Goldfish do too have tummies! Big fat ones!
Ounce for ounce, I do not believe goldfish produce more waste than other fish. That just doesn't make sense. They have a lower metabolism than animals in warm water. They aren't any more active. I think that's a myth that runs along the same lines as the inch-per-gallon rule--it ignores the actual mass of the fish. Inch for inch, yeah, goldfish produce more waste--and it's directly proportional to their girth!
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