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The Plenary Report summarises biological, fishery, stock assessment and stock status information for 80 species or species groups, each of which is split into 1-10 stocks. The Plenary takes into account the most recent data and analyses available to Fisheries Assessment Working Groups (FAWGs) and the Fisheries Assessment Plenary and also incorporates relevant analyses undertaken in previous years.

This page enables you to search through all plenary reports since 2006.


Year:
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38 items
Document detail
Title: Plenary (COCintro_FINAL 08)
COCintro_FINAL 08.pdf (115.9 kb)
Plenary (COCintro_FINAL 08)
Title: Plenary (COC3A_FINAL 08)
COC3A_FINAL 08.pdf (172.7 kb)

 

The last stock assessment for Papanui Inlet and Waitati was in 2007. In Waitati Inlet for 2007 the

biomass of juvenile cockles (>2

 

-18 mm) has increased from 2002 and 2004 levels but remains well-34 mm) cockles has also increased over 2002 and

below figures for 1992. The biomass of adult (19

2004 levels but is lower than that recorded in 1998. The biomass of large adult (L35 mm) cockles is

the lowest since 1992, and the biomass of cockles L30 mm is the lowest since 1998.

No size limit has been set for COC 3. However, commercial fishers currently target cockles between

28-34 mm, and >38 mm. In Waitati Inlet, the estimates of CAY for this size category are above

current catch levels and recent reported landings. Furthermore, CAY estimates for the area of the inlet

where commercial fishing currently occurs are also above current catch levels and recent reported

landings. Catch levels higher than recent reported landings would be required to move the stocks in

the inlets towards a size that will support the maximum sustainable yield.

Cockles recruit to the spawning stocks in the Otago area at a length of about 18 mm shell length. The

harvested beds may receive spat from other areas. For these reasons, and because of the low

harvesting levels, the risk of recruitment overfishing is probably low.

Title: Plenary (COC3A_07)
COC3A_07.pdf (188.7 kb)
Plenary (COC3A_07)
Title: Plenary (COC1A_FINAL 08)
COC1A_FINAL 08.pdf (198.1 kb)

 

Cockles recruit to the spawning stock on Snake Bank at a size of approximately 18 mm shell length.

The Snake Bank cockle population may also receive spat from other beds in the harbour. Therefore, at

the current harvest size (about 30 mm shell length) there is probably a low risk of recruitment

overfishing the Snake Bank population, even at high levels of fishing pressure. The risk of recruitment

overfishing, however, increases as the average size of cockles harvested decreases.

The recruited biomass of cockles (> 30 mm shell length) on Snake Bank declined from over 2000 t in

the early 1980s to about 700 t in the early 1990s. It has since fluctuated between about 500 and 1500 t

without apparent trend, falling to particularly low levels (< 500 t) in 2001 and 2002. There has been a

large increase (78%) in recruited biomass on Snake Bank since the last survey in 2006, but the 2007

length frequency distribution suggests that the recruitment of juveniles (under 20 mm SL) has been

poor compared with recent years, and this could lead to reduced levels of adult recruitment to the

fishery over the next year or two. Before October 2002 (when COC 1A was introduced to the QMS),

the sum of the daily catch limits (584 t), and average landings between 1989

 

–90 and 2001–02 (457 t)

both greatly exceeded estimates of MAY (max

Title: Plenary (COC1A_07)
COC1A_07.pdf (163.9 kb)
Plenary (COC1A_07)
Title: Plenary (COC_intro_07)
COC_intro_07.pdf (28.3 kb)
Plenary (COC_intro_07)
Title: Plenary (COC_7A-7B_FINAL 08)
COC_7A-7B_FINAL 08.pdf (243.9 kb)

Estimates of reference biomass and reference fishing mortality rates are available, and there are estimates of current biomass for each area.
 

At Pakawau Beach, the biomass of cockles does not appear to have declined since the start of the commercial fishery in 1983, and has probably increased owing to exceptional recruitment in 2000. At Ferry Point, the size and abundance of cockles has declined markedly since 1996. A CAY strategy and more frequent surveys may allow this stock to rebuild or at least indicate a long-term average biomass for the area. At Riwaka-Tapu Bay, size and abundance has also declined. A MCY strategy is possible for this stock without on-going surveys, or a CAY strategy with more frequent surveys, which would give better information on the long-term average biomass for the area.
 

