WG-FSA-IMAF-2024

The inclusion of a cross reference to a requirement within CM 41-10 and CM 41-01, Annex B, has inadvertently created inconsistencies with historic cross references between various other conservation measures (CM 41-01, Annex B, CM 41-09 and CM 41-10). A revision to CM 41-01, Annex B and CM 41-10 is suggested to re-align and clarify the respective Read More
Submitted By:
Ms Mariana Cordeiro (CCAMLR Secretariat)

Approved By:
Ms Mariana Cordeiro (CCAMLR Secretariat)

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The Secretariat received fishery notifications for exploratory fisheries for toothfish and krill fisheries for the 2024/25 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-2022, a biennial 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 7.6% of the reconciliations meet the criteria for further evaluation, however, at a season level, the reconciliations had a difference Read More
Submitted By:
Ms Mariana Cordeiro (CCAMLR Secretariat)

Approved By:
Ms Mariana Cordeiro (CCAMLR Secretariat)

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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 2022/23 and 2023/24 seasons and from research fishing under Conservation Measure (CM) 24-05. The CCAMLR fisheries catch limits and associated monthly catches in the 2023/24 season are also presented with dates of fisheries closures implemented by the Read More
Submitted By:
Ms Mariana Cordeiro (CCAMLR Secretariat)

Approved By:
Ms Mariana Cordeiro (CCAMLR Secretariat)

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The Spatial Overlap Analysis (SOA, previously Risk Assessment) forms part of the three-part management approach endorsed by CCAMLR in 2019. The purpose of the SOA includes the spatial and temporal allocation of a catch limit amongst management units and seasons. We have implemented the SOA for the 2024 Harmonisation Symposium’s “preferred option” for spatial management in Read More
Submitted By:
Dr Vicky Warwick-Evans (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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Conservation Measure 25-03 (2023) prohibits the discharge of offal and discards during the shooting and hauling of trawl gear but allows the discharge of 'stick water' (liquid discharge by-product of processing of the catch) understanding that does not constitute a source of food and does not attract seabirds to fishing vessels. In 2023, WG-IMAF Read More
Submitted By:
Dr Marco Favero (Argentina)

Approved By:
Dr María Mercedes Santos (Argentina)

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This document reports the incidental capture of a male humpback whale (Megaptera novaeangliae) by the Chilean fishing vessel Antarctic Endeavour on February 1, 2024, during haul number 133 in CCAMLR Subarea 48.2. The incidental capture was recorded on the vessel C2 form and in the report and logbook prepared by the SISO scientific observer and sent to the CCAMLR Secretariat. Read More
Submitted By:
Dr Lucas Krüger (Chile)

Approved By:
Mr Francisco Santa Cruz (Chile)

Publication:
Unpublished

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This document summarizes the current and ongoing development of the revised approach to the management of the Antarctic krill fishery. The revised approach was adopted by CCAMLR in 2019 and integrates three components, namely regular updates of biomass estimates, a population projection model to estimate precautionary harvest rates, and a krill-predator spatial overlap analysis to determine Read More
Submitted By:
Dr Stéphane Thanassekos (CCAMLR Secretariat)

Approved By:
Dr David Agnew (CCAMLR Secretariat)

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Analysis of fish by-catch in the krill fishery is updated based on recommendations from WG-FSA-2023. In addition to updating the analyses of frequency of occurrence and observer-derived by-catch estimates, a draft extrapolation method is presented.

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 Read More
Submitted By:
Dr Svetlana Kasatkina (Russian Federation)

Approved By:
Dr Svetlana Kasatkina (Russian Federation)

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In this paper, the authors consider the efficiency of observer krill samples in the context of Scientific Observer’s Manual to sample 200 individuals every 3 or 5 days regardless of the number of hauls and the catch values per haul and per day (CM 51-06). The authors have used data obtained on-board Russian vessel Komandor Read More
Submitted By:
Dr Svetlana Kasatkina (Russian Federation)

Approved By:
Dr Svetlana Kasatkina (Russian Federation)

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This paper presents the data on the length and biological composition of krill in areas of the Commonwealth Sea and the Cosmonaut Sea (Subarea 58.4.2) based on Russian scientific observations for the period 1972-1990. 

