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Something I've wondered is what sort of distribution can you maintain in a Tilapia population. In some fish populations once you get to a certain size those fish can cannibalize the fry such that you get no additional fish regardless of breeding until they are removed. Any thoughts on that?

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That doesn't happen in nature because the small fish can fit into hiding spots the large ones can't. That's why people who own ponds toss in things like pallets and felled trees. That'd be easy to replicate.

Fry are typically separated from the larger fish with netting. Sure, you could keep them all together, but a huge amount of system resources will be consumed by the endless cycle of breeding and cannibalizing and you will won't get fish to a useful size.

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