Hi Bruce. When I was working on gizzard shad in KS, the two "modes" of late summer gizzard shad came from a rolling spawn. The first spawned fish sort of got a "jump," and it continued through the year. What started as a continuous length group of June and July shad often pulled apart into two length groups by August or September. So, it's at least possible for a rolling spawn to create what appears to be two distinct groups of fish.

Whether this applies to bluegills, who knows. I'll know more after another year or two of larval trawling. :-)

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From Bob Lusk: Dr. Dave Willis passed away January 13, 2014. He continues to be a key part of our Pond Boss family...and always will be.