Using subarea 58.4.2 as an example, the data presented demonstrate Read More
Submitted By:
Dr Svetlana Kasatkina (Russian Federation)

Approved By:
Dr Svetlana Kasatkina (Russian Federation)

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The paper provides updated gear diagrams for Conservation Measure CM 25-02 Annex C to better link with the requirements specified in paragraphs 3 – 4 as requested by the Scientific Committee (SC-CAMLR-42, paragraph 3.49).

This paper summarises data collected by Scheme of International Scientific Observation observers and vessels reporting incidental interactions between fishing vessels, seabirds and marine mammals during fishing activities undertaken during the 2024 season, and presents updated extrapolations of incidents based on a spatial and temporal aggregation of records in addition to per observed Read More
Submitted By:
Mr Isaac Forster (CCAMLR Secretariat)

Approved By:
Dr David Agnew (CCAMLR Secretariat)

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This paper provides details of the CCAMLR Scheme of International Scientific Observation deployments during the 2024 season (based on data received by the Secretariat up to 9 September 2024). In the 2024 season to date there were 31 longline trips and 13 trawl trips observed. For season 2025, changes to observer forms, updated manual and Read More
Submitted By:
Mr Isaac Forster (CCAMLR Secretariat)

Approved By:
Dr David Agnew (CCAMLR Secretariat)

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Biomass estimates for research blocks in data-limited toothfish fisheries and the resulting recommended catch limits for the 2025 season have been determined using the trend analysis decision rules.

To help inform management decisions in the Antarctic krill fishery, we have taken an integrative taxonomic approach to producing a taxonomically and ecologically informative set of identification materials for fisheries observers. We investigated taxonomic uncertainties of fish bycatch reported between 2022 and 2024 as well as making use of the extensive biological archive at Read More
Submitted By:
Dr Martin Collins (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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The outcomes of the Workshop on Climate Change (WS-CC-2023) were reported to the Scientific Committee and all recommendations were endorsed (SC-CAMLR-42). This paper highlights those recommendations directed to WG-FSA. Recalling that climate change is a standing item for consideration for all CCAMLR Working Groups, this paper encourages WG-FSA to progress Read More
Submitted By:
Dr Martin Collins (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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This paper presents initial findings from a research project evaluating climate change risks to toothfish in subareas 48.3 and 48.4. Here we focus on Patagonian toothfish (Dissostichus eleginoides) in Subarea 48.3, using groundfish survey data to develop preliminary distribution models. Data were split into size-classes before analysis Read More
Submitted By:
Dr Martin Collins (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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FAO has requested contributions from CCAMLR on the status of target stocks in the CAMLR Convention Area (FAO Areas 48, 58, and 88) for inclusion in the global State of Stocks Index report, which is updated biennially. We propose a draft status summary for submission, applying FAO criteria and CCAMLR’s management approach and reference points to individual stocks of Read More
Submitted By:
Dr Steve Parker (CCAMLR Secretariat)

Approved By:
Ms Mariana Cordeiro (CCAMLR Secretariat)

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All of the additional data and findings during ongoing research program period exploratory fishery in the Subarea 48.6 (2021/22-2023/24) support the existing stock hypothesis of Antarctic toothfish (Dissostichus mawsoni). Updated data and insights suggest that adult migration is infrequent, and stock structure of Read More
Submitted By:
Dr Takehiro Okuda (Japan)

Approved By:
Dr Takehiro Okuda (Japan)

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The single-sex and age-structured stock assessment model of Antarctic Toothfish (Dissostichus mausoni) at Subarea 48.6 was successfully moved from CASAL to Casal2 software. However, the age data used in our model likely caused issues in the output. This paper presents the result of sensitivity runs with Read More
Submitted By:
Dr Takehiro Okuda (Japan)

