It's a male BG that has the body color/characteristics of a female. That way it can sneak into a nest with another male BG and also fertilize the eggs when a female is in the nest. The male BG that "owns" the nest won't chase the cuckolder out.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).