WG-FSA-2023

The Secretariat received fishery notifications for exploratory fisheries for toothfish and krill fisheries for 2023/24 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 recommended by SC-CAMLR at its 2022 meetings (SC-CAMLR-41 paragraph 4.39), an independent review of CCAMLR toothfish stock assessments was conducted in August 2023. The review was conducted by a panel of three independent reviewers provided by the Centre for Independent Experts. The review considered the assessments for Dissostichus eleginoides in CCAMLR Subarea 48.3, 48.4 and 58.5.2 and D Read More
Submitted By:
Ms Mariana Cordeiro (CCAMLR Secretariat)

Approved By:
Dr Steve Parker (CCAMLR Secretariat)

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This paper might be taken under agenda item number 8 on other business in WG-FSA

With the need to monitor and model human induced climate change, an important requirement is the collection of relevant, accurate, and timely data to inform oceanic changes.

While sea-surface data in various forms is generally available from satellite data and other sources such as the Argo system, obtaining Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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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 ( Read More
Submitted By:
Ms Claire Van Werven (CCAMLR Secretariat)

Approved By:
Mr Todd Dubois (CCAMLR Secretariat)

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This work is a synthesis of field data on the use of the SAGO Extreme system on board the Uruguayan fishing vessel Ocean Azul. The campaign was carried out during November and December 2022, in CCAMLR subarea 58.7. The impact of predation was assessed by contrasting the catch per unit effort (CPUE, fish weight/hooks) for fishing lines retrieved in the presence of marine Read More
Submitted By:
Mr Alberto Tabaré Lozano Junca

Approved By:
Dr Yamandú Marín (Uruguay)

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The SAGO EXTREME system emerges in 2016 as a new concept to reduce the marine mammal depredation on bottom longline fisheries. Been installed on the Uruguayan FV Ocean Azul equipped with an auto line fishing gear has been proved and developed since 2020 on toothfish fisheries. The SAGO EXTREME system has evolved with a new lunch procedure that eliminates the contact of the Read More
Submitted By:
Mr Alberto Tabaré Lozano Junca

Approved By:
Dr Yamandú Marín (Uruguay)

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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, beginning from the 2023/2024 fishing season (optionally from the 2024/2025 fishing season). The main Read More
Submitted By:
Dr Kostiantyn Demianenko (Ukraine)

Approved By:
Dr Kostiantyn Demianenko (Ukraine)

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Fish bycatch requires accurate information to develop conservation and management strategies. Within the Antarctic krill fishery, larval, juvenile and adult fish are regularly observed as bycatch. Here we describe a research project that addresses key questions in krill fisheries management related to the interactions between early life history stages of fish and the Read More
Submitted By:
Dr Martin Collins (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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Biomass estimates for research blocks in data-limited toothfish fisheries and the resulting recommended catch limits for the 2024 season have been determined using the trend analysis decision rules.

This paper provides a summary of status of current vessel and observer forms and associated manuals, and considers technical advice and updates that may be required to progress future form and manual developments as a result of proposed data collection requirements from the Scientific Committee and its Working Groups.

This paper provides details of the CCAMLR Scheme of International Scientific Observation deployments during the 2023 season (based on data received by the Secretariat up to 9 October 2023). In the 2023 season to date there were 29 longline trips and 19 trawl trips observed. The taxonomic database for species codes was updated, and minor changes were implemented Read More
Submitted By:
Mr Isaac Forster (CCAMLR Secretariat)

Approved By:
Ms Catherine Stubberfield (CCAMLR Secretariat)

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Following the WG-SAM recommendation in 2023 (WG-SAM-2023, paragraph 7.3(i)) to submit a paper describing Agent-Based Models, while focusing on the model presented in WG-SAM-2023/17, this document presents a set of figures designed to illustrate the core components of the model.

