WG-FSA-2022

The Scientific Committee requested DSAG to review the Rules for Access and Use of CCAMLR Data for consideration by the Scientific Committee symposium and the Working Groups during their meetings in 2022. This document summarises the feedback received review during the Scientific Committee Symposium 2022, WG-ASAM 2022, WG-SAM 2022, WG EMM 2022, and the Data Read More
Submitted By:
Dr Anton Van de Putte (Belgium)

Approved By:
Dr Anton Van de Putte (Belgium)

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The Secretariat received fishery notifications for research fisheries, exploratory fisheries for toothfish and krill fisheries for 2022/23 CCAMLR season. This paper provides a summary of all fishery notifications, with full details available to authenticated users through the CCAMLR website Fishery Notifications.

As requested by WG-FSA-2019, a reconciliation was undertaken for all available data between the Dissostichus spp. Catch Documentation Scheme (CDS) and monthly fine-scale catch and effort data. The analysis identified that at a season level, the reconciliations had a difference of less than 5%. Further, the majority of these seasonal differences were less than 1%, with a fishery-level Read More
Submitted By:
Ms Doro Forck (CCAMLR Secretariat)

Approved By:
Dr David Agnew (CCAMLR Secretariat)

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The results of the practical revision of approaches to developing fisheries management in Subarea 48.1 undertaken by the Working Groups in response to the Commission's recommendations (CCAMLR-38, paragraph 5.17) highlight the lack of adequate scientific information to develop sound fisheries Read More
Submitted By:
Dr Svetlana Kasatkina (Russian Federation)

Approved By:
Dr Svetlana Kasatkina (Russian Federation)

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This paper presents a brief overview of catches of target species from directed fishing on toothfish, icefish and krill in the Convention Area in 2020/21 and 2021/22 seasons and from research fishing under Conservation Measure (CM) 24-05. The CCAMLR fisheries catch limits and associated monthly catches in the 2021/22 season are also presented with dates of fisheries closures implemented by the Read More
Submitted By:
Ms Doro Forck (CCAMLR Secretariat)

Approved By:
Dr David Agnew (CCAMLR Secretariat)

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Some aspects of acoustic- trawl surveys for the mackerel icefish (Champsocephalus gunnari) assessment in the CCAMLR Statistical Subarea 48.3 as fish with a semi-pelagic distribution are discussed.

            It is proposed that Read More
Submitted By:
Dr Svetlana Kasatkina (Russian Federation)

Approved By:
Dr Svetlana Kasatkina (Russian Federation)

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Electronic Monitoring (EM) offers the potential to reduce CCAMLR scientific observer tasking onboard vessels, while improving data quality, increasing data collection and improving observer safety. Fisheries observers should be utilised to fulfil and integrate the reporting requirements carried out by EM on these vessels, using a holistic approach. In the mid to longer Read More
Submitted By:
Ms Georgia Robson (United Kingdom)

Approved By:
Dr Chris Darby

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Here we outline a proposal for a workshop to enhance the CCAMLR Ecosystem Monitoring Programme (CEMP) based on recommendations arising from WG-EMM-2022.

Working group paper WG-EMM-2022/15 (see Annex) was presented at this year’s EMM Meeting. The paper gives detailed information regarding the discovery of a breeding colony of notothenioid icefish (Neopagetopsis ionah, Nybelin 1947) of so far unprecedented extent observed in the southern Weddell Sea (Purser et al., 2022) during RV Polarstern expedition PS124 from February to Read More
Submitted By:
Dr Marc Eléaume (France)

Approved By:
Dr Marc Eléaume (France)

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Analysis of the frequency of fish by-catch in vessel and observer data from the krill fishery is updated based on recommendations from WG-FSA-2021. A preliminary approach to estimating by-catch rates (kg fish per tonne of krill) is introduced, and, spatial and temporal patterns of fish by-catch are presented. Feedback on the approach, outlier removal method and future work is requested.

