Further results for the Sex- and Area-specific Age-Structured Production Model for the South Coast rock lobster resource

Working Paper

2008

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http://hdl.handle.net/11427/18492
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Johnston_Further_results_for_Sex_2008.pdf (180.71 KB)
Authors
Johnston, Susan J
Butterworth, Doug S
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University of Cape Town

Department
Marine Resource Assessment and Management Group
Faculty
Faculty of Science
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Abstract
This document provides an update on the development of sex- and area-specific operating models for testing candidate OMPs for the South Coast rock lobster resource. Models are needed which can provide reasonable fits to both the CPUE and catch-at-length data available. Generally this has required the introduction of either time-varying selectivity or effort saturation effects. For the former, two approaches have been suggested: “MARAM” and “OLRAC”. This document presents improved results for the MARAM approach through use of a more complex selectivity function for Area 3 (Model 2), and also implements a version of the “OLRAC” approach (Model 3e). Implementations involving effort saturation are underway
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South Coast
rock lobster

Reference:

Johnston, S. J., & Butterworth, D. S. (2008) Further results for the sex-and area-specific Age-Structured Production model for the South Coast rock lobster resource.

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