Koi have 3 single fine and two sets of paired fine. The caudal or tail fin is primarily used for forward swimming, especially fast swimming. The dorsal (top) fin is used for stabilization during forward motion. The largest leading ray becomes very stiff, sharp, and thorn-like as the Koi grows older. The anal fin, like the dorsal, is used for stabilization. Also, the largest leading ray becomes very stiff, sharp, and thron-like as the koi grows older. the pectoral fins are paired and are used for numerous functions including steering during forward motion, slow swimming both forword and backward, breaking and counteracting the jet effect of the water being forced out of the opercular pectoral Fin openings. The pelvic (or ventral) fins are also paired and serve to control pitch and roll and to counter lift.
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