This paper provides an update on issues identified in krill fishery data related to the reporting of by-catch data from Chilean and Ukrainian vessels, green weight estimation parameters reported from the Chilean vessel Betanzos and the Norwegian vessel Juvel, and the allocation of catch amounts to two-hourly trawl periods for continuous trawling vessels. For all Read More
Submitted By:
Mr Isaac Forster (CCAMLR Secretariat)

Approved By:
Dr David Agnew (CCAMLR Secretariat)

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This paper details the circumstances of catch limit overruns for toothfish fisheries in Subareas 88.1 and 88.2 and krill fisheries in Subarea 48.1 from 2018 to 2022 seasons, as requested by the WG-FSA 2021.

This paper presents an analysis of the risk of exceeding catch limits in the krill fishery based on daily reporting compared to the current practice of five-day reporting to evaluate whether reporting requirements required revision. In this paper the Secretariat presents the risk profiles of exceeding catch Read More
Submitted By:
Mr Henrique Anatole (CCAMLR Secretariat)

Approved By:
Dr David Agnew (CCAMLR Secretariat)

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During April 2022, the annual random stratified trawl survey (RSTS) around Heard Island and McDonald Islands (HIMI) was conducted in CCAMLR Division 58.5.2, with the completion of 165 Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

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The annual random stratified trawl survey was undertaken in Division 58.5.2 in the vicinity of Heard Island and McDonald Islands during April 2022. Based on data from this survey, this paper provides a preliminary assessment for mackerel icefish (Champsocephalus gunnari) population structure, abundance and yield in Division 58.5.2 using standard CCAMLR methods (CMIX Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

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Based on a recommendation by WG-FSA-2021 we present an update on stock parameters, including recruitment indices from the random stratified trawl survey, and Chapman estimates of vulnerable biomass from tag-recapture data for the Patagonian toothfish (Dissostichus eleginoides) fishery in CCAMLR Division 58.5.2. These data indicate that the stock trajectory is Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

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This paper provides an overview of the deployments of Conductivity, Temperature and Depth (CTD) loggers and Benthic Video Cameras (BVCs) to fishing gear in the Dissostichus mawsoni exploratory fishery in Divisions 58.4.1 and 58.4.2 since 2015/16.  This report on the collection of environmental data addresses Milestone 2 of the research plan in this fishery Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

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This document summarizes the method used to link releases and recaptures of tagged toothfish and skates in the Convention Area, and the current state of the database of linked tags held by the CCAMLR Secretariat. Thanks to improvements in data quality and the growing use of CCAMLR tags by Members, the quality of links has increased with time. To date, over 98% of recaptured fish have been Read More
Submitted By:
Dr Stéphane Thanassekos (CCAMLR Secretariat)

Approved By:
Dr David Agnew (CCAMLR Secretariat)

Using Generalized Additive Mixed Models, factors recorded by SISO observers and influencing toothfish conversion factors (CFs) were examined. For both Dissostichus species, fish length, fishing location, timing and vessel were found to have signigicant effects on CFs. The relative effect of each factor differed between species, as well as the shape of their relationship with CFs, although Read More
Submitted By:
Dr Stéphane Thanassekos (CCAMLR Secretariat)

Approved By:
Dr David Agnew (CCAMLR Secretariat)

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We present results of the trend analysis following reviews by WG-SAM-2022. Biomass estimates for research blocks in data-limited toothfish fisheries and the resulting catch limits for the 2023 season have been determined using updated trend analysis decision rules.