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 (Dissostichus mawsoni) recruitment in the Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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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 March/April 2023. 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 Read More
Submitted By:
Mr Dale Maschette (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

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In the Patagonian toothfish (Dissostichus eleginoides) fishery occurred in Kerguelen and Crozet, three species of skates are mainly caught as bycatch. Ageing has proven to be difficult for deep-sea skate species though, this is of dire importance to perform fishery assessment and management. Preliminary studies had indicated that Read More
Submitted By:
Dr Félix Massiot-Granier (France)

Approved By:
Dr Marc Eléaume (France)

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A method  for  age determination of Antarctic toothfish from otoliths based on generally accepted approaches and the proposed process for preparing age samples using modern instruments is presented. Age samples  prepared in this way allow more accurate reading of age rings, improve the possibility of more reliable localization of the sites of otolith nucleus Read More
Submitted By:
Dr Svetlana Kasatkina (Russian Federation)

Approved By:
Dr Svetlana Kasatkina (Russian Federation)

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This paper reports on the update of the Bayesian sex- and age-structured integrated stock assessment model for Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea region (RSR; Subareas 88.1 and Small-Scale Research Units (SSRUs) 88.2A-B) using the most recent available data for the RSR Antarctic toothfish fishery. The assessment model used catch data for 1998–2023, Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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The Casal2 model for Antarctic krill initially reported in Kinzey and Watters (2023) now incorporates MCMC estimation of parameter uncertainty in addition to the MPD estimates described in the earlier paper. Four model configurations are explored employing two different methods of estimating annual recruitment multipliers - simplex transformation and non-simplex - and two Read More
Submitted By:
Dr Doug Kinzey (United States of America)

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

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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 2,000 tonnes in the 2024 and 2025 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 Martin Collins (United Kingdom)

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This paper presents the diagnostics associated with the Casal2 48.3 Patagonian toothfish assessment referred to as the “Final model” in Earl and Readdy, 2023. These diagnostics address the requests from WG-SAM-2023 paragraph 6.33 to include these plots for Casal2 assessments. In addition, approaches are developed for addressing plots indicated in WG-SAM-2023 Read More
Submitted By:
Dr Timothy Earl (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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This paper describes an update of the assessment of Patagonian toothfish (D. eleginoides) in Subarea 48.4. The assessment data are updated with the observations for the 2021 and 2022 seasons. Projections indicate that the stock was at 59.5% of B₀ in 2023 and that a yield of 19 tonnes in 2024 and 2025 is consistent Read More
Submitted By:
Dr Timothy Earl (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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This paper presents the diagnostics associated with the Casal2 model for 48.4 Patagonian toothfish using data up to and including 2022 and is the complementary paper to the assessment paper Readdy and Earl (2023).

We summarise fishing catch and effort in the Ross Sea region (Subarea 88.1 and Small-Scale Research Units 88.2A–B) together with biological characteristics of the catch of Antarctic toothfish (Dissostichus mawsoni) through the 2022/23 fishing season. The implementation of the Ross Sea region Marine Protected Area (RSrMPA) from 1^st December Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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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:
Mr Jeongseok Park (Korea, Republic of)

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The remoteness of the CCAMLR Area causes significant challenges to limit illegal, unreported and unregulated (IUU) fishing. A recent CCAMLR circular submitted by Australia (COMM CIRC 23/61) summarized various pieces of evidence pointing to one vessel strongly suspected of IUU in subarea 58.4.3b in February 2020. Here, we found further evidence of IUU activities over subarea Read More
Submitted By:
Dr Marc Eléaume (France)

Approved By:
Dr Marc Eléaume (France)

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Here, we provide diagnostic plots for the 2023 assessment model for Kerguelen Island EEZ Patagonian toothfish (Dissostichus eleginoides) presented in Massiot-Granier et al. (2023a), following the recommendations of WG-SAM-2023. The stock assessment model is described in Massiot-Granier et al. (2023a), and a detailed description of the stock area, Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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Here, we provide diagnostic plots for the 2023 assessment model for Crozet Islands EEZ Patagonian toothfish (Dissostichus eleginoides) presented in Massiot-Granier et al. (2023a), following the recommendations of WG-SAM-2023. The stock assessment model is described in Massiot-Granier et al. (2023a), and a detailed description of the Read More
Submitted By:
Dr Félix Massiot-Granier (France)

Approved By:
Dr Marc Eléaume (France)

