Biological characteristics and mortality of western butterfish (Pentapodus vitta), an abundant bycatch species of prawn trawling and recreational fishing in a large subtropical embayment

Mant, Jason C. and Moran , Michael J. and Newman, Stephen J. and Hesp, S. Alex and Hall, Norman G. and Potter, Ian C. (2006) Biological characteristics and mortality of western butterfish (Pentapodus vitta), an abundant bycatch species of prawn trawling and recreational fishing in a large subtropical embayment. Fishery Bulletin, 104(4), pp. 512-520.

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Abstract

The western butterfish (Pentapodus vitta) is numerous in the bycatch of prawn trawling and recreational fishing in Shark Bay, Western Australia. We have thus determined crucial aspects of its biological characteristics and the potential impact of fishing on its abundance within this large subtropical marine embayment. Although both sexes attained a maximum age of 8 years, males grow more rapidly and to a larger size. Maturity is attained at the end of the first year of life and spawning occurs between October and January. The use of a Bayesian approach to combine independent estimates for total mortality, Z, and natural mortality, M, yielded slightly higher point estimates for Z than M. This result indicates that P. vitta is lightly impacted by fishing. It is relevant that, potentially, the individuals can spawn twice before recruitment into the fishery and that 73% of recreationally caught individuals are returned live to the water.

Item Type: Article
Title: Biological characteristics and mortality of western butterfish (Pentapodus vitta), an abundant bycatch species of prawn trawling and recreational fishing in a large subtropical embayment
Personal Creator/Author:
CreatorsEmail
Mant, Jason C.
Moran , Michael J.
Newman, Stephen J.
Hesp, S. Alex
Hall, Norman G.
Potter, Ian C.
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 104
Number: 4
Page Range: pp. 512-520
Date: 2006
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Item ID: 8944
Depositing User: Patti M. Marraro
Date Deposited: 27 Jun 2012 16:54
Last Modified: 27 Jun 2012 16:54
URI: http://aquaticcommons.org/id/eprint/8944

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