07-22-2012, 09:06 AM
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Turbercules are "breeding bumps" for lack of better word. This image of a central stoneroller points out the breeding turbercules. It's very common for members of the family cyprinidae to get them around breeding time. It's when goldfish are easiest to sex.
The caudal peduncle is the muscle that connects the tail fin to the body.
Yay fish anatomy!