There is no built-in breeding tracker in Fish Tycoon, which is why there are so many different charts/programs/web sites out there that people have developed to help them with that task. Many of those are accessible in the Fish Tycoon Guide.

If you're diligent in your initial breeding efforts, you can find fishies that will survive (and even thrive) in a level 1 Fish Environment and sell for well above $50.