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Estimating species-specific catch rates in a mixed-species dive fishery
Citation
Burch, P and Mayfield, S and Stobart, B and Chick, RC and McGarvey, R, Estimating species-specific catch rates in a mixed-species dive fishery, Journal of Shellfish Research, 30, (2) pp. 425-436. ISSN 0730-8000 (2011) [Refereed Article]
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Copyright Statement
Copyright 2011 National Shellfisheries Association
Abstract
Catch-per-unit-effort (CPUE) is frequently used as ameasure of relative abundance in fisheries stock assessment.
Determining reliable estimates of species-specific CPUE is more challenging in multispecies, rather than single-species, fisheries
because identification of appropriate effort data for each species is often difficult. Divers in the South Australian abalone fishery
can harvest blacklip (Haliotis rubra) and greenlip (Haliotis laevigata) abalone simultaneously, but report only a single value for
daily fishing effort. This is problematic because total allowable commercial catches are set for each species following
species-specific stock assessments in which CPUE is a key index of relative abalone abundance. To provide an evidence-based
approach to the identification of the most appropriate CPUE estimation method for ongoing assessment of the fishery, we
assessed six diverse CPUE estimation methods for estimating annual, species-specific CPUEs using 30 y of data. The candidate
CPUE estimation methods yielded relative CPUE time series with similar temporal trends throughout the 30-y period. These
relative CPUE estimates each had low coefficients of variation and were highly correlated with one another, requiring
consideration of other factors to determine a preferred method.Using a catch-weighted estimate of CPUE (CPUEWt) overcomes
many of the problems associated with using the other five methods tested. Specifically, CPUEWt (1) weights each daily catch and
effort objectively; (2) removes the need to ‘‘subset’’ the data subjectively, which ensures that data availability and representation
are not reduced by arbitrary rules; and (3) is relatively simple to explain to stakeholders and can be applied consistently to
greenlip and blacklip abalone at multiple spatial scales across the fishery. Although the requirement to estimate species-specific
catch rates in mixed-species dive fisheries is rare, our analyses demonstrate that CPUEWt could provide a robust measure of
species-specific CPUEs across other diverse multispecies fisheries.
Item Details
Item Type: | Refereed Article |
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Keywords: | CPUE, abalone, fishery assessment, spatial management |
Research Division: | Agricultural, Veterinary and Food Sciences |
Research Group: | Fisheries sciences |
Research Field: | Aquaculture and fisheries stock assessment |
Objective Division: | Animal Production and Animal Primary Products |
Objective Group: | Fisheries - wild caught |
Objective Field: | Wild caught edible molluscs |
UTAS Author: | Burch, P (Dr Paul Burch) |
ID Code: | 92793 |
Year Published: | 2011 |
Web of Science® Times Cited: | 5 |
Deposited By: | Sustainable Marine Research Collaboration |
Deposited On: | 2014-06-27 |
Last Modified: | 2014-08-13 |
Downloads: | 322 View Download Statistics |
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