CCAMLR monitors marine debris in the Convention Area through the Marine Debris Monitoring Program (MDMP) established in 1986. The MDMP compiles data from surveys and opportunistic sightings conducted by Members, fishing gear reported by CCAMLR Scheme of International Scientific Observation (SISO) observers as lost by fishing vessels, and marine debris observed Read More
Submitted By:
Ms Claire van Werven (CCAMLR Secretariat)

Approved By:
Dr David Agnew (CCAMLR Secretariat)

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F/V Tronio conducted CTD deployments in subarea 48.6 during February-March in 2020 and 2021, using two Valeport FastCTD Profilers. The number of stations with good quality data were 14 and 13 respectively. Those data are not sufficient to analyze T and S by research block (RB). Therefore, CTD data available from other datasets of the study area were also Read More
Submitted By:
Mr Roberto Sarralde Vizuete (Spain)

Approved By:
Mr Roberto Sarralde Vizuete (Spain)

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The Antarctic toothfish (Dissostichus mawsoni), a notothenioid, is endemic to the Southern Ocean and supports economically important long line fisheries. Stock discrimination is a central component of fisheries management which embraces the recognition of self-sustaining components within natural populations. The stock structure of Dissostichus mawsoni in Read More
Submitted By:
Mr Roberto Sarralde Vizuete (Spain)

Approved By:
Mr Roberto Sarralde Vizuete (Spain)

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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
Submitted By:
Dr Kostiantyn Demianenko (Ukraine)

Approved By:
Dr Kostiantyn Demianenko (Ukraine)

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The Antarctic toothfish is the largest notothenioids species in the Southern Ocean, playing a key ecological role in the trophic web, as food source for marine mammals, and as top predator in deep-sea ecosystems, structuring the population dynamics of its prey through a trophic cascade. Most ecological information on this species rely on samples from areas Read More
Submitted By:
Mr Francisco Santa Cruz (Chile)

Approved By:
Dr César Cárdenas (Chile)

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Elasmobranchs (sharks, skates and rays) are among the least productive fish species, which make their populations vulnerable to increased mortality. Although skates exhibit elevated vulnerability to fishing, they are commonly caught as incidental bycatch in demersal fisheries. Management measures to prevent the decline of skate populations often Read More
Submitted By:
Ms Johanna Faure

Approved By:
Dr Marc Eléaume (France)

Skates are commonly captured as bycatch in the Patagonian toothfish (Dissostichus eleginoides) fishery occurring between 500-2000 m in Crozet and Kerguelen waters. Age data is then important to perform fishery assessment and management. However, previous age estimation on closely related species has proved to be difficult due to low calcification Read More
Submitted By:
Ms Johanna Faure

Approved By:
Dr Marc Eléaume (France)

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In this paper, we report on fish bycatch during exploratory fishing activities undertaken in Divisions 58.4.1 and 58.4.2 during the period 2016 to 2022. Fish bycatch was composed of at least 14 species or species groups. In 2021 and 2022, exploratory fishing occurred in Division 58.4.2 only, and none of the bycatch limits set in CM 33-03/A were reached. Read More
Submitted By:
Dr Clara Péron (France)

Approved By:
Dr Marc Eléaume (France)

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Trends in finfish by-catch from the krill fishery using data reported from the fine-scale catch and effort (C1) data from 2010 to 2021 are characterized. Finfish by-catch in relation to annual reported weight, species composition and trawl technique, by subarea and Small Scale Management Units (SSMUs) is examined. The reported finfish by-catch and species composition was Read More
Submitted By:
Dr Christopher Jones (United States of America)

Approved By:
Dr George Watters (United States of America)

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A preliminary integrated stock assessment model with considering migration between northern and southern research blocks (two-area population model) was constructed for Dissostichus mawsoni at the Subarea 48.6, using the latest data collected from blocks 2 – 5. The model is identical in scenarios about IUU fishing and depredation, and biological Read More
Submitted By:
Dr Takehiro Okuda (Japan)

Approved By:
Dr Taro Ichii

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This paper represents the report of a multi-member longline research fishing on Antarctic toothfish (Dissostichus mawsoni) in Subarea 48.6 between 2012/13 and 2021/22 fishing seasons by Japan, Spain, and South Africa. From 2012/13, the current proposal (2020/21-2022/23) is the forth of all research proposals in Subarea 48.6, namely 1st: 2012/13-2014/15 Read More
Submitted By:
Dr Takehiro Okuda (Japan)