Approved By:
Dr Takehiro Okuda (Japan)

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In CCAMLR Subarea 48.6, research longline fishing operations that target Antarctic toothfish (Dissostichus mawsoni) have operated since 2012. Because grenadiers (Macrourus spp.), the main bycatch taxa in this fishery, include multiple species with Read More
Submitted By:
Dr Takehiro Okuda (Japan)

Approved By:
Dr Takehiro Okuda (Japan)

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Pop-up satellite tags (PSATs) have been deployed in D. mawsoni by Japan (since 2017/18 fishing season) and Spain (since 2018/19 fishing season) as a part of research program for exploratory fishery at Subarea 48.6. Table 1 and 2 are metadata of PSAT deployed in Subarea 48.6.  Read More
Submitted By:
Dr Takehiro Okuda (Japan)

Approved By:
Dr Takehiro Okuda (Japan)

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This report updated biological parameters to achieve milestones “1.2. developing ISA models” and ”2.2 Updating Age-Length Key” at Subarea 48.6 (Osawa et al., 2021a). This update includes correction of age estimation of Japanese data using von Bertalanffy growth curve equation derived by Ross Sea female data and Spanish fishery sex-combined data in area 48.6. Age correction Read More
Submitted By:
Dr Takehiro Okuda (Japan)

Approved By:
Dr Takehiro Okuda (Japan)

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WS-ADM2 discussed the importance of ageing works for young toothfish (WG-SAM-2024/14). However, due to the management measures for toothfish exploratory fishery in depths shallower than 550 m, where young fish may be present, opportunities to obtain samples of young fish are less than for adult fish. To address the request from participants of WS-ADM2, the Japanese Read More
Submitted By:
Dr Takehiro Okuda (Japan)

Approved By:
Dr Takehiro Okuda (Japan)

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A collaborative research program for exploratory fishery has been undertaken by Japan and South Africa since 2013 to enhance data collection and analysis in the subarea 48.6 under CM 21-02. Spain joined the research program for exploratory fishery starting from 2018/19 fishing season in order to contribute to the data acquisition and to speed up the Read More
Submitted By:
Dr Takehiro Okuda (Japan)

Approved By:
Dr Takehiro Okuda (Japan)

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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 2023/24 fishing seasons by Japan, Spain, and South Africa. Since the beginning of the structured research plan in 2012/13 fishing season, there have been Read More
Submitted By:
Dr Takehiro Okuda (Japan)

Approved By:
Dr Takehiro Okuda (Japan)

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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. 

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)

Request Meeting Document

The integration of available sources of information is a challenge for any attempt to know dynamics populations

for Antarctic Krill (Euphausia superba) in an integrated stock assessment model. Being able to identify

sources of information, systematize and integrate it in a model and estimate krill population variables in

a context of change and fisheries management is Read More
Submitted By:
Mr Mauricio Mardones (Chile)

Approved By:
Mr Francisco Santa Cruz (Chile)

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Previous retrospective analysis showed that removal of tagging data had a strong influence on the estimation of biomass and recruitment which, potentially, could be a result of changes in the spatial distribution of fishing and tagging effort. This work presents an update of the analysis of description of spatial changes in the Subarea 48.3 toothfish fishery Read More
Submitted By:
Dr Timothy Earl (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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The assessment of the Patagonian toothfish (D. eleginoides) in Subarea 48.3 was updated with an additional year of data, and updates were made to the methodology for standardising CPUE and fitting to the survey. The updated assessment indicates that the current status of the stock is at 49% of B₀ in 2024. 

