When the species is in question they do take samples for testing.
There are some giant RES in Iowa you just don't hear of many people catching them - I have them in my pond too, never caught one in the nearly two years since stocking. I know there are some big ones in Belvadere
Mat Peirce
1.25 acre southeast Iowa pond
LMB, BG, YP, WE, HSB, RES, BCP
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