I know nothing about it really. But I'm still catching crappie wit eggs in 12 ft water 10 today. Biggest 16 1/2 in wish I knew how to post pics cause she was a monster. I think the biggest top to bottom I've ever caught So I don't think gills are done yet at least on north barkley buddy say he caught 50 gills today and 1 red ear I didn't ask about eggs I ask him tomorrow he usuall lets big girls go