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Here, we provide diagnostic plots for the 2023 assessment model for Kerguelen Island EEZ Patagonian toothfish (Dissostichus eleginoides) presented in Massiot-Granier et al. (2023a), following the recommendations of WG-SAM-2023. The stock assessment model is described in Massiot-Granier et al. (2023a), and a detailed description of the stock area, Read More
Submitted By:
Ms Catherine Stubberfield (CCAMLR Secretariat)

Approved By:
Ms Catherine Stubberfield (CCAMLR Secretariat)

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Investigations into the diet composition and feeding strategies of Dissostichus mawsoni in Subareas 88.1 and 88.3 were conducted based on stomach content analysis of specimens collected during the 2022/23 fishing season. In Subarea 88.1, 249 specimens (ranging from 70 to 190 cm in total length) were examined. D. mawsoni, a Read More
Submitted By:
Dr Sangdeok Chung (Korea, Republic of)

Approved By:
Mr Jeongseok Park (Korea, Republic of)

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This paper presents an updated assessment for Patagonian toothfish (Dissostichus eleginoides) at Heard Island and McDonald Islands in Division 58.5.2. Starting with the 2021 assessment model that was used to provide management advice, this paper presents a bridging analysis, sensitivity analyses, and proposes a new assessment model for 2023.  The 2023 assessment Read More
Submitted By:
Dr Cara Masere (Australia)

Approved By:
Ms Mariana Cordeiro (CCAMLR Secretariat)

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Bottom trawl surveys were carried out by New Zealand on parts of the continental slope of the Ross Sea region in SSRUs 88.1HIK and 88.2A in 2008, 2015, and 2019. Catches from the three surveys contained a mixture of three species: M. whitsoni, M. caml, and Cynomacrurus piriei, and were combined across years and scaled to the slope area to give Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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Recruitment is a key component in population dynamics: its variations can have a major influence on population fluctuations. Recent studies have shown that toothfish recruitment can be highly variable and stock assessments of Patagonian toothfish (PT) have recently shown decreasing trends of estimated recruitment in the recent years. The paper aims at Read More
Submitted By:
Dr Félix Massiot-Granier (France)

Approved By:
Dr Marc Eléaume (France)

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The main aim of this paper is to update WG-FSA on the work of WG-EMM this year on a potential protection mechanism for notothenioid fish nest areas in the Convention Area and for the case of the fish nest area of N. ionah in the southern Weddell Sea. We would like to inform WG-FSA Read More
Submitted By:
Dr Marc Eléaume (France)

Approved By:
Dr Marc Eléaume (France)

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This paper provides a summary of catch and effort in the Antarctic toothfish (Dissostichus mawsoni) and Patagonian toothfish (D. eleginoides) fisheries around the South Sandwich Islands (Subarea 48.4), together with more detailed description of the biological characteristics of the catch of both toothfish species between the 2014 to 2023 Read More
Submitted By:
Dr Timothy Earl (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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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 2021/22 fishing seasons. The analysis and data summary provides the Read More
Submitted By:
Dr Timothy Earl (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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We investigated molecular and morphological traits of 338 individuals of macrourids collected in Subareas 88.1 and 88.3 between 2021 and 2022. Samples were classified into Macrourus caml and Macrourus whitsoni based on the morphological identification keys such as the number of pelvic fin rays (PF) and the row of lower jaw teeth (LJT). Read More
Submitted By:
Dr Sangdeok Chung (Korea, Republic of)

Approved By:
Ms Jung-re Riley Kim (Korea, Republic of)

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In the present paper, we report progress since WG-FSA-2022 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, using spatio-temporal delta generalized linear mixed models (GLMMs) implemented with R package “VAST”. Reflecting the suggestions from WG-FSA-2022, we Read More
Submitted By:
Dr Takehiro Okuda (Japan)

Approved By:
Dr Takehiro Okuda (Japan)

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We present a preliminary analysis of data from the krill fishery and sea ice  in traditional fishing grounds in Subareas 48.1 and 48.2, where the current fishery achieves the bulk of the krill catch over the period 1997-2022.  The complex inter-annual and seasonal dynamics of ice conditions were discussed  in context  of developing management schemes for Read More
Submitted By:
Dr Svetlana Kasatkina (Russian Federation)

