WG-FSA-2021

The Secretariat received fishery notifications for exploratory fisheries for toothfish and krill fisheries for 2021/22. No notifications were received for new fisheries. The summary details of all fishery notifications are in this paper, the full details for the consideration of Members of the Commission are available to authenticated users through the CCAMLR website Read More
Presentado por:
Ms Doro Forck (Secretaría de la CCRVMA)

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Es indispensable definir claramente toda unidad de ordenación espacial de las pesquerías de la CCRVMA. A fin de facilitar el desarrollo de un nuevo enfoque de ordenación del kril en la Subárea 48.1, se presentan los límites de las cinco unidades de ordenación propuestas, incluidos los cuatro estratos del Programa de los EE. UU. sobre los Recursos Vivos Marinos Antárticos (US AMLR), que han Read More
Presentado por:
Mr Gangzhou Fan (China)

Aprobado por:
Dr Xianyong Zhao (China)

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Las estimaciones de la biomasa prístina del kril (B₀) son esenciales para generar el límite de captura precautorio (LCP) para una ordenación de la pesquería de kril fundamentada científicamente. En 2019, se realizó una prospección acústica de múltiples Miembros a gran escala para aportar estimaciones de la biomasa del kril del Área 48, al tiempo que se realizaron también Read More
Presentado por:
Dr Xinliang Wang (China)

Aprobado por:
Dr Xianyong Zhao (China)

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In the second decade of February 2021, the Ukrainian longliner CALIPSO performed the research survey with the bottom longline in the northwestern part of the Weddell Sea (statistical subarea 48.1). The work was carried out in accordance with the research plan SC-CAMLR-39/BG/08. Ukraine went on the operations with deep-sea video camera to get the video data which was started on Read More
Presentado por:
Dr Kostiantyn Demianenko (Ucrania)

Aprobado por:
Mr Artem Ogorodnik (Ucrania)

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This paper provides details of SISO observer deployments during the 2020 and 2021 seasons (based on data received by the Secretariat up to 20 August 2021). Developments in the Scheme of International Scientific Observation Programme regarding form updates and historic sampling information are discussed.

Results from the 2020 Conversion Factor Survey of Members’ vessels participating in CCAMLR toothfish fisheries, undertaken by the CCAMLR Secretariat, are presented in this paper. All Members reported that their vessels utilized the headed, gutted and tailed processing method, however no other product type was uniformly produced by Members or vessels. The provision of Conversion Factors by Read More
Presentado por:
Mr Isaac Forster (Secretaría de la CCRVMA)

Aprobado por:
Dr David Agnew (Secretaría de la CCRVMA)

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This paper summarises data collected by Scheme of International Scientific Observation observers and vessels, of incidental interactions between fishing vessels, seabirds and marine mammals during fishing activities undertaken during the 2020 and 2021 seasons. The extrapolated total of 44 seabirds caught in 2020 is the lowest on record for CCAMLR fisheries. Three humpback whales were recorded Read More
Presentado por:
Mr Isaac Forster (Secretaría de la CCRVMA)

Aprobado por:
Dr David Agnew (Secretaría de la CCRVMA)

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Frequency of fish bycatch in vessel and observer data are examined and discussed in this paper, with results from a survey undertaken by the Secretariat on krill bycatch data collection practices by Members presented. Recommendations on standardizing bycatch collection instructions and investigating bycatch data reported by some vessels are detailed.

Biomass estimates for research blocks in data-limited fisheries and the resulting catch limits for the 2022 season have been determined using the trend analysis decision rules. The resulting catch limits are subject to approval by the Commission.

This paper provides a summary of the operation of the fishery forecasting algorithm for the Ross Sea toothfish fisheries for WG-FSA-2021, reviews the forecasting algorithm for fishery closures in the 2019/20 and 2020/21 fishing seasons, and considers alternative scenarios. The secretariat considers that the implementation of the forecasting procedures in place were consistent with the Read More
Presentado por:
Ms Doro Forck (Secretaría de la CCRVMA)

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The Secretariat was requested to generate risk profiles of overrunning catch allocations across a range of vessel capacity (or catch) and fleet sizes to help understand whether reporting requirements for the krill fishery require revision in the future. The fishery capacity and the capacity utilisation were calculated to monitor trends in krill fisheries and daily catches. These data were used Read More
Presentado por:
Mr Henrique Anatole (Secretaría de la CCRVMA)

Aprobado por:
Dr David Agnew (Secretaría de la CCRVMA)

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This document summarises the current state of the database of linked tags held at the CCAMLR Secretariat.