This paper presents the diagnostics associated with the Casal2 48.3 Patagonian toothfish assessment referred to as the “Final model” in Earl and Readdy, 2024. These diagnostics address the requests from WG-SAM-2023 paragraph 6.33 to include these plots for Casal2 assessments. Age raising diagnostic plots for data collected in 2023 are shown in Appendix Read More
Submitted By:
Dr Timothy Earl (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

Request Meeting Document

The local biomass of Antarctic toothfish (Dissostichus mawsoni) in CCAMLR Subarea 48.4 is estimated from tagging returns, giving a five-year average of 968 tonnes since 2020. 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 2025 catch limit of Read More
Submitted By:
Dr Timothy Earl (United Kingdom)

Approved By:
Dr Martin Collins (United Kingdom)

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We update 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 2024 season. 

The previous assessment model was updated with catch data for Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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The report summarises fishing catch and effort in the Ross Sea region (Subarea 88.1 and Small-Scale Research Units 88.2A–B) with the biological characteristics of the catch of Antarctic toothfish (Dissostichus mawsoni) through the 2023/24 fishing season. The implementation of the Read More
Submitted By:
Dr Jennifer Devine (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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This report provides the diagnostic plots for the 2024 base case model (R2.0) for Ross Sea region Antarctic toothfish (Dissostichus mawsoni) assessment presented in Dunn & Devine (2024).

Attached is a study that estimated the proportion of Patagonian toothfish caught within the New Zealand EEZ that would survive if they were released alive. These survival estimates were based on the available New Zealand and overseas studies, on information from experts, such as fishers, fishery observers, and research scientists, and included use of 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 2024. 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. Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

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The study explores the data collected in Subarea 58.7 and area 51 from the beginning of the fishery in 1996. Biological data for bycatch collected by observers were analysed and parameter related to length-weight relationships were estimated for grenadiers and blue antimora. Length weight relationships of Macrourus carinatus , Read More
Submitted By:
Mr Sobahle Somhlaba (South Africa)

Approved By:
Mr Sobahle Somhlaba (South Africa)

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The Antarctic toothfish, Dissostichus mawsoni, is a large endemic fish species in the Southern Ocean, with a circumpolar distribution. This species is not only an important commercial fish, but also plays a key role in the Southern Ocean ecosystem, especially in the Ross Sea region. This work is a preliminary Read More
Submitted By:
Professor Guoping Zhu (China)

Approved By:
Dr Xianyong Zhao (China)

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Knowing the life history parameters of a species is essential to projecting productivity and effective management of a fished species. Here, we investigate changes in estimates of several life history parameters for mackerel icefish (Champsocephalus gunnari) between 1997-2024 around Heard Island and McDonald Islands in Division 58.5.2. All explored life history Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

Request Meeting Document

To assist CCAMLR Members and their vessel crew and observers in implementing the tagging program, the CCAMLR Secretariat, in consultation with the Scientific Committee and its working groups, have revised and updated the original Toothfish and Skate Tagging Instructions (2013) transforming it Read More
Submitted By:
Mrs Melanie Williamson (South Africa)

Approved By:
Dr Azwianewi Makhado (South Africa)

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Here, we provide diagnostic plots for the 2024 assessment model for Kerguelen Island EEZ Patagonian toothfish (Dissostichus eleginoides) presented in Massiot-Granier et al. (2024a). The stock assessment model is described in Massiot-Granier et al. (2024a), and a detailed description of the stock Read More
Submitted By:
Dr Félix Massiot-Granier (France)

Approved By:
Dr Marc Eléaume (France)

Request Meeting Document

The stocks of Antarctic toothfish, Dissostichus mawsoni were a relatively economically and ecologically important fishery resource in the waters of Antarctic. However, there is not enough data and information to assess the robust stocks and deliberate proper measurements for sustainable utilize, Read More
Submitted By:
Dr Sangdeok Chung (Korea, Republic of)

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

Request Meeting Document

The Antarctic toothfish (Dissostichus mawsoni) is an apex predator in the Southern Ocean ecosystem, and studying its diet can provide important insights into the food web structure of its habitat. This study aimed to investigate geographical differences in the dietary composition of Read More
Submitted By:
Dr Sangdeok Chung (Korea, Republic of)

