Carp (goldfish or koi)
The rivers are really lacking in fish variety compared to the oceans. Maybe there could be plain carp in the rivers, which could then be converted into different varieties of goldfish or koi. This could be done by feeding the fish a gold ingot or gold bar (GOLDfish). Maybe you could make golden sea grass instead similar to a golden carrot or apple to feed them if that would make more sense.
They would look really nice if someone wanted to build a pond outside, and it would be neat to have a fish you can interact with other than killing it.
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