WG-ASAM-2024

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.

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
Submitted By:
Mr Isaac Forster (CCAMLR Secretariat)

Approved By:
Dr David Agnew (CCAMLR Secretariat)

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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
Submitted By:
Mr Daphnis De Pooter (CCAMLR Secretariat)

Approved By:
Dr David Agnew (CCAMLR Secretariat)

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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
Submitted By:
Dr Tracey Dornan (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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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
Submitted By:
Dr Martin Cox (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

Publication:
N/A

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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
Submitted By:
Dr Sophie Fielding (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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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
Submitted By:
Dr Kostiantyn Demianenko (Ukraine)

Approved By:
Dr Kostiantyn Demianenko (Ukraine)

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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
Submitted By:
Dr Tracey Dornan (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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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
Submitted By:
Dr Vicky Warwick-Evans (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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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
Submitted By:
Dr Sophie Fielding (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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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
Submitted By:
Dr Cecilia Liszka (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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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
Submitted By:
Dr Guosong Zhang (Norway)

Approved By:
Dr Bjørn Krafft (Norway)

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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
Submitted By:
Dr Xinliang Wang (China)

Approved By:
Dr Xianyong Zhao (China)

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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
Submitted By:
Dr Martin Cox (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

Publication:
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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