MN -- black crappies are notorious for being hard to handle and haul. They often have delayed mortality. You are still pre-spawn, and 6-7 inch fish may very well be able to spawn this year. Could you tell if any females had eggs when you stocked them (plump enough to see/feel the eggs)?

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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.