To me, it looks like there is some RES in the gene pool somewhere by the red dot on the ear tab on a few fish.

Many of them are stunted - look at the large eye.

I take it this pond is more than a year old? Do you know what fish were in there before you stocked it last year?

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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).