Title: Fisheries Assessment Plenary May 2023 Volume 2 – KAHAWAI (KAH)
36 KAH 2023.pdf
(927.2 kb)
Fisheries Assessment Plenary May 2023 Volume 2 – KAHAWAI (KAH)
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KAH 1
An assessment was undertaken for KAH 1 in 2007. In the assessment for KAH 1 there was uncertainty
in some important model inputs (e.g., recreational catch history and abundance indices) and some
influential biological parameters could not be estimated within the model (e.g., natural mortality and
the spawner recruitment relationship).
The approach taken to represent uncertainty was to determine the four main factors for which
uncertainty was likely to have an impact on key model outputs (referred to as the ‘axes of
uncertainty’) and then to select a limited number of plausible options across each axis. Model runs
were then undertaken for all possible combinations of options across each axis – this set of options
was referred to as the ‘grid’. Overall, the grid comprised 36 model runs which in totality were thought
to be a realistic reflection of the extent of uncertainty in the KAH 1 assessment.
Based on the scenarios examined, it is likely that current spawning biomass is above B
MSY, but it isMSY it is unlikely that the stockMSY at current assumed catch levels, given the model recruitment assumptions.M=0.18 and including all abundance indices were undertaken in
uncertain how far above.
Current assumed removals are lower than
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Plenary (KAH_07)
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Plenary (KAH_06)
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Title: Fisheries Assessment Plenary May 2017: Stock Assessments and Stock Status
36_KAH_2017.pdf
(682.9 kb)
<root> <span style="font-family: Arial, sans-serif; font-size: 9.5pt;">The May 2017 Fisheries Plenary Report summarises fishery, biological, stock assessment and stock status information for 83 of New Zealand’s commercial fish species or species groups in a series of Working Group or Plenary reports. Each species or species group is split into 1-10 stocks for management purposes. KAH</span> <p class="MsoNormal"><o:p></o:p></p> </root>
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Title: Fisheries Assessment Plenary May 2016: Stock Assessments and Stock Status
36_KAH_2016_FINAL.pdf
(1.4 MB)
The May 2016 Fisheries Plenary Report summarises fishery, biological, stock assessment and stock status information for 83 of New Zealand’s commercial fish species or species groups in a series of Working Group or Plenary reports. Each species or species group is split into 1-10 stocks for management purposes
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Title: Fisheries Assessment Plenary May 2015: Stock Assessments and Stock Status
36_KAH_2015_FINAL.pdf
(1.5 MB)
The May 2015 Fisheries Plenary Report summarises fishery, biological, stock assessment and stock status information for 82 of New Zealand’s commercial fish species or species groups in a series of Working Group or Plenary reports. Each species or species group is split into 1-10 stocks for management purposes. KAH
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The May 2014 Fisheries Plenary Report summarises fishery, biological, stock assessment and stock status information for 82 of New Zealand’s commercial fish species or species groups in a series of Working Group or Plenary reports. Each species or species group is split into 1-10 stocks for management purposes. Volume 2 covers the John Dory to Red Gurnard.
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KAH 1
An assessment was undertaken for KAH 1 in 2007. In the assessment for KAH 1 there was uncertainty in some important model inputs (e.g., recreational catch history and abundance indices) and some influential biological parameters could not be estimated within the model (e.g., natural mortality and the spawner recruitment relationship).
The approach taken to represent uncertainty was to determine the four main factors for which uncertainty was likely to have an impact on key model outputs (referred to as the ‘axes of uncertainty’) and then to select a limited number of plausible options across each axis. Model runs were then undertaken for all possible combinations of options across each axis – this set of options was referred to as the ‘grid’. Overall, the grid comprised 36 model runs which in totality were thought to be a realistic reflection of the extent of uncertainty in the KAH 1 assessment.
Based on the scenarios examined, it is Likely that current spawning biomass is above BMSY, but it is uncertain how far above.
Current assumed removals are lower than almost all estimates of deterministic MSY. Combining this with the result that most estimates of current biomass are well above BMSY it is unlikely that the stock will decline below BMSY at current assumed catch levels, given the model recruitment assumptions.
The current TAC for KAH 1 is 3315 t w
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Title: Fisheries Assessment Plenary May 2013: Stock Assessments and Yield Estimates
036_KAH_2013.pdf
(501.3 kb)
The May 2013 Fisheries Plenary Report summarises fishery, biological, stock assessment and stock status information for 82 of New Zealand’s commercial fish species or species groups in a series of Working Group or Plenary reports. Each species or species group is split into 1-10 stocks for management purposes. Kahawai (KAH).
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Title: Fisheries Assessment Plenary May 2014: Stock Assessments and Stock Status. Kahawai (KAH)
36_KAH_2014 FINAL.pdf
(614.4 kb)
The May 2014 Fisheries Plenary Report summarises fishery, biological, stock assessment and stock status information for 82 of New Zealand’s commercial fish species or species groups in a series of Working Group or Plenary reports. Each species or species group is split into 1-10 stocks for management purposes. Kahawai (KAH)
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Title: KAHAWAI (KAH) – Fisheries Assessment Plenary May 2022 Volume 2
36 KAH 2022.pdf
(1.8 MB)
KAHAWAI (KAH) – Fisheries Assessment Plenary May 2022 Volume 2
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Title: Kahawai (KAH) – Fisheries Assessment Plenary May 2024 Volume 2
36 KAH 2024.pdf
(687.7 kb)
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Title: Kahawai (KAH) – May Plenary Report 2021 Volume 2
36 KAH 2021.pdf
(1.1 MB)
Kahawai (KAH) – May Plenary Report 2021 Volume 2
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This document summarises the most recent New Zealand fishery, biological, stock assessment and stock status information about kahawai.
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