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



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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