The influence of increased line-fishing mortality on the sex ratio and age of sex reversal of the venus tusk fish

Platten, J. R., Tibbetts, I. R., and Sheaves, M. J. (2002) The influence of increased line-fishing mortality on the sex ratio and age of sex reversal of the venus tusk fish. Journal of Fish Biology, 60 (2). pp. 301-318.

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Abstract

The age of sex reversal of the venus tusk fish Choerodon venustus, caught by line fishing at various locations on the southern Great Barrier Reef, indicated that C. venustus is capable of modifying its life cycle in response to increased mortality. The evidence suggests Masthead Reef fish, which experience the highest mortality, underwent sex reversal at a smaller size and younger age than at the other sites. The largest female fish, sexually transitional fish and males were smaller at Masthead Reef than at the Swains Reefs or One Tree Reef at Masthead Reef. There was also considerable overlap in the size of males and females within the exploited populations indicating that sex reversal is not initiated at a particular length but may have a social cause. The sex ratio of fish was essentially the same for fish fully susceptible to line fishing in the Swains and Masthead samples. Circumstantial evidence suggested that the absence of large males in a population may initiate sex reversal, indicating the maintenance of a constant sex ratio may have a social basis.

Item ID: 8486
Item Type: Article (Refereed Research - C1)
Keywords: Choerodon; labridae; fishing; sex reversal
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ISSN: 1095-8649
Date Deposited: 30 Mar 2010 05:51
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 100%
SEO Codes: 96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960502 Ecosystem Assessment and Management of Antarctic and Sub-Antarctic Environments @ 100%
Citation Count from Web of Science Web of Science 20
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