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The broadfin thornyhead (Sebastolobus macrochir) has large pectoral fins, which inspired its Greek name macrochir, meaning "long hand". Broadfins are identified with having a red body and gill cavity, black patches on their dorsal fins, and an anal fin that may have black marks. In addition to having deeper bodies (height: back-to-belly), their pectoral fins are not notched as deeply as those of the shortspine thornyhead. Other distinguishing features are their scale-covered branchiostegals and lower pectoral rays that are more highly branched than the shortspine's. The broadfin thornyhead can grow up to 15.2 in. (38 cm). The broadfin's range extends from the Adak Island region of the
Aleutian Islands southwest to the Sea of Okhotsk and south to Japan.
They are usually found at depths of 1,320 ft. to 1,980 ft. (400-600 m),
and have been found as deep as 4,686 ft. (1,420 m). Broadfins prefer
living in cold water temperatures of 35.6° F to 39.2° F
(2-4° C), in addition to low-oxygen water. This species is solitary
in nature and do not migrate long distances. Among the broadfin's prey
are crabs, shrimps, krill, octopi, squids, and brittle stars.
AFSC Rockfish Guide (refered to as broadbanded thornyhead)
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