Title: Fisheries Assessment Plenary May 2023 Volume 3 – SCAMPI (SCI)
78 SCI 2023.pdf
(3.6 MB)
Fisheries Assessment Plenary May 2023 Volume 3 – SCAMPI (SCI)
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Plenary (SCA1_07)
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Plenary (SCA CS_FINAL 08)
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Plenary (SCA CS_07)
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Plenary (SCA CS Coromandel_06)
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Plenary (SCA 1_FINAL 08)
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Plenary (SCA 1 Northland_06)
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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 November 2014: Stock Assessments and Stock Status
14-SCA1_2014 FINAL.pdf
(339.0 kb)
The November 2014 Fisheries Plenary Report summarises fishery, biological, stock assessment and stock status information for 17 of New Zealand’s commercial fish species or species groups in a series of Working Group or Plenary reports. Scallops (SCA1)
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Title: Fisheries Assessment Plenary November 2014: Stock Assessments and Stock Status
15-SCA7_2014 FINAL.pdf
(692.1 kb)
The November 2014 Fisheries Plenary Report summarises fishery, biological, stock assessment and stock status information for 17 of New Zealand’s commercial fish species or species groups in a series of Working Group or Plenary reports. Scallops (SCA7)
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Title: Fisheries Assessment Plenary November 2014: Stock Assessments and Stock Status
16-SCACS_2014 FINAL.pdf
(479.7 kb)
The November 2014 Fisheries Plenary Report summarises fishery, biological, stock assessment and stock status information for 17 of New Zealand’s commercial fish species or species groups in a series of Working Group or Plenary reports. Scallops (SCA CS)
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The November 2014 Fisheries Plenary Report summarises fishery, biological, stock assessment and stock status information for 17 of New Zealand’s commercial fish species or species groups in a series of Working Group or Plenary reports. Volume 2 covers Rock Lobster to Yellowfin Tuna.
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The November 2013 Fisheries Plenary Report summarises fishery, biological, stock assessment and stock status information for 19 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. Scallops (SCA 1).
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The November 2013 Fisheries Plenary Report summarises fishery, biological, stock assessment and stock status information for 19 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. Scallops (SCA 7).
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The November 2013 Fisheries Plenary Report summarises fishery, biological, stock assessment and stock status information for 19 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. Scallops (SCA CS).
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The mid-year November 2012 Fisheries Plenary Report summarises fishery, biological, stock assessment and stock status information for 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. The November Plenary includes Working Group and Plenary summaries for species that operate on different management cycles to those summarised in the May Plenary Report. It includes Highly Migratory Species (HMS), rock lobster, scallops and dredge oysters, covering 17 species in total.
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Estimates of current biomass for the Northland fishery are available (from a 2007 survey) but there are no estimates of reference biomass with which to compare them. A substantial increase in biomass was observed between 2003 and 2006, which resulted in the 2006 biomass estimate being the highest recorded for Northland. In 2005 and 2006, estimates of biomass were considerably higher than those in 2003 for some beds (notably Bream Bay), but similar or lower in others. There appeared to have been a “shift” in biomass away from the Far North and towards Bream Bay and Mangawhai/Pakiri Beach. This was the “reverse” of the shift towards the Far North that occurred in the early 1990s. However, the 2007 survey results suggest the biomass in Bream Bay and Mangawhai/Pakiri has declined markedly since 2006, and, consequently, the overall fishery biomass is far lower in 2007 than in recent years.
Substantial uncertainty stemming from assumptions about dredge efficiency during the surveys, rates of growth and natural mortality between survey and season, and predicting the average recovery of meatweight from greenweight remain in these stock assessments. Future research should be aimed at reducing this uncertainty, and could include a modelling study of dredge efficiency using existing data, and more field studies of scallop growth and mortality. Managing the fisheries based on the number of recruited scallops at the start of the season as oppos
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An estimate of current biomass is available for the SCA 7 fishery. Estimates of B0 and BMSY are not available, and are probably not appropriate reference points for a stock with highly variable recruitment and growth such as scallops.
There has been a substantial decline in the biomass of scallops in both Golden Bay and Tasman Bay since about 2002; current biomass is extremely low in Tasman Bay. In contrast, biomass in the Marlborough Sounds has remained relatively stable over the same period. The cause of the biomass decline in Golden Bay and Tasman Bay is unknown, but it is thought to be associated with factors other than simply the direct removals of scallops by fishing. Indirect effects of fishing and/or environmental factors could have influenced scallop abundance.
Recent SCA 7 landings have been low, and Tasman Bay has been completely closed to commercial harvesting since 2006. Catch has been consistently below the TACC, which is set at a relatively high level under section 14 of the Fisheries Act 1996 because of the rotationally enhanced management strategy. The intended strategy was to open sectors on a three yearly rotational basis, with reseeding at the end of the season. This has not always occurred however,particularly in recent years. It is thought now that the current practise of ‘rotational’ fishing on its own is probably not a sufficient strategy for the sustainable management of this fishery.
We d
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Estimates of current biomass for the Coromandel fishery are available from the 2007 dredge survey but the only reference biomass that might be calculated is average recruited biomass. Scallop biomass can be expected to vary from one year to the next, so the long-run average is difficult to estimate and not necessarily a good indicator. However, biomass estimates around the turn of the century (2000) were consistently at or near the lowest on record and it seems reasonable to conclude that the population was, for unknown reasons, at a very low ebb. In contrast, following reasonable increases in biomass, catch rate, and condition of scallops in 2003 and, especially, 2004, the biomass in 2005 (almost regardless of what was assumed about dredge efficiency) was the highest on record and probably higher than in the mid-1980’s when not all of the beds were surveyed. This remarkable resurgence was strongest at the Mercury Islands location, but most beds showed some increase in density. The 2006 survey results suggested a maintenance of the high biomass observed in 2005. The 2007 survey results show there has been a decline in the overall biomass since 2006, although thebiomass estimate is still high compared with historical records.
Uncertainty stemming from assumptions about dredge efficiency during the surveys, rates of growth and natural mortality between survey and season, and predicting the average recovery of meatweight from greenweight remain in thes
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Title: Fisheries Assessment Plenary May 2013: Stock Assessments and Yield Estimates
080_SCI_2013.pdf
(822.5 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. Scampi (SCI).
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Title: Fisheries Assessment Plenary May 2014: Stock Assessments and Stock Status. Scampi (SCI)
80_SCI_2014 FINAL.pdf
(853.3 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. Scampi (SCI)
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Title: SCAMPI (SCI) – Fisheries Assessment Plenary May 2022 Volume 3
78 SCI 2022.pdf
(17.9 MB)
SCAMPI (SCI) – Fisheries Assessment Plenary May 2022 Volume 3
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Title: Scampi (SCI) – May Plenary Report 2021 Volume 3
78 SCI 2021.pdf
(2.5 MB)
Scampi (SCI) – May Plenary Report 2021 Volume 3
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This document summarises the most recent New Zealand fishery, biological, stock assessment and stock status information about scallops in the Northland region.
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This document summarises the most recent New Zealand fishery, biological, stock assessment and stock status information about scallops in the Nelson and Marlborough regions.
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This document summarises the most recent New Zealand fishery, biological, stock assessment and stock status information about scallops in the Coromandel region.
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