Results 141 to 150 of about 713 (173)

The Age-Structured Production Model for the south coast rock lobster population

2005
The south coast rock lobster resource is modelled using an age-structured-productionmodel (ASPM).
Johnston, Susan J, Butterworth, Doug S
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Allowing for time-varying selectivity in South Coast rock lobster assessments

2007
The Reference Case (RC) age-structured production model that has been used for past South Coast rock lobster assessments (ASWS/JUL07/SCRL/ASS/1) has assumed a time-invariant age-specific selectivity function. Previous work allowing the possibility of deviations from this assumption has used a model identical to the RC model, except that the age ...
Butterworth, Doug S, Johnston, Susan J
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Initial OMP results for the South Coast rock lobster resource OMP

2008
Some initial results following the development of an OMP framework for the management of South Coast rock lobster are presented here, corresponding to a constant catch scenario and runs of a CPUE-tuned-based feedback control rule. First though, the assumptions made for the OMP testing are listed below.
Johnston, Susan J, Butterworth, Doug S
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Final set of OMP results for the South Coast rock lobster resource OMP

2008
Results are presented here for a range of OMP tunings which assume/attain either i) inter-annual TAC constraint of 5%, 7.5% or 10% ii) median recovery levels sp B (2025/2006) of either 1.10, 1.175 or 1.25. The five OMP candidates presented are: OMP1 10% inter-annual TAC constraint + median 1.10 sp B (2025/2006) OMP2 10% inter-annual TAC constraint ...
Johnston, Susan J, Butterworth, Doug S
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Future projections for the south coast rock lobster resource using Bayesian methodology

2005
A Bayesian approach is used to assess the south coast rock lobster resource based upon a model that allows for time-varying selectivity. Estimation precision appears good. Biomass projections and their uncertainties are compared for four different scenarios: two constant catch options, and simple empirically and model-based OMPs.
Johnston, Susan J, Butterworth, Doug S
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Alternative calculation of catches per Area in the South Coast rock lobster fishery

2008
A method to separate the South Coast rock lobster annual catches by Area for the areadisaggregated assessments was described in WG/04/08/SCRL08. Concern was raised about an assumption made with respect to the calculation of those catches, namely that the spatial distribution for HBF was the same as for other companies over the period in which HBF under-
Glazer, Jean Patricia, Butterworth, Doug S   +1 more
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2012 South coast rock lobster operating models-some initial results

2012
Initial updated assessments are developed for the South Coast rock lobster resource incorporating the recently revised estimates of somatic growth rate by area developed by OLRAC, and fitting to area-specific CPUE and scientific catch-at-length data. The initial focus is on a model structure which splits the resource into areas A1E, A1W and A2+3.
Johnston, Susan J, Butterworth, Doug S
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Final 2010 operating models for south coast rock lobster assessment update

2010
This document reports assessment results for the five final 2010 operating models (OMs) used to update the South Coast rock lobster resource assessments. These OMs contain the following modifications from the versions reported in Fisheries/2010/JUL/SWGSCRL/08: • Somatic growth parameters estimated during fitting procedure to be used for all length-at ...
Johnston, Susan J, Butterworth, Doug S
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South coast rock lobster TAC for the 2018/19 season

2018
The application of OMP-2014 results in a TAC of 321 MT for the 20181 season (a 5% decrease in TAC compared to that of 2017).
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Results for the final OMP 2008 selected for the South Coast rock lobster resource

2008
In Johnston and Butterworth (2008) results for a range of OMPs for the South Coast rock lobster fishery were reported. These OMPs varied with respect to the maximum extent of inter-annual TAC variability allowed (5%, 7.5% or 10%) as well as the median spawning biomass recovery anticipated over the next 20 years ( sp B (2025/2006) - ranges from 1.10 to ...
Johnston, Susan J, Butterworth, Doug S
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