WG-ASAM-2022

We provide R code to aid in the creation of CCAMLR management strata and the computation of their areas, using the boundaries that were proposed in 2021 for the management of the krill fishery in Subarea 48.1 as an example.

The ROSSKRILL project gave the opportunity to perform a large-scale acoustic survey in western Ross Sea, after a time gap of many years lasting since 2004. In the meanwhile, this area saw the establishment of the largest MPA in the world, and it will be very interesting to compare recent results with the past ones. The survey was performed in January 2022 on board R/V Laura Bassi, and during Read More
Soumis par:
Andrea De Felice

Approuvé par:
Marino Vacchi (Italie)

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Mackerel icefish (Champsocephalus gunnari) is one of the most common and widespread species of Antarctic fish. Ukraine proposes to conduct a local acoustic-trawl survey of Champsocephalus gunnari in the statistical Subarea 48.2. The main objective of the research is to determine the distribution and the abundance of Read More
Soumis par:
Kostiantyn Demianenko (Ukraine)

Approuvé par:
Kostiantyn Demianenko (Ukraine)

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With the aim to provide information on krill dynamics, SG-ASAM has agreed on several nominated transects with higher priority for collecting acoustic data by fishing vessels across Subarea 48.1 to 48.3. Here we provide information on the acoustic surveys on the nominated transects in Subarea 48.3 undertook by the Chinese krill Read More
Soumis par:
Xinliang Wang (Chine)

Approuvé par:
Xianyong Zhao (Chine)

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The implementation of the Scientific Committee recommendations to develop the standardized methods for processing and reporting future acoustic survey results requires clarity on some methodological aspects of acoustic survey. Furthermore, it is important to streamline the system of krill acoustic surveys carried out in the CCAMLR area.

In view of Read More
Soumis par:
Svetlana Kasatkina (Fédération de Russie)

Approuvé par:
Svetlana Kasatkina (Fédération de Russie)

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In this paper, the authors consider inter-vessel variability in the length composition of krill in catches from research and commercial catches  in the context of gear designs and the efficiency of observer sampling design in krill fishery.  Analysis was provided using data obtained in the local fishing ground within several days to exclude any Read More
Soumis par:
Svetlana Kasatkina (Fédération de Russie)

Approuvé par:
Svetlana Kasatkina (Fédération de Russie)

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The Chinese krill fishing vessels have been conducting annual acoustic survey on Antarctic krill in Subarea 48.1 since the 2013/2014 fishing season. Krill biomass estimates from these surveys provided important information for understanding the variation of krill stock in summer seasons. Here the preliminary results on krill distribution from the acoustic survey in Subarea 48 Read More
Soumis par:
Xinliang Wang (Chine)

Approuvé par:
Xianyong Zhao (Chine)

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Here we examine the variability in the conversion factor, C, that scales Nautical Area Scattering Coefficient (NASC) values of krill echoes to krill areal biomass density. Specifically, we Read More
Soumis par:
Martin Cox (Australia)

Approuvé par:
Philippe Ziegler (Australia)

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The Scientific Committee endorsed the recommendation by WG-ASAM to have the Secretariat create a central repository for acoustic data collected by fishing vessels along nominated transects (SC-CAMLR-40 paragraph 2.10). We provide an overview of the raw acoustic data collected by fishing vessels currently available from the Secretariat and describe how these data are stored. Following the Read More
Soumis par:
Daphnis De Pooter (Secrétariat de la CCAMLR)

Approuvé par:
David Agnew (Secrétariat de la CCAMLR)

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In 2021 four krill fishing vessels undertook nominated CCAMLR transects T9, T10 and T11 on the northeast shelf (ECB), and T6 and T8 at the northwest shelf (WCB) of South Georgia. Transects from the ECB were undertaken in June and August, whilst those within the WCB only in August. Guidelines were provided with two tasks (1) a bottom calibration area for inter-vessel Read More
Soumis par:
Sophie Fielding (Royaume-Uni)

Approuvé par:
Chris Darby

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Standardised methods for processing and reporting kill acoustic survey results to CCAMLR are proposed.

During February 2022 the Cargo Vessel “Antarctic Provider” was used to conduct the annual Norwegian Institute of Marine Research survey covering 5 north/south transects off South Orkney Islands. This survey represents the eleventh survey carried out since 2011, using the same type of method design and timing. It Read More
Soumis par:
Gavin Macaulay

Approuvé par:
Bjørn Krafft (Norvège)

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The Scientific Committee requested DSAG to review the Rules for access and use of CCAMLR Data, which was presented for consideration at the Scientific Committee symposium. This document describes the implementation of the Rules for Access and use of CCAMLR Data into the CCAMLR Data Request procedure and the procedure for Read More
Soumis par:
Anton Van de Putte (Belgique)

Approuvé par:
Anton Van de Putte (Belgique)

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During austral summer 2018/2019, we deployed an array of six submerged moorings equipped with Nortek Signature100 integrated wideband echosounder and acoustic Doppler current profilers (ADCPs) on the continental shelf of the northern Antarctic Peninsula. Acoustic data from these instruments were used to classify targets, estimate water flow and the biomass of Antarctic krill (Euphausia superba Read More
Soumis par:
George Cutter (États-Unis d'Amérique)

Approuvé par:
George Watters (États-Unis d'Amérique)

Publication:
Front. Mar. Sci., 9 (2022): 784469, doi: 10.3389/fmars.2022.784469

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This study was performed to aid the management of the fishery for Antarctic krill Euphausia superba. Krill are an important component of the Antarctic marine ecosystem, providing a key food source for many marine predators. Additionally, krill are the target of the largest commercial fishery in the Southern Ocean, for which annual catches have been increasing and concentrating in Read More
Soumis par:
Sophie Fielding (Royaume-Uni)

Approuvé par:
Chris Darby

Publication:
Polar Biol., 45 (2022): 857–871

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