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Catchability of the southern rock lobster Jasus edwardsii. II. Effects of size

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Ziegler, PE and Johnson, CR and Frusher, SD and Gardner, C (2002) Catchability of the southern rock lobster Jasus edwardsii. II. Effects of size. Marine and Freshwater Research, 53 (8). pp. 1149-1159. ISSN 1323-1650

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Abstract

For most of the year, the size-frequency distribution of trap-caught southern rock lobster, Jasus edwardsii, reflected size-specific catchability rather than the size-frequency distribution of the population in a scientific reserve in Tasmania, Australia. The size-frequency distributions of the population on the ground and of lobsters captured in traps were similar only during a few months, typically during moulting and mating. Small males and females were usually under-represented in traps. Catchability generally increased with size, but varied with sex and season. During moulting and mating, size-specific catchability and relative selectivity of larger animals were similar to or lower than for smaller animals. The relative pattern of catchability throughout the year was similar for most size classes within each sex. Negative associations between small and large lobsters in traps were stronger in winter than in summer, indicating strong behavioural interactions. These interactions could explain the lower catchability of smaller lobsters. Relative selectivity estimates using tag-recapture and size-specific catchability data provided generally similar results.

Item Type: Article
Keywords: Invertebrata ; Arthropoda ; Crustacea ; Decapoda ; Macrura ; Marine environment ; Pacific Ocean ; South Pacific ; Oceania ; Australia ; Jasus edwardsii ; Tasman Sea ; Tasmania ; Coastal zone ; Stock ; Population structure ; Size effect ; Body size ; Sex ; Intraspecific comparison ; Seasonal variation ; Fishing ; Capture rate ;
Journal or Publication Title: Marine and Freshwater Research
Page Range: pp. 1149-1159
ISSN: 1323-1650
Identification Number - DOI: 10.1071/MF01244
Additional Information: http://www.publish.csiro.au/nid/127/issue/544.htm
Date Deposited: 21 Jun 2007
Last Modified: 18 Nov 2014 03:18
URI: http://eprints.utas.edu.au/id/eprint/1204
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