gets it's usual joke answers .....

here's what I've always believed, right or wrong --

if the belly/chest area is red/orange ... it's male
if the belly/chest area is yellow ... it's female

Now, I could be totally off base on that .... but, all the egg laden Bluegill, that I've ever seen, had yellow belly areas. Mind you, that ain't been alot of them, but I seriously don't recall ever seeing a Bluegill with a red or orange colored belly area ... that was full of eggs.

If my facts are incorrect, then I stand corrected. And ... the answer to the queston would then be ... "you probably can't"

... cp

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