Maturity and growth of female dusky rockfish (Sebastes variabilis) in the central Gulf of Alaska

Chilton, Elizabeth A. (2010) Maturity and growth of female dusky rockfish (Sebastes variabilis) in the central Gulf of Alaska. Fishery Bulletin, 108(1), pp. 70-78.

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Abstract

The dusky rockfish (Sebastes variabilis) has recently been resurrected as a distinct species in the genus Sebastes. Reproductive biology and growth were examined for this redescribed species in the central Gulf of Alaska. Age and length at 50% maturity were 9.2 years and 365 mm fork length, respectively, which are lower than previously reported. Fertilized ova and eyed embryos were observed in April and evidence of postparturition was not observed until May. The gonadosomatic index decreased with the onset of postparturition in May. Von Bertalanffy growth parameters for female dusky rockfish, estimated from the maturity samples, were significantly different from growth parameters derived from Gulf of Alaska fishery-independent survey data.

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