15. Differences in Growth in the Spiny Dogfish over a Latitudinal Gradient in the Northeast Pacific
Nicole M. Vega, Vincent F. Gallucci, Lorenz Hauser, and James Franks
Abstract.—Growth patterns of the spiny dogfish Squalus acanthias over the latitudinal gradient from Washington State/British Columbia to Baja California/northern Mexico are analyzed. The von Bertalanffy growth model and the versatile growth model of Schnute and Fournier (1980) are used to describe region-specific growth. Statistical comparisons are made using the versatile growth model to determine patterns of growth along the latitudinal gradient. We propose the existence of two open-water demographic subunits in the dogfish population of the Northeast Pacific, northern and southern, which appear to be distinct from the populations in north and south Puget Sound.