Grey mullet have been exploited by customary, commercial, and recreational fishers for over 100
years. They are found predominantly in harbours and these environments have undergone
considerable change over this period due to a range of anthropogenic sources. The impact of these
changes on potential carrying capacity and productivity are not understood and this potentially has
impacts on the yields for GMU.
GMU 1 is currently assessed using CPUE data and these analyses suggest that the GMU 1 fishery is
composed of a number of spatially distinct substocks and tagging data suggest low to moderate
mixing between them. CPUE analyses undertaken using data through to 2001-02 led the Inshore
FAWG to conclude in 2005 that catches on the west coast of GMU 1 were unlikely to be sustainable.
Updated CPUE analyses using data up to 2005–06 have found that the CPUE in the Kaipara Harbour,
Manukau Harbour, and east Northland (which collectively account for over 80% of the GMU 1 catch)
have increased since 2002. Therefore catches in these areas appear to be sustainable in the short term.
It is not known if the recent catches will allow the sub-stocks to move toward a size that will support
the MSY.
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Plenary (GMU_07)
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Plenary (GMU_06)
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Title: Fisheries Assessment Plenary May 2017: Stock Assessments and Stock Status
29_GMU_2017.pdf
(468.1 kb)
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. GMU
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Title: Fisheries Assessment Plenary May 2016: Stock Assessments and Stock Status
29_GMU_2016_FINAL.pdf
(463.4 kb)
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. GMU
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Title: Fisheries Assessment Plenary May 2015: Stock Assessments and Stock Status
29_GMU_2015_FINAL.pdf
(457.6 kb)
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. GMU
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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 1 covers the Introductory Sections to Jack Mackerel.
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Grey mullet have been exploited by customary, commercial, and recreational fishers for over 100 years. They are found predominantly in harbours and these environments have undergone considerable change over this period due to a range of anthropogenic sources. The impact of these changes on potential carrying capacity and productivity are not understood and this potentially has impacts on the yields for GMU.
GMU 1 is currently assessed using CPUE data and these analyses suggest that the GMU 1 fishery is composed of a number of spatially distinct substocks and tagging data suggest low to moderate mixing between them. CPUE analyses using data up to 2005–06 have found that the CPUE in the Kaipara Harbour, Manukau Harbour, and east Northland (which collectively account for over 80% of the GMU 1 catch) have increased since 2002. Therefore catches in these areas appear to be sustainable in the short-term. The status of GMU1 relative to BMSY is unknown.
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This document summarises the most recent New Zealand fishery, biological, stock assessment and stock status information about grey mullet.
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