Age and growth of the black scabbardfish Aphanopus carbo (Trichiuridae) off the Canary Islands

Abstract

The age and growth of the black scabbardfish Aphanopus carbo off the Canary Islands were determined. A total of 368 individuals caught at depths of 800-2300 m between 2004 and 2006 were analysed. Males ranged in size between 1035 and 1335 mm TL, and females between 995 and 1475 mm TL. A significant difference in the mean size was found between sexes. Age was determined using whole otoliths, which showed clear growth rings. Two rings, one opaque and one translucent, were laid down each year on the otoliths. Age estimates ranged between 2 and 8 years old for males, and between 2 and 12 years old for females. Von Bertalaffy growth parameters for both sexes were estimated, and significant differences in growth parameters were observed between sexes.