This paper notes updates to current commercial data forms due to the Secretariat’s taxon data project. Also discussed are a Longline Commercial Data Manual for the current C2 form, a proposed new C2 form for introduction in 2023, and a pathway for developing an updated C1 form and an accompanying commercial data manual.

Gear loss as reported by longline vessels from the 2020 and 2021 fishing seasons, including differences in line loss by gear type, is reviewed following recommendations made at WG-FSA-18. Vessels reported 1 363 km of line lost in the Convention Area, of which 22% were complete lines. There was a difference in the relative reporting of lost hooks by gear type, with rates of loss ranging from 2. Read More
Presentado por:
Mr Isaac Forster (Secretaría de la CCRVMA)

Aprobado por:
Dr David Agnew (Secretaría de la CCRVMA)

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The UK undertook a bottom trawl survey of CCAMLR Subarea 48.3 on the FV Robin M Lee from 7^th to 17^th May 2021.  Seventy-seven random trawls were completed covering depths of 105 to 354 m, including 20 at Shag Rocks, 27 in the NW, 14 in the SW, 6 in the SE and 10 in the NE. The biomass of mackerel icefish, Chamsocephalus gunnari, was estimated at 18,013 Read More
Presentado por:
Dr Martin Collins (Reino Unido)

Aprobado por:
Dr Chris Darby

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In 1991, CCAMLR adopted Conservation Measure (CM) 25-03, which prohibits the use of net monitoring cables in the Convention Area and applies to all trawling techniques. The establishment of this CM was a consequence of concerns over seabird mortalities resulting from collisions with net monitoring cables in fisheries. Technology has progressed since the introduction of this CM and the trawlers Read More
Presentado por:
Dr Bjørn Krafft (Noruega)

Aprobado por:
Dr Bjørn Krafft (Noruega)

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CCAMLR Conservation Measure 25-03 prohibits the use of net monitoring cables within the Convention Area. Chinese and Norwegian krill trawlers have been granted an exemption from this CM for the 2019-20 and 2020-21 fishing seasons in order to map interactions between seabirds and the net monitoring cables that are rigged on vessels using the continuous pumping method. These trials will also Read More
Presentado por:
Dr Bjørn Krafft (Noruega)

Aprobado por:
Dr Bjørn Krafft (Noruega)

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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 2021 demersal fish survey icefish catch density and catch rate data indicate a precautionary biomass estimate of 22,047 tonnes (lower one sided 5th Read More
Presentado por:
Dr Timothy Earl (Reino Unido)

Aprobado por:
Dr Chris Darby

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We provide an update on the implementation of the risk assessment in Subarea 48.1 resulting from discussions held during WG-EMM 2021. We have used track changes when adding textual changes incorporated since WG-EMM and all figures have been updated. In this version, we use an updated layer for winter krill density, evaluate some new scenarios and also include some sensitivity analyses.

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Presentado por:
Dr Vicky Warwick-Evans (Reino Unido)

Aprobado por:
Dr Chris Darby

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A summary of the intersessional work and discussion by the Risk Assessment e-group.

Robust stock assessments and catch limits for Dissostichus mawsoni according to CCAMLR decision rules remain to be determined for Divisions 58.4.1 and 58.4.2. Precautionary management arrangements are in place as set out in Conservation Measures 41-11 and 41-05.

WG-FSA-16/29, WG-FSA-18/59, WG-FSA-19/44, and SC-CAMLR-39/BG/10 outlined the multi-member toothfish exploratory Read More
Presentado por:
Dr Philippe Ziegler (Australia)

Aprobado por:
Dr Philippe Ziegler (Australia)

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During late March to mid-April 2021, 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 for the first time on the Cape Arkona. Sampling protocols such as the design and the duration of the hauls were similar to recent surveys, but with a new set Read More
Presentado por:
Dr Philippe Ziegler (Australia)

Aprobado por:
Dr Philippe Ziegler (Australia)

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Recommendations

We recommend the catch limits in Conservation Measure 42-02 be set at 1528 t in the 2021/22 season and 1138 t in the 2022/23 season.