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

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The incidental mortality (bycatch) of seabirds in longline and trawl fisheries continues to be a serious global concern, especially for threatened albatrosses and petrels, resulting in a Conservation Crisis being declared by the Agreement on the Conservation of Albatrosses and Petrels (ACAP) in 2019. There are currently 31 species listed in Annex 1 of the Read More
Submitted By:
Dr Marco Favero (Argentina)

Approved By:
Dr María Mercedes Santos (Argentina)

Publication:
Document drafted for this meeting

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To attain conservation objectives and conserve the Southern Ocean's biodiversity, a wide range of ecosystems must be safeguarded. Identification of Vulnerable Marine Ecosystems (VMEs) is a critical component of the management framework for bottom fishing activities. Vulnerable Marine Ecosystem within CCAMLR and all Member tates adopt CCAMLR Conservation Read More
Submitted By:
Dr Azwianewi Makhado (South Africa)

Approved By:
Dr Azwianewi Makhado (South Africa)

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Discussions at WG-FSA-2023 flagged the importance of distinguishing changes in outputs from integrated stock assessments from the characteristics of CCAMLR commercial fisheries’ datasets (WG-FSA-2023).  A focus on quantifying changes and correcting for potential biases in fishing and tagging effort was highlighted as one of a number of high priority tasks requiring Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

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On longline vessels under the Ukrainian flag next year, it is planned to conduct photo identification of fishing gear (parts of fishing gear) to confirm that these fishing gear belong to a specific vessel.

Analysis of depth time series data from six Patagonian toothfish (105-126 cm total length) tagged with popup satellite archival tags in the South Atlantic revealed bimodal distributions. These findings suggest that diel swimming behaviors can be used to estimate longitude from transmitted time series data. Our results demonstrate a strong correspondence Read More
Submitted By:
Dr Eunjung Kim (Korea, Republic of)

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

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Based on the three-step sensitivity framework recommended by WG-SAM-2024 (para. 5.10), 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 2023 assessment model that was used to provide management advice, this paper Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

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In 2019 Norway put forward a proposal to reintroduce the use of net monitoring cables (NMCs) on vessels on Norwegian trawl vessels using the continuous fishing method, targeting krill (WG-FSA-16/38). The use of net monitoring cables would allow a more effective monitoring of the fishing gear compared to the battery operated system currently in use and the fishing method Read More
Submitted By:
Mr James Clark (Norway)

Approved By:
Dr Bjørn Krafft (Norway)

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The stock structure of Antarctic toothfish (Dissostichus mawsoni) in Area 88 is being examined to understand stock boundaries for fishery management. It reveals ontogenetic progression in the Ross, Amundsen, and Bellingshausen Seas, with juveniles showing distinct distribution patterns. Korea Read More
Submitted By:
Dr Sangdeok Chung (Korea, Republic of)

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

Request Meeting Document

In 2023 the Scientific Committee endorsed the recommendation from WG-IMAF to consider requiring observers to make species specific estimation of bird abundance around the vessel prior to each warp strike observation, noting that this will impact on the observers’ Read More
Submitted By:
Dr Marco Favero (Argentina)

Approved By:
Dr María Mercedes Santos (Argentina)

Request Meeting Document

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

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

Request Meeting Document

This paper presents an update of the integrated stock assessment for Antarctic toothfish (Dissostichus mawsoni) fishery in CCAMLR Divisions 58.4.1 and 58.4.2, addressing Milestone 1.5 of the current multi-member research plan for these Divisions (WG-SAM-2023/03).

