Abstract
The cigar shark, Isistius brasiliensis, recorded at first by Quoy and Gaimard (1824) in the Atlantic, has been shown to be cosmopolitan in the tropical and subtropical belts, but records in the Pacific are rather scarce taken in the waters near the Hawaiian Is., Christmas I., Galapagos Is., and off Peru, etc.The specimen (166.0 mm, female), identified here as I. brasiliensis, was colleced alive from the stomach content of a Scomberomorus sp.in June 1959 by M/S No.18 Ise Maru at 16°S, 97°W.The cigar shark is believed swallowed by this predator in the surface water.Comparing the measurements of the present specimen with those given by King and Ikehara (189.0 mm, female), there were found some differnce in proportional length of body parts to the total length, especially in preventral length.However, such morphological differences whether due to individual or local variation within the large Pacific population of the species may not be predicted at this moment.
