Conference Proceedings

The phenomenon of apparent change of growth rate in gummy shark (Mustelus antarcticus) harvested off southern Australia

TI Walker, BL Taylor, RJ Hudson, JP Cottier

FISHERIES RESEARCH | ELSEVIER | Published : 1998

Abstract

The hypothesis of the 'Phenomenon of Apparent Change in Growth Rate' caused by length-selective fishing mortality is adopted for explaining observed differences in published von Bertalanffy growth curves for gummy shark (Mustelus antarcticus) determined from length-at-age data. Three independent pieces of evidence are presented in support of this hypothesis to explain the differences in the curves between 1973-76 and 1986-87 in Bass Strait and between Bass Strait and South Australia during 1986-87: (1) Mean length of the sharks in each of the ages-classes 3-7 years are shown to be different between the two periods and the two regions, but not different for the 2-year age-class which is affec..

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