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: 301-318. doi:10.1006/jfbi.2001.1826


Author Platten, J. R.
Tibbetts, I. R.
Sheaves, M. J.
Title The influence of increased line-fishing mortality on the sex ratio and age of sex reversal of the venus tusk fish
Journal name Journal of Fish Biology   Check publisher's open access policy
ISSN 0022-1112
Publication date 2002-01-01
Sub-type Article (original research)
DOI 10.1006/jfbi.2001.1826
Volume 60
Issue 2
Start page 301
End page 318
Total pages 18
Editor Professor Margalith Galun
Place of publication London, England
Publisher Elsevier Science
Language eng
Subject C1
300704 Ecosystem Studies and Stock Assessment
770302 Living resources (incl. impacts of fishing on non-target species)
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. (C) 2002 The Fisheries Society of the British Isles.
Keyword Fisheries
Marine & Freshwater Biology
Choerodon
Labridae
Fishing
Sex Reversal
Coral-reef Fish
Black-spot Tuskfish
Social-control
Choerodon-schoenleinii
Sperm Economy
Growth
Hermaphroditism
Reproduction
Pisces
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Ecology Centre Publications
Centre for Marine Studies Publications
 
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Created: Wed, 15 Aug 2007, 04:37:25 EST