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Spatial variation in size at onset of maturity of female southern rock lobster Jasus edwardsii around Tasmania, Australia


Gardner, C and Frusher, SD and Barrett, NS and Haddon, M and Buxton, CD, Spatial variation in size at onset of maturity of female southern rock lobster Jasus edwardsii around Tasmania, Australia, Scientia Marina, 70, (3) pp. 423-430. ISSN 0214-8358 (2006) [Refereed Article]


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DOI: doi:10.3989/scimar.2006.70n3423


The size at onset of maturity (SOM) of female Jasus edwardsii (Hutton, 1875) was estimated at 50 sites around Tasmania, Australia, based on the presence of ovigerous setae. There was a distinct spatial cline with the largest SOM being found at northwestern sites and the smallest at southwestern sites. Variation in SOM between sites was substantial and ranged from 59 mm to 112 mm carapace length. The observed decline in SOM from north to south was the reverse of that described for the same species at similar latitudes in New Zealand, which suggests that SOM in J. edwardsii is regulated by factors in addition to temperature. The effect of density on female SOM was investigated by comparing SOM estimates from two marine reserves with adjacent fished sites; however, there was no evidence of a decline in SOM with increasing density as predicted. A model of SOM predicted by latitude and longitude is described to facilitate spatial modelling of lobster stocks. The substantial and predictable spatial variation in SOM implies that management of this fishery would be improved by incorporating spatial elements, such as regional legal minimum size limits.

Item Details

Item Type:Refereed Article
Keywords:Jasus edwardsii; maturity; rock lobster; reproduction; spatial management
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Aquaculture and fisheries stock assessment
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - wild caught
Objective Field:Fisheries - wild caught not elsewhere classified
UTAS Author:Gardner, C (Professor Caleb Gardner)
UTAS Author:Frusher, SD (Professor Stewart Frusher)
UTAS Author:Barrett, NS (Associate Professor Neville Barrett)
UTAS Author:Haddon, M (Associate Professor Malcolm Haddon)
UTAS Author:Buxton, CD (Professor Colin Buxton)
ID Code:40945
Year Published:2006
Web of Science® Times Cited:49
Deposited By:TAFI - Marine Research Laboratory
Deposited On:2006-08-01
Last Modified:2009-11-10
Downloads:890 View Download Statistics

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