Quote:
Originally Posted by (E)
If the right species of fish are present their waste is rich in nitrates and can act as a fertilizer for the plants.
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Catfish are a very popular suggestion for this. They taste fine, are vegetarians and can be fed a simple diet of grain and soybeans, and aren't terribly delicate. They need a fairly warm climate though, so that restricts your options.
Carp might be another option; they don't
like an entirely herbivorous diet, but they can eat it.