The opercular tab, as noted above, is usually - but not always - significantly bigger on males. Males tend to be much darker in color when mature, whereas females tend to be yellow-green; mature males have a boxier body shape like both of the fish you're holding, whereas females are usually more elongated.
A surefire way to tell when they're spawning is to squeeze the fish in the midsection - if it's a male, he'll milt you.
Comment by Mike Penrose on April 14, 2010 at 5:23am
What are some tell tale signs to distinguish between male and female. I want to be sure I know the difference when I harvest some for breed stock.
Extremely short hair, beard.
OH!!! You meant the bluegills! Bright, beautiful gills and breast colors, enlongated black flap on gill. Plus, they both just look like they work out and have muscles. Boy gills are just prettier than girl gills.
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