Browsing by Subject "South Coast"

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    Further results for the Sex- and Area-specific Age-Structured Production Model for the South Coast rock lobster resource
    (2008) Johnston, Susan J; Butterworth, Doug S
    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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    Re-tuning of OMP-2008 using updated 2010 operating models for the South Coast rock lobster resource to provide OMP-2010
    (2010) Johnston, Susan J; Butterworth, Doug S
    This document provides detailed specifications for population projections under future possible catch series, and details of the OMP. Based on updated operating models OMP-2008 is re-tuned to attain the same median recovery target of a 20% increase in spawning biomass from 2006 to 2025 as agreed two years previously. Results are not greatly changed, with new projections of spawning biomass showing a little greater uncertainty under the resultant OMP-2010 than was the case previously.