To help with recruitment, add a truckload or two of pea gravel to some areas that are 2'-3' deep and relatively flat. Have some cover nearby with smaller openings in it for the YOY fish to escape predation from the larger fish.

You will turn the tide if you keep at it, but it will take a few years.

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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).