Because of the uncertainty over the relationship between BCURRENT and BMSY, it is not known if recent catches and current catch limits will allow the COC 7A stock to move towards a size that will support the MSY.

Title: Plenary (COC_7A-7B_07)
COC_7A-7B_07.pdf (88.8 kb)
Plenary (COC_7A-7B_07)
Title: Plenary (COC_06)
COC_06.pdf (183.6 kb)
Plenary (COC_06)
Title: Fisheries Assessment Plenary May 2017: Stock Assessments and Stock Status
14_COCintro_2017.pdf (518.9 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. COC

Title: Fisheries Assessment Plenary May 2017: Stock Assessments and Stock Status
15_COC1A_2017.pdf (688.9 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. COC1A

Title: Fisheries Assessment Plenary May 2017: Stock Assessments and Stock Status
16_COC3_2017.pdf (365.7 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. COC3

Title: Fisheries Assessment Plenary May 2017: Stock Assessments and Stock Status
17_COC 7A_2017.pdf (711.4 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. COC7A

Title: Fisheries Assessment Plenary May 2016: Stock Assessments and Stock Status
14_COCintro_2016_FINAL.pdf (475.2 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. COC intro
Title: Fisheries Assessment Plenary May 2016: Stock Assessments and Stock Status
15_COC1A_2016_FINAL.pdf (681.9 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. COC 1A
Title: Fisheries Assessment Plenary May 2016: Stock Assessments and Stock Status
16_COC3_2016_FINAL.pdf (742.0 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. COC 3
Title: Fisheries Assessment Plenary May 2016: Stock Assessments and Stock Status
17_COC 7A_2016_FINAL.pdf (685.8 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. COC 7A
Title: Fisheries Assessment Plenary May 2015: Stock Assessments and Stock Status
14_COCintro_2015_FINAL.pdf (443.5 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. COC intro. 
Title: Fisheries Assessment Plenary May 2015: Stock Assessments and Stock Status
15_COC1A_2015_Final.pdf (678.3 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. COC 1A

Title: Fisheries Assessment Plenary May 2015: Stock Assessments and Stock Status
16_COC3_2015_Final.pdf (732.8 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. COC
Title: Fisheries Assessment Plenary May 2015: Stock Assessments and Stock Status
17_COC 7A_2015_Final.pdf (675.5 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. COC
Title: Fisheries Assessment Plenary May 2014: Volume 1 Stock Assessments and Stock Status
Fisheries Assessment Plenary May 2014 Volume 1.pdf (24.2 MB)
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.
Title: 13_COCintro_09
13_COCintro_09.pdf (122.1 kb)
Commercial picking of cockles, Austrovenus stutchburyi, is carried out on Snake Bank, Whangarei Harbour (FMA 1), Pakawau Beach, Ferry Point and Tapu Bay in Tasman and Golden Bays (FMA 7), and Papanui and Waitati Inlets, Otago (FMA 3). Cockles were introduced into the QMS on 1 October 2002.
Title: 14_COC1A_09
14_COC1A_09.pdf (172.6 kb)
Cockles recruit to the spawning stock on Snake Bank at a size of approximately 18 mm shell length. The Snake Bank cockle population may also receive spat from other beds in the harbour. Therefore, at the current harvest size (about 30 mm shell length) there is probably a low risk of recruitment overfishing the Snake Bank population, even at high levels of fishing pressure. The risk of recruitment overfishing, however, increases as the average size of cockles harvested decreases.

The recruited biomass of cockles (>30 mm shell length) on Snake Bank declined from over 2000 t in the early 1980s to about 700 t in the early 1990s. It has since fluctuated between about 500 and 1500 t without apparent trend, falling to particularly low levels (<500 t) in 2001 and 2002. Recruited biomass in 2009 was considerably lower than that estimated from the last two surveys in 2007 and 2008 (the highest levels since 1999), but similar to that in 2006. The 2009 length frequency distribution suggests there has been a slight increase in the recruitment of juveniles (under 20 mm SL) compared with recent years (2007 and 2008), and this could lead to relatively moderate levels of adult recruitment to the fishery in the near future. Before October 2002 (when COC 1A was introduced to the QMS), the sum of the daily catch limits (584 t), and average landings between 1989–90 and 2001–02 (457 t) both greatly exceeded estimates of MAY (maximum average yield based on the
Title: 15_COC3A_09
15_COC3A_09.pdf (161.5 kb)
The last stock assessment for Papanui Inlet and Waitati was in 2007. In Waitati Inlet for 2007 the biomass of juvenile cockles (>2−18 mm) has increased from 2002 and 2004 levels but remains well below figures for 1992. The biomass of adult (19−34 mm) cockles has also increased over 2002 and 2004 levels but is lower than that recorded in 1998. The biomass of large adult (≥35 mm) cockles is the lowest since 1992, and the biomass of cockles ≥30 mm is the lowest since 1998.

