That sux. I am doing some breeding experiments by exploiting this. I put my real game on "stop time". I am just doing to find what combinations make what. I have a great list so far. I don't think I have found every type of fish, or variation. I am still wondering what two fish make a Spotanus.
Check my attatchment. It's a text file of what I have found so far. It just took me a few hours to make everything on that list. I'd say 6 or 7. That's the time I spent, not what the game thinks I spent lol.