Approved By:
Dr Svetlana Kasatkina (Russian Federation)

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In the Patagonian toothfish (Dissostichus eleginoides) fishery occurred in Kerguelen and Crozet, three species of skates are mainly caught as bycatch. Determination of maturity stage of bycatch species by scientific observers is opportunistic resulting in low sample size, especially for females for which dissection is needed. However, length-at-maturity was  Read More
Submitted By:
Dr Félix Massiot-Granier (France)

Approved By:
Dr Marc Eléaume (France)

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Fisheries within the CCAMLR Area are required to operate following CCAMLR Conservation Measures (CM). The current Patagonian toothfish (Dissostichus eleginoides) and Antarctic toothfish (Dissostichus mawsoni) fisheries have been monitored consistently across Subareas 48.2, 48.3 and 48.4 during the last years, producing scientific data for making progress Read More
Submitted By:
Dr César Cárdenas (Chile)

Approved By:
Dr César Cárdenas (Chile)

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

Approved By:
Ms Jung-re Riley Kim (Korea, Republic of)

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The CCAMLR Statistical Subarea 48.3 icefish assessment was conducted by applying the standard projection methodology that has been agreed for this stock by CCAMLR Scientific Committee and its Working Groups. The stratified bootstrap of UK 2023 demersal fish survey icefish catch density and catch rate data indicate a precautionary biomass estimate of 75,170 Read More
Submitted By:
Dr Timothy Earl (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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The local biomass of Antarctic toothfish (Dissostichus mawsoni) in CCAMLR Subarea 48.4 is estimated from tagging returns, giving a five-year average of 1,130 tonnes since 2019. Applying the CCAMLR agreed precautionary assumption of setting harvest rates based on a 5-year average biomass, and harvest rate of γ = 0.038, results in a 2024 catch limit of 43 tonnes Read More
Submitted By:
Dr Timothy Earl (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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Skates (Rajidae) are commonly taken as incidental bycatch in demersal longline fishing operations throughout deep waters of the Kerguelen Plateau. Due to their life history characteristics of slow growth and late maturation, their populations are particularly vulnerable to fishing mortality which can lead to overall and localised population declines. At Heard Island and Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

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Directed fishing on shark species in the Convention Area for purposes other than scientific research is prohibited under Conservation Measure 32-18. This CM further notes that any by-catch of sharks shall, as far as possible, be released alive. Recent trends in shark by-catch in the CAMLR Convention Area are examined here using information reported by vessels (C2) and Read More
Submitted By:
Dr Christopher Jones (United States of America)

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

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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 2022/23 fishing seasons by Japan, Spain, and South Africa. Since the beginning of the structured research plan in 2012/13 fishing season, there have been different year cycles of the plan, the Read More
Submitted By:
Dr Takehiro Okuda (Japan)

Approved By:
Dr Takehiro Okuda (Japan)

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This report presents a summary of the work conducted on board and a preliminary description of the results obtained during the research survey. The cruise started on February 27 and returned to Mar del Plata, Argentina on April 3, 2023.

This work was conducted in the CCAMLR statistical subarea 48.3 and its main Read More
Submitted By:
Mr Javier De Cicco (Argentina)

Approved By:
Dr María Mercedes Santos (Argentina)

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The 2023 South Georgia Groundfish Survey took place over the South Georgia and Shag Rocks shelf on the FV Robin M Lee between the 1st and 10th of February 2023. Seventy-five random trawls were completed covering depths of between 106 and 332 m, including 19 at Shag Rocks, 26 in the north west, 11 in the south west, 8 in the south east and 11 in the north east. Overall biomass Read More
Submitted By:
Dr Phil Hollyman (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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Information on biological aspects of the finfish catches obtained in the survey of BIPO Víctor Angelescu, conducted around South Georgias Islands between March and April 2023, is presented. A total of 14 hauls were performed, with a total of 19 finfish spe Read More
Submitted By:
Mr Javier De Cicco (Argentina)

Approved By:
Dr María Mercedes Santos (Argentina)

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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. Precautionary Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

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In the February 2023 Ukrainian fishing vessel "MORE SODRUZHESTVA" has conducted a local acoustic-trawl survey of Champsocephalus  gunnari in the statistical Subarea 48.2. Report on this survey is presented here.

