Yes to CC and Tilapia, I don't know on the GC. They work on bullheads too. The mesh has to be sized so the fish don't swim thru it. As to what size, that all depends on the size of the fish that you want to let swim out of the net. wink

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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).