Approved By:
Dr Taro Ichii

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This paper examined egg and larval transport under different SAM phases in the continental shelf-slope regions of East Antarctica using particle tracking models following the study by Mori et al. (2021). While ocean data outputs used for simulations were the same as in the last study (i.e., “COCO”), temporal and spatial resolutions of data increased in this experiment Read More
Submitted By:
Dr Mao Mori

Approved By:
Dr Taro Ichii

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A research plan for Subarea 88.3 was commenced by Korea in 2016 under CM 24-01, New Zealand joined the proposal in 2017. The joint research proposal was for 3 years covering the period 2017/18, 2018/19 and 2019/20. It was designed to build on Korea’s previous research Read More
Submitted By:
Dr Sangdeok Chung (Korea, Republic of)

Approved By:
Dr Jaebong Lee (Korea, Republic of)

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The stocks of Antarctic toothfish, Dissostichus mawsoni were a relatively economically and ecologically important fishery resource in the waters Read More
Submitted By:
Dr Sangdeok Chung (Korea, Republic of)

Approved By:
Dr Jaebong Lee (Korea, Republic of)

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The dietary compositions of Antarctic toothfish, Dissostichus mawsoni from various research blocks in Area 88 were analyzed for three years from 2019 to 2022 using metabarcoding. As a result of metabarcoding with 1,348 stomach contents, a total of 158 prey haplotypes were obtained which belonged to 33 families and 58 genera. As shown from the previous study Read More
Submitted By:
Dr Sangdeok Chung (Korea, Republic of)

Approved By:
Dr Jaebong Lee (Korea, Republic of)

Request Meeting Document

The Antarctic toothfish, Dissostichus mawsoni, serves as a valuable fishery resource around the Antarctic Ocean, which has been managed by the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) since 1997. Although defining genetic population structure of this species is crucial for improving fishery management, its number of Read More
Submitted By:
Dr Sangdeok Chung (Korea, Republic of)

Approved By:
Dr Jaebong Lee (Korea, Republic of)

Request Meeting Document

CCAMLR’s Scientific Committee and its working groups are developing a revised management approach for the Antarctic krill fishery in Subareas 48.1 to 48.4. A critical phase is the development of an interim approach that can be applied to Subarea 48.1 to update the measures within CM-51-07, which expires before the next (2022/23) krill fishing season. Progress has been made in Read More
Submitted By:
Dr Simeon Hill (United Kingdom)

Approved By:
Dr Chris Darby

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Evaluating the effects of climate change on Antarctic marine living resources is a priority topic for CCAMLR and was identified by the 2022 Scientific Committee Symposium as a key area of research. Acknowledging the need to better coordinate, target and integrate scientific advice on climate change, and recognising that a focused workshop would enable progress to be made, this paper recommends Read More
Submitted By:
Dr Phil Hollyman

Approved By:
Dr Chris Darby

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During three fishing seasons 2018/19, 2019/20 and 2020/21 Ukrainian vessel CALIPSO (Fig. 1) conducted the research survey in Statistical Subarea 48.1 (Western part of the Weddell Sea). During the indicated period of research fishing Read More
Submitted By:
Mr Pavlo Zabroda

Approved By:
Dr Kostiantyn Demianenko (Ukraine)

Request Meeting Document

In the present paper, we report progress since WG-FSA-2021 on the development of statistical modeling to estimate the abundance trends of grenadiers caught as bycatch in the longline fisheries in CCAMLR Subarea 48.6. This work relies on spatio-temporal delta generalized linear mixed models (GLMMs) implemented with R package “VAST”. We recommend that future studies keep Read More
Submitted By:
Dr Kota Sawada (Japan)

Approved By:
Dr Taro Ichii

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We present an update of ageing and estimates of biological parameters, and of the integrated stock assessment for Antarctic toothfish (Dissostichus mawsoni) fishery in CCAMLR Divisions 58.4.1 and 58.4.2. The update of ageing and estimates of biological parameters addresses Milestone 1.10, the updated of the stock assessment addresses Milestone 1.11 of the current Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

