Abstract
Lateral-body bar marking differences can be used for identifying young-of-year bluegills and pumpkinseeds. The young-of-year of both species were reared in the laboratory from eggs and examined weekly for lateral-body bar pigmentation development. Pumpkinseeds were found to develop spots between the bars when they had reached the size of 25 mm while bluegills never developed spots but had distinct body bars by 24 mm. Examination of older fish of both species from three natural populations confirmed these differences as species typical.
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