That one pond that had a cormorant problem had fish that looked like that. The gash sometimes was only on one side of the fish, other fish had it on both sides. But, only one gash on one side, not 2 gashes side by side like it escaped from a pikes jaw, or 2 gashes on each side of the fish.

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[Linked Image from lh6.ggpht.com]
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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).