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Assessment of the Precautionary Harvest Rate (Gamma) for the Antarctic krill in Subarea 48.1 was still to be finalized largely due to the proportional recruitment parameters which are key inputs of the Grym. The current mostly discussed proportional recruitment parameter estimates were based on the entire US AMLR summer survey time series but with Read More
Submitted By:
Dr Yi-Ping Ying (China)

Approved By:
Dr Xianyong Zhao (China)

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The local stock structure of Antarctic toothfish (Dissostichus mawsoni) in some Research Blocks (RBs) of Subarea 48.6 has been investigated in Wei et al. (2018), but this study has not included the RB 48.6_5 into the analysis and the stock connectivity between RBs has also not examined. Therefore, this study is aimed to update the information about stock Read More
Submitted By:
Professor Guoping Zhu (China)

Approved By:
Dr Xianyong Zhao (China)

Request Meeting Document

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
Submitted By:
Dr Svetlana Kasatkina (Russian Federation)

Approved By:
Dr Svetlana Kasatkina (Russian Federation)

Request Meeting Document

We analyzed data provided by Secretariat on fish tagged and subsequent recaptures  in Subareas 88.1 and 88.2 during the period 2009-2017.

In our opinion, it will be possible to improve the tagging data in the toothfish fishery by moving the dimensions of the Read More
Submitted By:
Dr Svetlana Kasatkina (Russian Federation)

Approved By:
Dr Svetlana Kasatkina (Russian Federation)

Request Meeting Document

Based on a series of significant progress made by SC-CAMLR towards a sound science-based krill management approach since 2019, at its annual meeting in 2021 the Commission endorsed the rollover of CM 51-07 for one year to provide time to consolidate the revision of the new approach in Subarea 48.1. To facilitate discussion and decision-making towards the revision Read More
Submitted By:
Dr Xianyong Zhao (China)

Approved By:
Dr Xianyong Zhao (China)

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The time series of relative abundance and age structure from the Ross Sea shelf survey provides information about year class strength, variability, and autocorrelation, and hence is an important input into the Ross Sea stock assessment.

The objectives of the survey were to (i) continue monitoring trends in Antarctic toothfish ( Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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This paper proposes a continuation of the Ross Sea shelf survey (RSSS) for three years from 2023–2025. The primary objective (1) of the survey is to monitor Antarctic toothfish recruitment in the southern Ross Sea. This would be a continuation of the annual time series of research surveys carried out since 2012 using a random stratified design. Continuing the time series is Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

Request Meeting Document

A 2-year programme was implemented in the 2019/20 and 2020/21 fishing seasons in the Ross Sea region to tag and release skates for population size estimation and to validate the thorn ageing method for Antarctic starry skate (Amblyraja georgiana). The program has been largely successful to date, with a total of 8990 skates tagged and released during the two fishing Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

Request Meeting Document

In the 2019/20 and 2020/21 fishing years, Antarctic starry skates (Amblyraja georgiana) were tagged with the antibiotic terramycin (oxytetracycline hydrochloride, OTC) or strontium chloride (SrCl₂) for a mark-recapture programme established to estimate population size and validate caudal thorn ageing techniques. Of the 4900 tagged Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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The Workshop on the Ross Sea Data Collection Plan (WS-RSDCP) was held online from 11 to 12 August 2022. The Workshop was co-convened by Dr L. Ghigliotti (Italy) and Mr N. Walker (New Zealand) and supported by the CCAMLR Secretariat. Scientists from 11 Members attended the Workshop.

