Based on one picture without the length and weight or BoW location knowledge. I would be trying to catch more fish for comparison and suspect stunting for sure with a possible bonus deformity at the 2/3 mark on the body to tail.
If you catch multiple fish that seem to be pretty lean, I would switch gears and fish or trap the sunfish specifically to confirm. May be missing year classes of the food source needed to maintain the weight of the fish.
1.5acre LMB, YP, BG, RES, GSH, Seasonal Tilapia
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