During March 2023, 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 163 stations. The survey was conducted on the FV Cape Arkona. Sampling protocols such as the design and the duration of the hauls were similar to recent surveys, but with a

new set of randomly Read More
Submitted By:
Mr Dale Maschette (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

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The Scientific Committee identified skates as “priority bycatch taxa for which assessments of status are required”. Catch data from the Ross Sea region show that most (~90%) of the skate catch consists of Antarctic starry skate (Amblyraja georgiana) and that this species is the only one with enough mark-recapture data to estimate local biomass. We present updated Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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The Scientific Committee recommended the adoption of the Ross Sea region Data Collection Protocol (RSDCP) to commence for the 2023/24 to 2027/28 fishing seasons. The proposed changes are limited to (i) a new field that allows noting the additional samples, to be added to the observer biological sample and tag recapture forms and the C2 tag recapture form, and (ii) the Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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To better understand Patagonian toothfish (Dissostichus eleginoides) movement and habitat in the Southwest Atlantic, fifty popup satellite archival tags (PSATs) were deployed off Davis Bank on North Scotia Ridge between 2019 and 2020 on adults ranging from 97-139 cm total length. PSATs (18 Lotek Wireless PSATFLEX and 32 Wildlife Computers MiniPAT) were Read More
Submitted By:
Dr Sangdeok Chung (Korea, Republic of)

Approved By:
Mr Jeongseok Park (Korea, Republic of)

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An approach for understanding the dynamics of krill populations in the Antarctic Peninsula (Subarea 48.1) is through the analysis of empirical data, such as size composition obtained from fishery monitoring. By studying this data over multiple years and considering life history parameters, we can Read More
Submitted By:
Mr Mauricio Mardones (Chile)

Approved By:
Dr César Cárdenas (Chile)

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Work towards the development of a revised management approach for the krill fishery in subarea 48.1 has been conducted within several working groups. The objectives of the revised approach include distributing the catches between several management units to ensure that they do not become too spatially concentrated. Here we examine three elements of Read More
Submitted By:
Dr Martin Collins (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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Stock Annex for:

Species:    Antarctic toothfish (Dissostichus mawsoni)

Area:         Ross Sea (CCAMLR Subareas 88.1 and 88.2A-B)

Created:    24 May 2021

Stock annex describing the method used in the assessment of Patagonian toothfish (Dissostichus eleginoides)  in Subarea 48.3 (South Georgia).

Stock annex describing the method used in the assessment of Patagonian toothfish (Dissostichus eleginoides) in Subarea 48.4 (South Sandwich Islands).

Stock annex describing the method used in the assessment of mackerel icefish (Champsocephalus gunnari) in Subarea 48.3

The aim of this study is to analyse the reproductive potential of icefish species (Champsocephalus gunnari, Pseudochaenichthys georgianus, Chaenocephalus aceratus) and Notothenia rossii off the coast of South Georgias. The research involves assessing length at maturity, total and relative fecundity, and relationships Read More
Submitted By:
Mr Javier De Cicco (Argentina)

Approved By:
Dr María Mercedes Santos (Argentina)

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The toothfish fishery in the Amundsen Sea region operates 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 88.2C-G) shows an improvement in the numbers of recaptures of tagged toothfish within the Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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At the recent SC-CAMLR Workshop on Climate Change (WS-CC-2023), Australia presented a handbook for the adaptation of fisheries management to climate change (‘Adaptation of fisheries management to climate change handbook’ WS-CC- Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

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The need to revise the approach to assessing gear selectivity in relation to the krill fishery in the current CCAMLR topics

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). A total of 10 218 skates have been tagged and released since the 2019/20 fishing season in the Ross Sea, Amundsen Sea, and Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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This paper presents an updated stock assessment for the Patagonian toothfish (Dissostichus eleginoides) fishery of the Crozet Islands, CCAMLR sub-area 58.6, with data up to the end of the season 2021/22 (end of August 2022). This updated assessment model is based on the best available data and includes longline tag-release, Read More
Submitted By:
Dr Félix Massiot-Granier (France)

