" I think that I've seen 3 different species so far- gobi (non-native?), schooling alewives (non-native?), and that lazy fish with the funky tail.