No size limit has been set for COC 3. However, commercial fishers currently target cockles between 28-34 mm, and >38 mm. In Waitati Inlet, the estimates of CAY for this size category are above current catch levels and recent reported landings. Furthermore, CAY estimates for the area of the inlet where commercial fishing currently occurs are also above current catch levels and recent reported landings. Catch levels higher than recent reported landings would be required to move the stocks in the inlets towards a size that will support the maximum sustainable yield.

Cockles recruit to the spawning stocks in the Otago area at a length of about 18 mm shell length. The harvested beds may receive spat from other areas. For these reasons, and because of the low harvesting levels, the risk of recruitment overfishing is probably low.
Title: 16_COC_7A-7B_09
16_COC_7A-7B_09.pdf (186.2 kb)
Estimates of reference biomass and reference fishing mortality rates are available, and there are estimates of current biomass for each area.

At Pakawau Beach, the biomass of cockles does not appear to have declined since the start of the commercial fishery in 1983, and has probably increased owing to exceptional recruitment in 2000. At Ferry Point, the size and abundance of cockles has declined markedly since 1996. A CAY strategy and more frequent surveys may allow this stock to rebuild or at least indicate a long-term average biomass for the area. At Riwaka-Tapu Bay, size and abundance has also declined. A MCY strategy is possible for this stock without on-going surveys, or a CAY strategy with more frequent surveys, which would give better information on the long-term average biomass for the area.

Because of the uncertainty over the relationship between BCURRENT and BMSY, it is not known if recent catches and current catch limits will allow the COC 7A stock to move towards a size that will support the MSY.
Title: Fisheries Assessment Plenary May 2013: Stock Assessments and Yield Estimates
014_COCintro_2013.pdf (169.6 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. Cockles Introductory Section.
Title: Fisheries Assessment Plenary May 2013: Stock Assessments and Yield Estimates
015_COC1A_2013.pdf (304.0 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. Cockles (COC 1A).
Title: Fisheries Assessment Plenary May 2013: Stock Assessments and Yield Estimates
016_COC3_2013.pdf (285.5 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.Cockles (COC 3)
Title: Fisheries Assessment Plenary May 2013: Stock Assessments and Yield Estimates
017_COC7A_2013.pdf (235.0 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.Cockles (7A)
Title: Fisheries Assessment Plenary May 2014: Stock Assessments and Stock Status. Cockles 1A (COC)
15_COC1A_2014 FINAL.pdf (313.5 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. Cockles 1A (COC)
Title: Fisheries Assessment Plenary May 2014: Stock Assessments and Stock Status. Cockles 3 (COC)
16_COC3_2014 FINAL.pdf (315.0 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. Cockles 3 (COC)
Title: Fisheries Assessment Plenary May 2014: Stock Assessments and Stock Status. Cockles 7a (COC)
17_COC7A_2014 FINAL.pdf (255.3 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. Cockles 7a (COC)
Title: Fisheries Assessment Plenary May 2014: Stock Assessments and Stock Status. Cockles introduction (COC)
14_COCintro_2014 FINAL.pdf (192.9 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. Cockles introduction (COC)

Title: Cockles - Introduction
13_COCintro_2010.pdf (276.6 kb)
This document summarises the most recent New Zealand fishery and biological information about cockles.
Title: Cockles - Snake Bank (Whangarei Harbour) (COC 1A)
14_COC1A_2010.pdf (122.6 kb)
This document summarises the most recent New Zealand fishery, biological, stock assessment and stock status information about Snake Bank (Whangarei Harbour) cockles.
Title: Cockles - Otago Peninsula (COC 3A)
15_COC3A_2010.pdf (113.0 kb)
This document summarises the most recent New Zealand fishery, biological, stock assessment and stock status information about Otago Peninsula cockles.
Title: Cockles - Nelson/Marlborough (COC7A/7B)
16_COC7A7B_2010.pdf (90.3 kb)
This document summarises the most recent New Zealand fishery, biological, stock assessment and stock status information about Nelson/Marlborough cockles.