Climatic change drives dynamic source–sink relationships in marine species with high dispersal potential [PDF]
Ecology and Evolution, 2021 While there is now strong evidence that many factors can shape dispersal, the mechanisms influencing connectivity patterns are species‐specific and remain largely unknown for many species with a high dispersal potential.
Catarina N S Silva +2 more
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OMP 2023 candidates for the Jasus tristani rock lobster fishery at Nightingale island [PDF]
, 2023 Current assessments of the rock lobster Jasus tristani estimate current spawning biomass at Nightingale to be 99% of pristine – an exceptionally healthy level. The performances of three OMP candidates for the fishery for rock lobster at Nightingale are reported, which vary in the maximum future TAC ceiling (either the current 95 MT or a higher 100 MT ...
Holloway, Susan, Butterworth, Doug
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GLM-standardised rock lobster (Jasus tristani) vessel CPUE at Tristan [PDF]
, 2022 A GLM method is described which is used to standardise the vessel CPUE data at Tristan. The vessel CPUE provides a more optimistic indication of stock status than the powerboat CPUE for the 2017 seasons.
Butterworth, Doug, Johnston, SJ
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Recommendations on rock lobster TACs for Tristan rock lobster Jasus tristani, Nightingale, Inaccessible and Gough islands for the 2022/23 season [PDF]
, 2022 OMPs are the agreed basis to recommend rock lobster (Jasus tristani) TACs for all four islands of the Tristan da Cunha Group. The application of these OMPs using the most recent CPUE and survey data (and Vessel CPUE data in the case of Tristan) for input into the various OMPs are used to calculate the TACs for the 2022/23 season.
Holloway, Susan, Butterworth, Doug
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Nightingale island rock lobster (Jasus tristani) assessment updated for 2023 [PDF]
, 2023 This paper provides an updated assessment of the rock lobster resource at Nightingale island. This assessment includes updated data from both the commercial fishery and the biomass surveys. The continued recent (2013+) high GLM standardised CPUE values (and biomass survey index values) at the island, which were not anticipated earlier, suggest that the
Holloway, Susan, Butterworth, Doug
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Tristan Group Biomass Survey results of Jasus tristani including data from the 2022 season. [PDF]
, 2023 This paper reports the updated biomass indices (to include the 20221 season) obtained from the annual biomass survey at each island. The Tristan biomass has shown a steady increase since 2015. Survey results at Inaccessible and Gough have been steady over recent years, with a slight decline in 2022 at Inaccessible and a slight increase at Gough.
Susan Holloway (9998819)
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Updated von Bertalanffy growth functions following recent tagging data of Jasus tristani lobster [PDF]
, 2022 This document details the process that was applied to determine the current growth parameter values which were used in the most recent assessments for all four islands of the Tristan da Cunha group. Detailed analyses of more recently collected growth increment data obtained from tagging are reported.
Holloway, Susan, Butterworth, Doug
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The development of a new OMP 2023 for Tristan da Cunha island rock lobster (Jasus tristani) resource [PDF]
, 2023 Results for three candidate OMPs to be considered in the development of a new OMP (OMP-2023) for the Tristan rock lobster resource are reported. All three CMPs show that the lower 5th percentile of spawning biomass in 2033 relative to pristine are well above 0.5.
Holloway, Susan, Butterworth, Doug
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Summary of recommendations on Jasus tristani rock lobster TACs for the Tristan group of islands for the 2022/23 season [PDF]
, 2022 This brief document summarises the scientific recommendation of rock lobster TACs for the four Tristan group of islands for the 2022 (i.e. 2022/23) season.
Butterworth, Doug, Johnston, SJ
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Updated 2021 GLMM-standardised lobster CPUE from Inaccessible, Nightingale and Gough islands from the Jasus tristani fishery [PDF]
, 2022 The longline CPUE series for Inaccessible, Nightingale and Gough islands are GLMM standardised through to 2021. Year, month, area, trap-type, soak time, depth, sequential day and year-area interactions are treated as fixed effects, and year-month interactions treated as a random effect.
Butterworth, Doug, Johnston, SJ
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