At first, I tried limiting the number of fish, but it introduced so many crashing bugs that I gave up on it. There were many instances where the program expected a certain portion of memory to be allocated for fish objects, but in the non-registered version it wouldn't be because of limiting the number of fish.
I guarantee that we will get email from people who still don't feel like they are getting enough in the free version. "I have to type in "testfish" every time I want to change the settings? Outrageous!"