This time of year in Ohio, there will likely be male bluegill guarding nests somewhere close by, should you decide to transplant some. Females only visit the nest for a few minutes, so if you see a lone BG standing pat over a depression in the pond bottom, it is probably male.
Course' it might be a male Pumpkinseed, Greenie, Redear (good choice also), Longear, or a hybrid of any the above. Identification is very important.
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