WG-ASAM-2024/01 Mostrar menos información |
2024 GIS projects update CCAMLR Secretariat
Resumen:
This document summarizes ongoing work conducted by the CCAMLR Secretariat on developing standard operations for Geographic Information Systems in support of the work of the Scientific Committee and its Working Groups.
Presentado por:
Dr Stephane Thanassekos (Secretaría de la CCRVMA)
Aprobado por:
Dr David Agnew (Secretaría de la CCRVMA)
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4.1 |
WG-ASAM-2024/02 Mostrar menos información |
Development of a new C1 form for Krill Fisheries, and its potential use for vessels when collecting acoustic transect data. CCAMLR Secretariat
Resumen:
As requested by WG-FSA-2023 (paragraph 2.12), the Secretariat has begun the process of separating the C1 form into separate reporting templates for krill and finfish trawl fisheries. This paper presents a draft C1 form to WG-ASAM for discussion on the proposed inclusions to advance the revision of the krill fishery management approach and to consider whether the form can be used by Read More
Presentado por:
Mr Isaac Forster (Secretaría de la CCRVMA)
Aprobado por:
Dr David Agnew (Secretaría de la CCRVMA)
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3.3 |
WG-ASAM-2024/03 Mostrar menos información |
Updates to the CCAMLR Acoustic Data Repository CCAMLR Secretariat
Resumen:
This paper presents recent developments on the CCAMLR Acoustic Data Repository. We provide an overview of acoustic data and metadata submitted since WG-ASAM-2023 and present the data visualisation tool requested by WG-ASAM-2023. We also describe progress in testing the python package Krillscan and discuss options for future data submissions, Read More
Presentado por:
Mr Daphnis De Pooter (Secretaría de la CCRVMA)
Aprobado por:
Dr David Agnew (Secretaría de la CCRVMA)
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3.5 |
WG-ASAM-2024/04 Mostrar menos información |
A sustainable strategy for the long-term monitoring of krill populations Arata, J.A. |
3.2 |
WG-ASAM-2024/05 Mostrar menos información |
Using different sources of krill length frequency to convert acoustic backscatter to estimates of krill biomass in Subarea 48.3 Dornan, T., C. Liszka and S. Fielding
Resumen:
Krill length frequency data is essential to convert acoustic signal to krill biomass. There are several sources of krill length frequency data collected by the fishery, monitoring programmes and scientific research cruises. However, there is an inherent degree of bias with all sampling systems, and it is unclear what effect these are likely to have on acoustic estimates of Read More
Presentado por:
Dr Tracey Dornan (Reino Unido)
Aprobado por:
Dr Martin Collins (Reino Unido)
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3.3, 6 |
WG-ASAM-2024/06 Mostrar menos información |
True biomass change, not sea ice mediated survey coverage, drive differences between krill biomass estimates from surveys in 2006 and 2021 in Division 58.4.2-East Cox, M.J., N. Kelly, D. Maschette, S. Kawaguchi and P. Ziegler
Resumen:
In 2023, SC-CAMLR endorsed the krill assessment and proposed revisions to the precautionary catch limits for Divisions 58.4.1 and 58.4.2-East (para. 2.98). These assessments were based on recent biomass estimates from a 2019 survey conducted by Japan in Division 58.4.1 and a 2021 survey conducted by Australia in Division 58.4.2-East, and stock assessments using the Grym Read More
Presentado por:
Dr Martin Cox (Australia)
Aprobado por:
Dr Philippe Ziegler (Australia)
Publicación:
N/A
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4.2 |
WG-ASAM-2024/07 Mostrar menos información |
Scale of variation in Antarctic krill abundance at the South Orkney Islands (Subarea 48.2): insights from multi-scale acoustic surveys during summer 2016 Saunders, R.A. and S. Fielding
Resumen:
The South Orkney Islands (Southwest Atlantic; Subarea 48.2) is a region where Antarctic krill and krill-dependant predators are highly abundant and the commercial fishery now operates intensively. Understanding krill temporal-spatial distribution and ecosystem dynamics in the region is important for assessing appropriate krill acoustic survey designs, and for devising Read More
Presentado por:
Dr Sophie Fielding (Reino Unido)
Aprobado por:
Dr Martin Collins (Reino Unido)
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5.1 |
WG-ASAM-2024/08 Mostrar menos información |
New fishery research proposal plan under CM 24-01, paragraph 3, the acoustic-trawl survey Champsocephalus gunnari in the statistical subarea 48.2 Delegation of Ukraine
Resumen:
Mackerel icefish (Champsocephalus gunnari) is one of the most common and widespread species of Antarctic fish. That is a proposal to conduct a local acoustic-trawl survey of Champsocephalus gunnari in the statistical Subarea 48.2, Read More
Presentado por:
Dr Kostiantyn Demianenko (Ucrania)
Aprobado por:
Dr Kostiantyn Demianenko (Ucrania)
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7 |
WG-ASAM-2024/09 Mostrar menos información |
Krill for whales – Fine scale acoustic krill surveys in Area 48.1 Dornan, T., N. Nickells, R. Reisinger and S. Fielding
Resumen:
