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MEPS 413:125-136 (2010)  -  DOI: https://doi.org/10.3354/meps08719

Growth variability in the splitnose rockfish Sebastes diploproa of the northeast Pacific Ocean: pattern revisited

Vladlena V. Gertseva1,*, Jason M. Cope2, Sean E. Matson3

1Fishery Resource Analysis and Monitoring Division, Northwest Fisheries Science Center, NOAA Fisheries, 2032 South East OSU Drive, Newport, Oregon 97365, USA
2Fishery Resource Analysis and Monitoring Division, Northwest Fisheries Science Center, NOAA Fisheries, 2725 Montlake Boulevard East, Seattle, Washington 98112, USA
3Sustainable Fisheries Division, Northwest Regional Office, NOAA Fisheries, 7600 Sandpoint Way NE, Seattle, Washington 98115, USA

ABSTRACT: Understanding patterns of somatic growth within populations greatly contributes to fisheries stock assessment. Splitnose rockfish Sebastes diploproa was reported as having a striking pattern of latitudinal growth variability from studies conducted in the 1980s. We investigated variation in growth parameters of splitnose rockfish by latitude using recent data from the NOAA Fisheries Groundfish Survey (2003–2008), current ageing techniques, and advanced modeling and statistical methods to provide an updated understanding of growth along this species’ latitudinal range. Sex-specific age data were fit to a von Bertalanffy growth function incorporating ageing error, and growth parameters were estimated for 5 areas along the U.S. west coast, specified based on biogeographic boundaries. Resampled values of each growth parameter were then fit to linear models, and Akaike’s information criterion (AIC) was used to evaluate hypotheses for growth parameter relationship with latitude. We found that splitnose rockfish exhibited a cline in asymptotic length (L), with L increasing with rising latitude. We also found that although the growth coefficient (k) was smallest in the most southern area, there was no apparent cline along the coast; a northward cline in k has previously been reported in the literature. We propose that differences in fishing intensity could be responsible for the cline in L, as higher fishing pressure in the south could skew the size distribution of the population in that region and reduce southern L estimates. We also attribute slower growth in the southern area to oceanographic characteristics and low productivity of the area south of Point Conception.


KEY WORDS: Splitnose rockfish · Northeast Pacific Ocean · von Bertalanffy growth parameter · Latitudinal variability


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Cite this article as: Gertseva VV, Cope JM, Matson SE (2010) Growth variability in the splitnose rockfish Sebastes diploproa of the northeast Pacific Ocean: pattern revisited. Mar Ecol Prog Ser 413:125-136. https://doi.org/10.3354/meps08719

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