The long-term goals of the Ross Sea fishery based on Article II of CCAMLR can be summarised as: the target fished population is above a level which ensures stable recruitment; the ecological relationships between harvested, dependent, and related populations are maintained; and, prevention of changes or minimisation of the risk of changes in the marine ecosystem that are not Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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The aim of this paper is to review the management of the Ross Sea toothfish fishery and progress made under the 2014 medium-term research plan (MTRP). The paper focuses primarily on Antarctic toothfish, as catches of Patagonian toothfish are negligible, and covers Subarea 88.1 and Subarea 88.2 SSRUs 88.2A and B, including the linkages with the Amundsen Sea. We begin by summarising Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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This paper provides a summary of trends in performance indicators, including catches, fishing effort, catch rates, fish size, sex ratios and fish body condition, for the main bycatch species/species groups in the longline fishery targeting Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea region (RSR) (Subareas 88.1 and Small-Scale Research Units (SSRUs) 88.2A–B Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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In this paper, we employ the VAST (vector autoregressive spatio-temporal) modelling approach to predict spatio-temporal changes in macrourid bycatch in the Ross Sea region (RSR) toothfish fishery. We re-estimated the VAST models for Macrourus whitsoni and M. caml presented to WG-SAM-2022, using catch rate data collected by scientific observers up to the 2021 Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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We summarise fishing catch and fishing effort in the Ross Sea region (Subarea 88.1 and Small-Scale Research Units (SSRUs) 88.2A-B)) together with biological characteristics of the catch of Antarctic toothfish (Dissostichus mawsoni) through the 2021–22 fishing season. The implementation of the Ross Sea region Marine Protected Area (RSrMPA) from 1<sup>st Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

Request Meeting Document</sup>

The toothfish fishery in the Amundsen Sea region is operating under a research plan developed by the Scientific Committee in 2014 designed to provide data to support a two-area stock assessment model. The slope and shelf area within the Amundsen Sea (Small-Scale Research Units 882C-G) is showing improvements in tag recaptures within the four research blocks. Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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This paper provides a summary of deployment information for all observers on board vessels in the CCAMLR Convention Area appointed under the terms of SISO during the 2022 season, and an update on the development and implementation of commercial data forms and manuals.

A draft workplan to develop a Management Strategy Evaluation for the CCAMLR Trend Analysis Rules and alternative data-limited approaches for managing toothfish fisheries under research plans is presented for discussion by WG-FSA. We propose to develop models to simulate toothfish populations as a first step to testing how the management system performs relative Read More
Submitted By:
Dr Stéphane Thanassekos (CCAMLR Secretariat)

Approved By:
Dr David Agnew (CCAMLR Secretariat)

Request Meeting Document

This paper describes the continued development of a tool for generating simulated multiyear surveys from longline C2 data containing catch, effort and observer sampling observations, first described in WG-SAM 22/16. Following feedback from CCAMLR-SAM-22 additional features are described in this paper.

Read More
Submitted By:
Ms Georgia Robson (United Kingdom)

Approved By:
Dr Chris Darby

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This paper provides a summary of catch and effort in the Patagonian toothfish (Dissostichus eleginoides) fishery around South Georgia (Subarea 48.3), together with more detailed description of the biological characteristics of the catch of Patagonian toothfish between the 1995/96 and 2020/21 fishing seasons. The analysis and data summary provides the Read More
Submitted By:
Ms Georgia Robson (United Kingdom)

Approved By:
Dr Chris Darby

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Assessment of the Patagonian toothfish (D. eleginoides) in Subarea 48.3 indicates that the current status of the stock is at 47% of B₀. Projections indicate that a constant catch of 1,970 tonnes in the 2023 and 2024 seasons would be consistent with the CCAMLR decision rule after accounting for recent Read More
Submitted By:
Dr Timothy Earl (United Kingdom)

Approved By:
Dr Chris Darby

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This paper presents the diagnostics associated with the CASAL 48.3 Patagonian toothfish assessment. The age raising diagnostic plots are show in Appendix 1.

