Okay, I had the same question about these coming out of my own pond. I did some research and this is how this works. The fish with yellow tinges on their fins and a larger mouth, but a spot like a bluegill are a hybrid. They look like this:
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They’re a hybrid from a male bluegill:
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And a female green sunfish:
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You can pinpoint the green sunfish because of the little green/blue stripes under its eyes and between its mouth and gill plate.
They’re very aggressive, but they also reproduce at a rate that’s 90% male. This means that they can reproduce between themselves but not at a large rate.
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Thanks! I’ve always wondered about the difference.
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