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ASFB Home > 2007 > Multi-State Mark-Recapture Analysis Yields Estimates of Fishing Rates: Implications for the Conservation Management of Murray Cod Using Population Modelling.

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Multi-State Mark-Recapture Analysis Yields Estimates of Fishing Rates: Implications for the Conservation Management of Murray Cod Using Population Modelling.

Charles R. Todd1, Simon J. Nicol2, John D. Koehn1, Jason C. Lieschke1 and Jarod P. Lyon1.

1 Arthur Rylah Institute for Environmental Research, Department of Sustainability and Environment, 123 Brown Street, Heidelberg, Victoria, 3084. Email charles.todd@dse.vic.gov.au
2
Oceanic Fisheries, Secretariat of the Pacific Community, Noumea, New Caledonia.

Abstract

A mark-recapture survey has been undertaken continuously between Yarrawonga and Tocumwal on the Murray River for the past 8 years. Anglers have been encouraged to return information on their captures and report on the fate of the individually tagged fish. Tagged fish removed by anglers from the tagged population can be incorporated into the analysis of the mark-recapture dataset using a recently developed analysis for jointly analysing live and dead encounters in a multi-state design. Due to analytic constraints, the data were divided into 150mm size classes, and the analysis of this construct yields fishing rates for the size classes (mm) 450-600 (13.5%); 600-750 (32.2%); 750-900 (35.3%); and 900+ (3%). We examine the implications of these fishing rates on the conservation management of Murray cod by including them in a stochastic population model for Murray cod.

Key Words

Mark-recapture; population modelling; fishing rates.

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