This paper extends the work of Marsh et al. 2022 presented at WG-SAM-22 to compare the influence of two age datasets in the estimation of maturity at age and expected length at age of Patagonian toothfish (Dissostichus eleginoides) in Subarea 48.3. To provide coverage of the full length-class distribution of the catch in toothfish age data, methods for sampling Read More
Submitted By:
Ms Georgia Robson (United Kingdom)

Approved By:
Dr Chris Darby

Request Meeting Document

The biomass of Antarctic toothfish (Dissostichus mawsoni) in CCAMLR Subarea 48.4 is estimated from tagging returns, giving a five-year average of 1,110 tonnes since 2018. Applying the CCAMLR agreed precautionary assumption of a 5-year average biomass, and harvest rate of γ = 0.038, implies a 2023 yield of 42 tonnes.

Read More
Submitted By:
Ms Georgia Robson (United Kingdom)

Approved By:
Dr Chris Darby

Request Meeting Document

Attached is a revised and updated CCAMLR VME Taxa Classification Guide.

We recommend that this revised VME Taxa Classification Guide replaces the existing guide as part of the information provided by CCAMLR for Technical Coordinators and Scientific Observers ( Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

Request Meeting Document

Helminths of 12 fish species collected near the South Orkney Islands, West Antarctica, were studied from December 2020 till March 2021 during the research trip on the Ukrainian krill fishing trawler “More Sodruzhestva” (CCAMLR statistical subarea 48.2). In the whole sample of 115 fish specimens, we identified one species of Monogenea, 5 species of Trematoda, 4 species of Read More
Submitted By:
Dr Kostiantyn Demianenko (Ukraine)

Approved By:
Dr Kostiantyn Demianenko (Ukraine)

Publication:
Zoodiversity, 56 (2) (2022), doi: https://doi.org/10.15407/zoo2022.02.135

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Mackerel icefish, Champsocephalus gunnari, is a species of ecological and commercial importance and is the primary predator of Antarctic krill (Euphausia superba). Therefore, elucidating the trophic linkage between C. gunnari and its exclusive prey can provide a model for the trophic relationship between a predator and its prey in Read More
Submitted By:
Professor Guoping Zhu (China)

Approved By:
Dr Xianyong Zhao (China)

Publication:
Fish. Res., 253 (2022): 106366

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Accurate species identification of harvested fishes is a central, yet often overlooked, component of fishery monitoring. This study examined the efficacy of using otolith shape to differentiate between the morphologically similar grenadiers Macrourus caml and M. whitsoni and validate species identifications by fishery observers within and adjacent to the Ross Sea region, Antarctica. Otolith Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

Publication:
Fish. Res., 253 (2022) 106370, doi: https://doi.org/10.1016/j.fishres.2022.106370

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The grenadiers Macrourus caml and M. whitsoni form a significant bycatch component of fisheries for Antarctic toothfish (Dissostichus mawsoni) in the Southern Ocean. A lack of species-level biological and catch data has to date hindered the development of quantitative assessments for these deepwater species. This paper examines species- and sex-specific life histories of M. caml andM. whitsoni Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

Publication:
Front. Mar. Sci., 9: 968848, doi: 10.3389/fmars.2022.968848 (in press.)

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Removal of fish from gear by marine predators, known as depredation, is a fishery dependent mortality that needs to be included in stock assessments for affected stocks to avoid misestimation of the assessed resource. Toothed whales engage regularly in depredation from longlines, and while in some regions they leave clear marks of depredation activity, in the longline fisheries in the Southern Read More
Submitted By:
Ms Georgia Robson (United Kingdom)

Approved By:
Dr Chris Darby

Publication:
ICES J. Mar. Sci., 78 (10) (2021): 3817–3833, doi: https://doi.org/10.1093/icesjms/fsab212

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Exploratory fishing for Antarctic toothfish (Dissostichus mawsoni) in East Antarctica (Divisions 58.4.1 and 58.4.2) began in 2003. While preliminary integrated stock assessments have been developed for these Divisions, robust estimates of stock biomass and precautionary catch limits according to CCAMLR decision rules remain to be determined. Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

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