Journal article

Estimation of instantaneous rates of tag shedding for school shark, Galeorhinus galeus, and gummy shark, Mustelus antarcticus, by conditional likelihood

YS Xiao, LP Brown, TI Walker

FISHERY BULLETIN | NATL MARINE FISHERIES SERVICE SCIENTIFIC PUBL OFFICE | Published : 1999

Abstract

Fish and other animals are often tagged to estimate their abundance as well as rates of growth, fishing mortality, natural mortality, and movement. Results of these studies are biased if tags are not retained permanently and if tag loss is not taken into account. In this paper, we develop a simple tag shedding model to account for the effects of time at liberty, sex, and other factors and use one of its special cases to estimate the instantaneous tag shedding rate from data based on two double-tagging experiments on the school shark, Galeorhinus galeus, and gummy shark, Mustelus antarcticus, off southern Australia. For either species, tag shedding rate could vary with tag type, position of t..

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University of Melbourne Researchers