Since both of those catfish are roughly the same length, take a look at the difference in mouth gape (size). That's why Flatheads are worse in a pond for eating fish than CC. Lusk has found 3# LMB in a Flathead stomach in a pond.......

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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).