The assessment model used all data available from the region, supplemented with Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

Request Meeting Document

The Chinese krill fishing vessel F/V FU XING HAI conducted her first trial of net monitoring cable seabird-strike mitigation measure during the 2023/24 fishing season in accordance with CM 25-03(2023). A set of mitigation devices were deployed to minimize seabird strike from various cables, including net monitoring cables, trawl warps and additional gear securing ropes/wires Read More
Submitted By:
Dr Xianyong Zhao (China)

Approved By:
Dr Xianyong Zhao (China)

Request Meeting Document

The Chinese krill fishing vessel F/V SHEN LAN conducted consecutively her second trial on net monitoring cable seabird-strike mitigation measure during the 2023/24 fishing season in accordance with CM 25-03 (2023). Two types of fishing systems were used by the vessel during the current fishing season. The continuous trawling system was used from 7 February Read More
Submitted By:
Professor Guoping Zhu (China)

Approved By:
Dr Xianyong Zhao (China)

Request Meeting Document

During March 2024, 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 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 selected haul stations Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

Request Meeting Document

This study examines the implementation and performance of Scientific Electronic Monitoring (SEM) systems on toothfish longline vessels operating in the CCAMLR Convention Area. SEM systems were introduced to enhance data quality and reduce the workload of scientific observers, who face challenges due to harsh conditions and the physical demands of Read More
Submitted By:
Dr Sangdeok Chung (Korea, Republic of)

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

Request Meeting Document

Following a general overview of the fishery in the Kerguelen EEZ and the methodological framework
of mark- recapture models, an exploratory analysis of spatial changes in fishing vessels in this area
revealed the main shifts in the distribution of fishing effort. Although the spatial footprints of different
fishing seasons are generally Read More
Submitted By:
Dr Félix Massiot-Granier (France)

Approved By:
Dr Marc Eléaume (France)

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Antarctic toothfish (Dissostichus mawsoni) were found at depths ranging from 550 to 2000 m throughout Subarea 88.3, with size distributions and catch rates (i.e., abundance) varying by depth and location. Size distributions along the continental slope were typically bimodal, composed of both Read More
Submitted By:
Dr Sangdeok Chung (Korea, Republic of)

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

Request Meeting Document

The stock of Patagonian toothfish (Dissostichus eleginoides) in Subarea 58.5.1 is assessed with the integrated age-structured model Casal2. This model includes many biological parameters, that are potentially influenced by climate change. It is necessary to explore potential temporal trends of these parameters, such as length, age, sex, maturity stage, etc. We investigated the temporal trends Read More
Submitted By:
Ms Fanny Ouzoulias (France)

Approved By:
Dr Marc Eléaume (France)

Request Meeting Document

This document contains supporting information for the Integrated stock assessment for the Heard Island and McDonald Islands Patagonian toothfish (Dissostichus eleginoides) fishery in Division 58.5.2.

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 region toothfish stock assessment. This was the thirteenth survey in the time series and for the first time, the 2024 survey was not Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

Request Meeting Document

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 Read More
Submitted By:
Dr Félix Massiot-Granier (France)

Approved By:
Dr Marc Eléaume (France)

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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)

Request Meeting Document

Within CCAMLR, the Chapman estimator is the agreed mark-recapture model in integrated assessment models used to estimate biomass from toothfish tagging studies.  However, recent discussions in CCAMLR working groups have queried the role that spatial and temporal heterogeneity of fishing and tagging effort might have on mark-recapture estimates.  As recommended Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Philippe Ziegler (Australia)

Request Meeting Document

The 2^nd CCAMLR Ageing Determination Workshop (WS-ADM2) was held at the University of Colorado, Boulder, Colorado, USA from 22 to 26 April 2024. The Workshop was convened by Dr Jennifer Devine (New Zealand), Dr Philip Hollyman (United Kingdom) and Dr Cassandra Brooks (USA), and supported by the CCAMLR Secretariat. Scientists and technical experts from 6 Member Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

Request Meeting Document

An updated Stock Annex based on the 2024 assessment of Ross Sea region Antarctic toothfish (Dissostichus mawsoni) 

The Ross Sea shelf survey has been conducted annually since 2012, with the most recent revised proposal presented in 2023 and spanning three years (2023–2025). This paper:

• serves as notification for the 2025 survey under CM 24-01 following the survey design proposed in WG-SAM-22/01 Rev. 1 and Read More
  Submitted By:
  Mr Nathan Walker (New Zealand)
  
