Wow I could really play this game forever. These fish look incredible! The music is perfect for the atmosphere. I played for awhile and never got tired of it.
I wanted to see how many fish I could create before the game crashed, and I found it - 370. After this point, the game lagged too much to be able to keep playing. In the future maybe you could limit the actual number of fish on screen to be something like 100-200.
Only complaint was that it didn't go on forever! Very nice job on this.