Approved By:
Dr Marc Eléaume (France)

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This paper presents an updated stock assessment for the Patagonian toothfish (Dissostichus eleginoides) fishery of the Kerguelen Island EEZ, CCAMLR Division 58.5.1. It includes commercial fishery data up to the end of the season 2021/2022. The updated assessment model is based on the best available data and includes abundance estimates from Read More
Submitted By:
Dr Félix Massiot-Granier (France)

Approved By:
Dr Marc Eléaume (France)

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Following the revised krill fishery management strategy recommended by the Scientific Committee and agreed by CCAMLR in 2019, we provide updated precautionary catch limits for Euphausia superba in Divisions 58.4.1 and 58.4.2 East. These catch limits are based on recent biomass estimates from a 2019 Read More
Submitted By:
Mr Dale Maschette (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

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Species identification by fish otoliths is an effective and appropriate approach. However, the allometric growth of otoliths can cause discrimination confusion, particularly in Read More
Submitted By:
Professor Guoping Zhu (China)

Approved By:
Dr Xianyong Zhao (China)

Publication:
ICES Journal of Marine Science, Volume 80, Issue 5, July 2023, Pages 1277–1290, https://doi.org/10.1093/icesjms/fsad052

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Attached is a revised and updated CCAMLR VME Taxa Classification Guide for the Ross Sea region for the toothfish fishery.

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)

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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:
Ms Mariana Cordeiro (CCAMLR Secretariat)

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In 2022, the Scientific Committee tasked the Secretariat with collating and making available fishing net diagrams and net configuration measurements submitted during the fishery notification process on the CCAMLR gear library webpage. Members were also requested to submit papers with additional net diagrams, configurations, and descriptions of operations to Read More
Submitted By:
Ms Claire Van Werven (CCAMLR Secretariat)

Approved By:
Ms Mariana Cordeiro (CCAMLR Secretariat)

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Analysis of fish by-catch in the krill fishery is updated based on recommendations from WG-FSA-2022. In addition to updating the analyses of frequency of occurrence and by-catch rates, by-catch weight is estimated using the observer data. Extensive data quality checks have been performed and enabled the correction of several records.

Reconciliation of the Dissostichus spp. Catch Documentation Scheme (CDS), and monthly fine-scale catch and effort data utilises a relative (10%) and an absolute (200 kg) threshold for differences to identify records for further investigation. WG-FSA-2022 requested the Secretariat to review whether the thresholds are appropriate to identify where reconciliation is needed. A review of all Read More
Submitted By:
Ms Catherine Stubberfield (CCAMLR Secretariat)

Approved By:
Ms Catherine Stubberfield (CCAMLR Secretariat)

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The Vulnerable Marine Ecosystems (VME) registry is currently composed of an excel file available to download by the public at CCAMLR website and additional data stored on CCAMLR databases. The present paper discusses issues of the current registry and presents ongoing improvements to be implemented both for its structure and presentation.

The energy density and fatty acid composition profiles of the muscle and gonad tissues of female mackerel icefish Champsocephalus gunnari from Subarea 48.2 (the South Orkney Islands) were investigated throughout ovarian development to better understand the reproductive allocation strategy and the role of specific fatty acids in the reproductive process. Energy Read More
Submitted By:
Professor Guoping Zhu (China)

Approved By:
Dr Xianyong Zhao (China)

Publication:
Zhu, G.P. and K. Huang. 2023. Fatty acid composition and energy allocation in muscle and gonad tissues indicates that the female mackerel icefish Champsocephalus gunnari is an income breeder. J Fish Biol, 103(3): 460-471, https://doi.org/10.1111/jfb.15461

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This is the third year continuation of the on-going three-year plan from 2021/22 to 2023/24. There is no significant change from the endorsed proposal (WG-FSA-2021/38). South Africa will not be participating in the research fishing in 2023/24 season due to unavailability of the fishing vessel. However, South Africa will participate in the lab and analytical work Read More
Submitted By:
Dr Takehiro Okuda (Japan)

Approved By:
Dr Takehiro Okuda (Japan)

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