(Cop-Mar 6426 p. lx Take l-ll-8gx 767) The Pacific Salmon Investigation of the U. S. Fish and Wildlife Service have X-rayed approximately 40,000 sockeye salmon that were collected from the high seas, major river systems and fisheries from the Columbia River to north of the Arctic Circle. In 1959, a sockeye or red salmon, that had no dorsal fin was collected in the Kvichak River in the Bristol Bay area, Alaska. This is the only example of a dorsal fin anomaly of this type noted in the Seattle Biological Laboratory. The dorsal fin area revealed no scar, no radical bones and the scale rows appeared normal. It was reasonably established that the fin anomaly was due to non-development of the dorsal fin. Salmonids with abnormal fins are not unusual. (Maxfield, 1958, Copeia (3) 232-3; and French, 1960, Copeia (3): 247-8).