  Approved By:
  Mr Nathan Walker (New Zealand)
  
  Request Meeting Document

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. An uneven distribution of fishing effort on the seamounts in the north of this region (included within Small-Scale Research Unit 88.2H) has had an impact on Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

Request Meeting Document

Research activities within SC-CAMLR and WG-FSA in relation to fish have focused primarily on assessing the stock status of harvested/targeted and bycatch species within the Convention Area. Within CCAMLR’s ecosystem approach to management it is important to incorporate more comprehensive/wider fish-related research to improve our understanding of Southern Ocean ecosystems, including broader Read More
Submitted By:
Dr Christopher Jones (United States of America)

Approved By:
Ms Ona Hahs (United States of America)

Request Meeting Document

TThe Chinese krill fishing vessel F/V SHEN LAN conducted her first trial on net monitoring cable seabird-strike mitigation measure during the 2022/23 fishing season in accordance with CM 25-03 (2022). Two types of fishing systems were used. The continuous trawling system was used only during the initial period of the fishing season before 16 Jan 2023, and Read More
Submitted By:
Dr Yi-Ping Ying (China)

Approved By:
Dr Xianyong Zhao (China)

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The Working Group on Incidental Mortality Associated with Fishing (WG-IMAF) agreed in its 2022 meeting that additional data on sex and total body length for incidental seal mortalities be recorded by CCAMLR Scheme of International Scientific Observation (SISO). The objective is to Read More
Submitted By:
Mr Nathan Walker (New Zealand)

Approved By:
Mr Nathan Walker (New Zealand)

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The author reviewed the issues in relation to the implementation of the multi-vessels research programs in ’data limited toothfish fisheries to which 58.4.1 applies.  

            The Russian side maintains its position that Read More
Submitted By:
Dr Svetlana Kasatkina (Russian Federation)

Approved By:
Dr Svetlana Kasatkina (Russian Federation)

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An analysis of ectoparasite infestations in Champsocephalus gunnari at South Orkney Islands, Antarctica, was performed, which revealed the prevalence, mean abundance, and mean intensity of the two species of parasites collected. The parasites’ preference for parts of the infested host fish was Read More
Submitted By:
Professor Guoping Zhu (China)

Approved By:
Dr Xianyong Zhao (China)

Publication:
Aquatic Ecology, 2023. https://doi.org/10.1007/s10452-023-10072-4

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The Amundsen Sea polynya is one of the richest areas of primary productivity in Antarctica. The Antarctic toothfish (Dissostichus mawsoni, TOA) is a commercially valuable circum-Antarctic fish that undertakes ontogenetic movements on the continental shelf. However, the movement and distribution of this species Read More
Submitted By:
Professor Guoping Zhu (China)

Approved By:
Dr Xianyong Zhao (China)

Publication:
Fisheries Research, 276, 107046. https://doi.org/10.1016/j.fishres.2024.107046

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Otoliths are small calcium carbonate structures found in the inner ear of fish and they, as one of important information carriers, are applied in diverse ecological fields. Otoliths are usually photographed and used to explore many unsolved biological and ecological questions. However, many anomalies may occur in the large volume of otolith image data due Read More
Submitted By:
Professor Guoping Zhu (China)

Approved By:
Dr Xianyong Zhao (China)

Publication:
Zoology, 2023.. DOI: 10.1016/j.zool.2023.126133

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The indices of exploratory toothfish fishery in the Subareas 881 and 88.2   for the period of 2010-2016 are considered. Taking into account the different number of hooks at longlines sets used at the fishery, the catch indices were normalized to 1000 hooks.  The effect of the gear types (autoline, spanish, trotline) on the observed spatial-temporal variability of CPUE toothfish Read More
Submitted By:
Dr Svetlana Kasatkina (Russian Federation)

Approved By:
Dr Svetlana Kasatkina (Russian Federation)

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