Fishing efficiency changes in the western rock lobster fishery, Panulirus cygnus George, 1962, have been assessed to improve the reliability of the commercial catch rate–based breeding stock indices and effective effort that contribute to a length-based stock assessment
model. The present study covers the fishery under transferable effort quotas from the 1980s to 2009, and under catch quota management from 2010. To evaluate the changes in effective effort and lobster abundance through these events, fishing efficiency has been determined using standardized
abundance indices from six independent survey locations in offshore breeding stock areas. Catch rates from these independent surveys (instituted 1994) have been compared with industry catch rates on adjacent grounds to estimate effort efficiency increases in the breeding stock areas. The catch
rate calibration revealed that the deep water breeding stock areas had efficiency increases of 2.7%–3.6% per annum under effort control, while the shallower water breeding stocks in the offshore Abrolhos Islands were less affected. The change to catch quota management resulted in a marked
decrease in effort efficiency of around 30%; however, the short time series since this management change does not provide a reliable trend of efficiency changes. Factors influencing fishing efficiency, including the management system itself, are considered and the need for validation of catch-rate
based management performance indicators is discussed. Our study highlights the benefits of using fishery-independent surveys to evaluate effort efficiency changes and in addressing the biases normally associated with abundance measures based on commercial catch rates.
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Document Type: Research Article
Western Australian Fisheries and Marine Research Laboratories, P.O. Box 20 North Beach, WA 6920 Australia;, Email: [email protected]
Western Australian Fisheries and Marine Research Laboratories, P.O. Box 20 North Beach, WA 6920 Australia
Publication date: 01 July 2018
This article was made available online on 23 April 2018 as a Fast Track article with title: "Changes in fishing effort efficiency under effort and quota management systems applied to the Western Australian rock lobster fishery".
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The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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