I agree with what sprrkplug said. OTOH, I have trapped 1 1/2" GSF that were full of eggs. Did I see them making nests? No. But they WERE ready to spawn even at that small size. That particular pond didn't have predators in it, so that could have been a contributing factor in them getting ready to spawn at such a small size too.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).