Regional differences in otolith morphology of the deep slope red snapper Etelis carbunculus

Smith, M. K. 1992. Regional differences in otolith morphology of the deep slope red snapper Etelis carbunculus. Sagittal otoliths from four populations of the Pacific deep slope red snapper Etelis carbunculus Cuvier were compared using Fourier descriptors and other shape indices, linear proportions, and dry weight. Otoliths from Hawaii, Vanuatu, Fi j i and French Polynesia and a small number from the Commonwealth of the Northern Mar-ianas Islands (NMI) were examined. Regional shape and weight characteristics were distinguishable, despite the wide range of individual variation and limited available size range from some regions. Size-specific differences in otolith shape were found for the four regions for which a sufficient sample was available. Otoliths from Hawaii, French Polynesia, and NMI showed a significant shape affinity. Otoliths from Fij i and Vanuatu were similarly shaped and were distinct from those from the other three regions. Interregional otolith shape affinities for the stocks examined parallel similarities in maximum size and growth rate from the literature, suggesting that growth rate may influence otolith shape. Observed trends in otolith weight as a function of fish length support growth-related regional differences in otolith shape. Des otolithes saginaux de quatre populations de vivanneaux du Pacifique (&te/is carbunculus Cuvier) ont ete compares a I'aide de descripteurs de Fourier et dautres indices de taille, des proportions lineaires et du poids sec. Des otolithes provenant d'Hawai;, du Vanuatu, des Fidji et de la Polynesie franqaise et un petit nombre d