Antarctic krill are a keystone species in the Southern Ocean, supporting large populations of higher predators and a commercial fishery. As baleen whales recover from commercial exploitation, we urgently need information on predator dietary requirements and foraging locations to help inform sustainable krill fishery management. Here we outline the first of two planned fine scale krill Read More
Presentado por:
Dr Tracey Dornan (Reino Unido)
Aprobado por:
Dr Martin Collins (Reino Unido)
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6, 5.1 |
WG-ASAM-2024/10 Mostrar menos información |
Development of a workplan for conducting Krill surveys in Subarea 48.1 Arata, J.A., B. Krafft, X. Zhao, Y. Ying, E. Deehr Johannessen and A. Lowther |
3.2 |
WG-ASAM-2024/11 Mostrar menos información |
Candidate management units for the krill fishery in subarea 48.1 Warwick-Evans, V., M.A. Collins and S. Hill
Resumen:
This paper proposes an updated set of candidate management units (MUs) for application of the revised krill fishery management approach in subarea 48.1. The Spatial Overlap Analysis initially identified candidate MUs in a relatively data rich area that coincided with the footprint of the fishery during the period 1980 to 2018 and covered only 54% of Subarea Read More
Presentado por:
Dr Vicky Warwick-Evans (Reino Unido)
Aprobado por:
Dr Martin Collins (Reino Unido)
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4.1 |
WG-ASAM-2024/12 Mostrar menos información |
Automating length and maturity stage measurements of Antarctic Krill (Euphausia superba) from high resolution image pairs Gudelis, M., M. Mackiewicz, D. Greenwood, J. Bremner and S. Fielding
Resumen:
Deep learning architecture was used to train a model to classify the maturity stage of Antarctic krill and measure their total length. These parameters are key variables in the methods for managing the Antarctic krill fishery employed by the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR). Images of Antarctic krill in both lateral and dorsal Read More
Presentado por:
Dr Sophie Fielding (Reino Unido)
Aprobado por:
Dr Martin Collins (Reino Unido)
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3.3 |
WG-ASAM-2024/13 Mostrar menos información |
Acoustic determination of Antarctic krill biomass at South Georgia (Subarea 48.3) during winter: results from two winter seasons Liszka, C.M., T. Dornan, S. Fielding and M.A. Collins
Resumen:
During the austral winters of 2022 and 2023, six acoustic surveys were carried out to estimate the biomass and distribution of Euphausia superba (Antarctic krill) on the northern shelf of South Georgia. Surveys were undertaken in May, July and September 2022 and April, July and September 2023, corresponding with the beginning, middle and end of the krill fishing Read More
Presentado por:
Dr Cecilia Liszka (Reino Unido)
Aprobado por:
Dr Martin Collins (Reino Unido)
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5.1, 3.3 |
WG-ASAM-2024/14 Mostrar menos información |
Acoustic blind zone when using hull mounted transducers during traditional krill biomass surveys Zhang, G. and B.A. Krafft
Resumen:
Krill perform diurnal vertical movements (DVM) depending on a range of factors, but the general perception is that at least in areas and time of season where krill are exposed to a high degree of predation from smaller visual predators, they tend to stay higher in the water column during night hours. During traditional acoustic ship surveys aimed Read More
Presentado por:
Dr Guosong Zhang (Noruega)
Aprobado por:
Dr Bjørn Krafft (Noruega)
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3.2 |
WG-ASAM-2024/15 Mostrar menos información |
Preliminary results from the acoustic surveys of Antarctic krill conducted by the Chinese fishing vessels in Subarea 48.1 during austral winter 2023 and summer 2024 Wang, X., J. Zhang, G. Fan, J. Wang, J. Zhu and X. Zhao
Resumen:
Since the 2012/13 fishing season, the Chinese krill fishing vessels have been conducting annual acoustic survey on Antarctic krill in Subarea 48.1. To facilitate the implementation of revised new krill management approach, additional efforts were devoted to the annual survey with survey area further extended covering the strata of the Gerlache Strait (GS), Joinvile Island ( Read More
Presentado por:
Dr Xinliang Wang (China)
Aprobado por:
Dr Xianyong Zhao (China)
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4.3, 5.1, 3.2 |
WG-ASAM-2024/P01 Mostrar menos información |
Krill biomass estimation: Sampling and measurement variability Bairstow, F., S. Gastauer, S. Wotherspoon, C.T.A. Brown, S. Kawaguchi, T. Edwards and M.J. Cox
Resumen:
Krill are the subject of growing commercial fisheries and therefore fisheries management is necessary to ensure long-term sustainability. Krill catch limits, set by Commission for the Conservation of Antarctic Marine Living Resources, are based on absolute krill biomass, estimated from acoustic-trawl surveys. In this work, we develop a method for determining an error budget Read More
Presentado por:
Dr Martin Cox (Australia)
Aprobado por:
Dr Philippe Ziegler (Australia)
Publicación:
Bairstow F, Gastauer S, Wotherspoon S, Brown CTA, Kawaguchi S, Edwards T and Cox MJ (2022) Krill biomass estimation: Sampling and measurement variability. Front. Mar. Sci. 9:903035. pp 19 doi: 10.3389/fmars.2022.903035
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3.3 |