Abstract

The annual random stratified trawl survey was undertaken in Division 58.5.2 in the vicinity of Heard Island and McDonald Islands during April 2021. Based on data from this survey, this paper provides a preliminary Read More
Presentado por:
Dr Philippe Ziegler (Australia)

Aprobado por:
Dr Philippe Ziegler (Australia)

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Recommendations

1. That Model 2 presents best available science for the 2021 Patagonian toothfish stock assessment in Division 58.5.2.
2. That CCAMLR set a catch limit of 3010 tonnes for 2021/22 and 2022/23 in CM 41-08 based on the result of this assessment and the CCAMLR decision rules.

Abstract

This paper presents an updated assessment for the Read More
Presentado por:
Dr Philippe Ziegler (Australia)

Aprobado por:
Dr Philippe Ziegler (Australia)

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This paper presents the results from a three-year longline fishing research survey (2017 - 2019), conducted to improve understanding of Dissostichus spp. population connectivity, biological characteristics and spatial structure across CCAMLR Subareas 48.2 and 48.4. The results provide evidence linking D. mawsoni with the Antarctic continental shelf and indicate a potential Read More
Presentado por:
Dr Timothy Earl (Reino Unido)

Aprobado por:
Dr Chris Darby

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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 (Dissostichus mawsoni) recruitment in the southern Read More
Presentado por:
Mr Nathan Walker (Nueva Zelandia)

Aprobado por:
Mr Nathan Walker (Nueva Zelandia)

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This paper summarises 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) up to and including the 2020–21 fishing season. The implementation of the Ross Sea region Marine Protected Area (RSrMPA) from 1^st Read More
Presentado por:
Mr Nathan Walker (Nueva Zelandia)

Aprobado por:
Mr Nathan Walker (Nueva Zelandia)

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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. However, the seamounts in the north (Small-Scale Research Read More
Presentado por:
Mr Nathan Walker (Nueva Zelandia)

Aprobado por:
Mr Nathan Walker (Nueva Zelandia)

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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 uses catch and effort data for 1998–2021, Read More
Presentado por:
Mr Nathan Walker (Nueva Zelandia)

Aprobado por:
Mr Nathan Walker (Nueva Zelandia)

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Here, we provide diagnostic plots for the 2021 assessment for Ross Sea region Antarctic toothfish (Dissostichus mawsoni) presented in Grüss et al. (2021a), following the recommendations of WG-SAM-2015 (SC-CAMLR-XXXIV 2015 Annex 5). The stock assessment is described in Grüss et al. (2021a), and a detailed description of the stock area, stock assessment methods and the stock assessment Read More
Presentado por:
Mr Nathan Walker (Nueva Zelandia)

Aprobado por:
Mr Nathan Walker (Nueva Zelandia)

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Updated version of the stock annex.

The current management structure in the Amundsen Sea region aims to develop the data required for an integrated stock assessment for toothfish in SSRUs 882C–H. Results are promising for the southern area (SSRUs 882C–G) but yielding inadequate and deteriorating information in the north (SSRU 882H). In SSRU 882H, the current fishery dynamics are likely to generate successively lower catch limits Read More
Presentado por:
Mr Nathan Walker (Nueva Zelandia)

Aprobado por:
Mr Nathan Walker (Nueva Zelandia)

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The medium-term research plan for the Ross Sea toothfish fishery was adopted by the Scientific Committee in 2014. A subsequent data collection plan for fishing vessels and observers was implemented for the 2015/16 to 2019/20 fishing seasons. In 2019/20 and 2020/21, bycatch sampling was extended with a focus on the skate tagging programme. In 2022, the 5-year reports of activities in support of Read More
Presentado por:
Mr Nathan Walker (Nueva Zelandia)

Aprobado por:
Mr Nathan Walker (Nueva Zelandia)

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The Casal2 stock assessment software package is being developed to implement an updated generalised age-structured population model that allows more flexibility in specifying the population dynamics, parameter estimation, and model outputs than CASAL.

