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Space-time variation in catchability of southern rock lobster Jasus edwardsii in Tasmania explained by environmental, physiological and density-dependent processes

Citation

Ziegler, PE and Frusher, SD and Johnson, CR, Space-time variation in catchability of southern rock lobster Jasus edwardsii in Tasmania explained by environmental, physiological and density-dependent processes, Fisheries Research, 61, (1-3) pp. 107-123. ISSN 0165-7836 (2003) [Refereed Article]

DOI: doi:10.1016/S0165-7836(02)00240-0

Abstract

A seasonal catchability model for the rock lobster Jasus edwardsii, which had been developed previously for a population in a scientific reserve, was applied to catchability estimates over several years in northern and southern fishing regions off Tasmania, Australia. Catchability was estimated from commercial catch and effort data and fishery-independent estimates of exploitation rates. The seasonal catchability models describe the effects of water temperature, moulting and mating on catchability. They suggest that similar environmental and physiological processes underpin seasonal catchability in the two regions of the fishery, but that the relative importance of these factors varies considerably between the two regions. Physiological processes dominate the pattern of catchability in the north while water temperature contributes significantly to the model only in the south. Interannual variation in relative catchability was correlated with density-dependent processes. Full models described 72% of the total variation in catchability over 6 years in the south and 80% of the total variation over 4 years in the north. © 2002 Elsevier Science B.V. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Marine Flora, Fauna and Biodiversity
Author:Ziegler, PE (Dr Philippe Ziegler)
Author:Frusher, SD (Professor Stewart Frusher)
Author:Johnson, CR (Professor Craig Johnson)
ID Code:26310
Year Published:2003
Web of Science® Times Cited:26
Deposited By:TAFI - Zoology
Deposited On:2003-08-01
Last Modified:2011-10-04
Downloads:0

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