OpenUCT Home
→
Browsing by Author

Browsing by Author "Johnston, Susan"

Now showing items 1-20 of 64

Next Page

2018 GLMM-standardised Tristan lobster CPUE compared with the current OMP target levels (Itar)

Author: Johnston, Susan ; Butterworth, Doug S Date: May 2018 This document reports the 2018 GLMM-standardised Tristan lobster CPUE compared with the current OMP target levels that are in place for each island. Read more
The 2018 south coast rock lobster reference case operating model

Author: Johnston, Susan ; Butterworth, Doug S Date: 2019 This document details the current 2018 Reference Case Operating Model which is to be proposed to be used for simulation testing of a new OMP for South Coast rock lobster. Read more
2018 Updated horse mackerel assessments

Author: Johnston, Susan ; Butterworth, Doug S Date: Oct 2018 The assessments for the two hypotheses (reduced catchability and a one-off additional mortality event) for the recent reduced Desert Diamond catch rate are updated to take one further year’s data into account. The 2017 CPUE somewhat increased ... Read more
2018 updated south coast rock lobster assessment results

Author: Johnston, Susan ; Butterworth, Doug S Date: 2018 The 2017 assessment of the resource is updated given two further years of catch-at-length data now available. Recruitment is estimated to have increased over the last two seasons compared to the previous three seasons when recruitment was ... Read more
2018 updated south coast rock lobster assessment results

Author: Johnston, Susan ; Butterworth, Doug S Date: 2019 The 2017 assessment of the resource for South Coast rock lobster is updated given the two further years of catch-at-length data and one further year of CPUE data now available. Recruitment is estimated to have decreased over the last two ... Read more
2018 updated west coast rock lobster assessments

Author: Johnston, Susan ; Butterworth, Doug S Date: Nov 2018 A new set of 2018 assessments for all five super-areas for the west coast rock lobster resource has recently been completed. These provide the bases for projecting the resource forwards (in each super-area) under alternative future catches ... Read more
Addendum to: Further 2018 west coast rock lobster assessment and associated biomass projections results

Author: Johnston, Susan ; Butterworth, Doug S Date: Aug 2018 This Addendum provides further results for the two-step TAC phase down option, where the distribution of the TAC amongst the Super-areas is changed. The shifts from A8+ are to either or both of A34 and A7. The Results are shown in the Tables ... Read more
Adjustments made to recent catches and CPUE for West Coast Rock Lobster in Areas 3+4 and 5+6

Author: Butterworth, Doug S ; Glazer, Jean ; Johnston, Susan ; van Zyl, Daniel Date: Aug 2018 During the 2017/18 fishing season, some catches made in Area 3+4 by trapboats were landed in Area 5+6 as hoopnet catches. This document reports the methodology used and the results obtained from an attempt to correct the catches reported for ... Read more
Age-Structured Production Model (ASPM) assessments of the Alfonsino (Beryx splendens) resource in the SIOFA area of the Southern Indian Ocean

Author: Brandão, Anabela ; Butterworth, Doug ; Johnston, Susan Date: 2020 An Age-Structured Production Model is applied to assess the Alfonsino (Beryx splendens) resource in the West and East SIOFA areas of the Southern Indian Ocean. Data limitations restrict these applications to deterministic variants, which ... Read more
Application of a minor variant of OMP-2014 to the updated base case operating model for the SCRL resource

Author: Johnston, Susan ; Butterworth, Doug S Date: 2019 Projected TAC outputs for OMP-2014 at that time are compared to those that subsequently eventuated. A minor variant of OMP-2014 is applied to the adjusted base case SCRL operating model for a number of values for the central parameter CPUE_targ. Read more
Biomass Survey results for Nightingale which include the recent February 2016 Leg 2 survey results

Author: Johnston, Susan Date: Apr 2016 At the end of 2015, following indications in the recent biomass survey CAL data, provided by the September 2015 survey, that there may be a reduction in the 50-65mm size classes, concern was raised that this could be a “post-OLIVA” effect ... Read more
Comparison between methods of estimating future recruitment for west coast rock lobster projections for super-area A8+

Author: Johnston, Susan ; Butterworth, Doug S Date: 2019 Initial applications of alternative approaches to forward projection of the rock lobster abundance in super-area A8+, based on suggestions made at the 2018 international workshop (IWS), are presented. Read more
Comparison between methods of estimating historical and future recruitment for the west coast rock lobster super-areas

Author: Johnston, Susan ; Butterworth, Doug S Date: 2019 This document introduces a new approach for estimating historical recruitment, and consequently projecting future recruitment, for west coast rock lobster, which takes account of the recommendations of International Panel at the 2018 stock ... Read more
The consequences of different inshore/offshore splits of the WCRL TAC

Author: Johnston, Susan ; Butterworth, Doug S Date: Nov 2018 Coarse estimates are provided of relative inshore (<30m depth) and offshore (30m+ depth) biomasses for each of the five super-areas using two methods – one being based on rough estimates provided by van Zyl of the hoop/trap catchability ratio, ... Read more
CTRM Program Redevelopment: Interim Summary Report

Author: Furman, Liam ; Johnston, Susan Date: 2010 Read more
The final OMP (2017) recommended for Nightingale.

Author: Johnston, Susan ; Butterworth, Doug S Date: Jan 2018 This document provides the final specifications of the OMP recommended for Nightingale island. Read more
Final updated 2019 assessments and projections of west coast rock lobster for different poaching scenarios

Author: Johnston, Susan ; Butterworth, Doug S Date: 2019 The 2018 assessments and projections for the five super-areas for the west coast rock lobster resource are updated to 2019, using basically the same approach as in 2018. The update takes account of a further year’s catch and resource monitoring ... Read more
Further 2018 west coast rock lobster assessment and associated biomass projections results

Author: Johnston, Susan ; Butterworth, Doug S Date: Aug 2018 This document provides results requested at the WCRL SWG meeting on Friday 24 August. First negative log-likelihoods are provided for the base case and two sensitivity poaching scenario assessment model fits. Then results are provided for a ... Read more
Further CMP results for the SCRL resource

Author: Johnston, Susan ; Butterworth, Doug S Date: 2019 Results are reported for three further CMPs for the south coast rock lobster. Simulations now take the 2017 catches and CPUE values into account. Read more
Hake Data: problems, solutions and GLM CPUE sensitivity to alternate scenarios

Author: Fairweather, Tracey ; Glazer, Jean ; Leslie, Rob ; de Decker, Michelle ; Johnston, Susan ; Butterworth, Doug S Date: 2009 The checks carried out on the hake offshore trawl catch and effort data, which provide the basis to split the catches by species and to obtain GLM-standardised CPUE indices of abundance by species, have focused on two separate steps. The first ... Read more

Now showing items 1-20 of 64

Next Page

Browse

All of OpenUCT