The package is approaching a development point where it can be considered for use by CCAMLR for tag-based toothfish assessments. Casal2 Read More
Presentado por:
Mr Nathan Walker (Nueva Zelandia)

Aprobado por:
Mr Nathan Walker (Nueva Zelandia)

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The paper provides a preliminary examination of catches and data holdings for bycatch species in the Ross Sea toothfish fishery. Bycatch species composition varied between management areas; however landings of most species groups were generally highest in SSRUs 88.1H and 88.1I in the S70 management area. As found in other areas of the Convention, macrourids were the most commonly observed Read More
Presentado por:
Mr Nathan Walker (Nueva Zelandia)

Aprobado por:
Mr Nathan Walker (Nueva Zelandia)

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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 8,506 skates tagged and released over the past two seasons in the Ross Sea Read More
Presentado por:
Mr Nathan Walker (Nueva Zelandia)

Aprobado por:
Mr Nathan Walker (Nueva Zelandia)

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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 by continuing to focus on research blocks where tagged fish have previously been released on the slope, while also prospecting Read More
Presentado por:
Dr Sangdeok Chung (República de Corea)

Aprobado por:
Dr Doo Nam Kim

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The diet of Antarctic toothfish, Dissostichus mawsoni, collected from the 88.1 research subarea was analyzed by metabarcoding their stomach contents. As a result of metabarcoding analyzes of 436 stomach contents, which have been collected for three years (2018, 2019, and 2021), a total of 184 haplotypes and 38 species were obtained. As shown in previous studies, the main diet of D Read More
Presentado por:
Dr Sangdeok Chung (República de Corea)

Aprobado por:
Dr Doo Nam Kim

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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, especially relate to diet and feeding strategy which may lead to think about Read More
Presentado por:
Dr Sangdeok Chung (República de Corea)

Aprobado por:
Dr Doo Nam Kim

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This paper examined eggs and larval transport pathways of Antarctic Toothfish under extreme Southern Annual Mode (SAM) events in the continental slope-shelf regions of East Antarctica using a particle tracking model. Ocean currents datasets were calculated using a coupled ocean-sea ice-shelf model output “COCO.” Model simulation results indicated transport pathways of particles released from Read More
Presentado por:
Dr Mao Mori

Aprobado por:
Dr Taro Ichii

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A collaborative research program 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 proposal starting from 2018/19 fishing season in order to contribute to the data acquisition and to speed up the integrated assessments of the Antarctic toothfish (Dissostichus mawsoni) stock in this Read More
Presentado por:
Dr Taro Ichii

Aprobado por:
Dr Taro Ichii

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WG-SAM-2021 and WG-EMM-2021 reviewed available information for krill assessment simulations in Subarea 48.1 using the Grym. Whilst no agreement on parameters was achieved at WG-SAM-2021, the Working Group agreed that an ensemble approach using multiple parameter value combinations could be used (WG-SAM-2021, paras 3.21-3.22.)

WG-EMM-2021 provided initial parameters for the assessment Read More
Presentado por:
Dr Philippe Ziegler (Australia)

Aprobado por:
Dr Philippe Ziegler (Australia)

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The SC-CAMLR last estimated a precautionary harvest rate (gamma) used for management advice in the Area 48 krill fisheries in 2007 (SC-CAMLR, 2007 Annex 4 paras. 2.38-2.39). Subsequently, a range of various methods have been tried, with limited success, to produce both input parameters and stock assessments which can be used for management advice. Following the work plan outlined by SC-CAMLR ( Read More
Presentado por:
Dr Philippe Ziegler (Australia)

Aprobado por:
Dr Philippe Ziegler (Australia)

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Fishing for Patagonian toothfish (Dissostichus eleginoides) has been carried out  in Subarea 48.3  continually for more than 40 years, including more than 25 years under CCAMLR
management.
This paper reviews the long-term decline in the size structure of Patagonian toothfish (Dissostichus eleginoides) observed in longline catches taken in Subarea 48.3. It was noted  that from the Read More
Presentado por:
Dr Svetlana Kasatkina (Federación de Rusia)

