The one I posted had just barely gotten the dot. When they're under a certain size it's not very noticable or may not even be there.
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MultispeciesTamer, Are you trying to argue just because, or because you actually want to learn something?
Yes, the fish in the picture has a dot on the dorsal fin, which can be characteristic of a green sunfish, however you can't use that alone (or the blue on the face) to make a definitive I.D.
You said:
I just posted a picture of a green sunfish that has vertical stripes with no blue. Green sunfish often have solid vertical stripes, especially the males (IME).
Your book said:
The green sunfish can also have a black blotch (in fact that's what you're fixated on now), but you're book says no other fish has this. Like the others said, get a new book.
Get away from identifying fish strictly based on pattern and color. You've probably been misidentifying fish for a long time and had no clue, and if you won't take anyone's advice you'll continue to do so.