Aprobado por:
Dr Svetlana Kasatkina (Federación de Rusia)

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The Scientific Committee considered the assessment of Dissostichus spp. in data-poor fisheries to be of a high priority (SC-CAMLR-XXIX, paragraphs 3.125 to 3.145). The use of different gear types for the implementation of a multi-Member research on Dissostichus spp. in East Antarctica (Divisions 58.4.1 and 58.4.2) in the seasons 2011/12 - 2017/18 is a critical factor for Read More
Presentado por:
Dr Svetlana Kasatkina (Federación de Rusia)

Aprobado por:
Dr Svetlana Kasatkina (Federación de Rusia)

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Reducing fish and invertebrate by-catch in targeted fisheries is an element of a precautionary approach to the management of Antarctic living resources. At the same time establishing by-catch limits sometimes could block in fact the research activities in certain marine areas. It is  a reason to consider establishing by-catch limits for each separate research survey taking into account a Read More
Presentado por:
Dr Kostiantyn Demianenko (Ucrania)

Aprobado por:
Dr Kostiantyn Demianenko (Ucrania)

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During three fishing seasons 2018/19, 2019/20 and 2020/21 Ukrainian vessel CALIPSO (shipowner FC NEPTUNO LLC, Ukraine) tried to perform the research survey in the statistical subarea 48.1 according to the research plans and annual management advices of the working groups FSA and Read More
Presentado por:
Dr Kostiantyn Demianenko (Ucrania)

Aprobado por:
Dr Kostiantyn Demianenko (Ucrania)

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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 2019/2020 (End of August 2020). This updated assessment model is based on the best available data and includes longline tag-release and tag-recapture data from 2007 to 2020 and priors and Read More
Presentado por:
Dr Félix Massiot-Granier (Francia)

Aprobado por:
Dr Marc Eléaume (Francia)

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This paper presents an updated stock assessment for the Patagonian toothfish (Dissostichus eleginoides) fishery of the Kerguelen Islands EEZ, CCAMLR Division 58.5.1. It includes commercial fishery data up to the end of the season 2019/2020 (end of August 2020). The updated assessment model is based on the best available data and includes abundance estimates from random stratified Read More
Presentado por:
Dr Félix Massiot-Granier (Francia)

Aprobado por:
Dr Marc Eléaume (Francia)

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We report the progress on the development of statistical modeling to estimate abundance trends of bycatch species (grenadiers) caught by longline fisheries in CCAMLR Subarea 48.6 using a spatial delta-GLMM implemented by the R package VAST. In response to the comments from WG-FSA-2020 e-group discussions, separate models were constructed for all research blocks within the subarea, and the Read More
Presentado por:
Dr Kota Sawada (Japón)

Aprobado por:
Dr Taro Ichii

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A preliminary integrated stock assessment model was constructed for Dissostichus mawsoni at the Subarea 48.6, using the data collected from Research blocks 2 – 5. Our model showed some improvements, especially in the age/tagging related assumptions. On the other hands, we found some unexpected results on CPUE fits and MPD profiles, which should be carefully considered before we move Read More
Presentado por:
Dr Yumiko Osawa (Japón)

Aprobado por:
Dr Taro Ichii

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This paper represents the final report of a multi-member longline survey on Antarctic toothfish (Dissostichus mawsoni) at Subarea 48.6 between 2018/19 and 2020/21 fishing seasons by Japan, Spain, and South Africa. This survey period is the third of three seasons research at the Subarea 48.6; 1^st: 2012/13-2014/15, 2^nd: 2015/16-2017/18, 3^rd: 2018/19-2020 Read More
Presentado por:
Dr Takehiro Okuda (Japón)

Aprobado por:
Ms Mako Iioka (Japón)

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This paper represents the final report of the multi-member longline survey on Patagonian toothfish (Dissostichus eleginoides) at Division 58.4.4b between 2016/17 and 2020/21 fishing seasons by Japan and France. The C2 and Observer data sets were provided by the CCAMLR Secretariat on July the 12th, 2021. In 2020/21 fishing season, both Japanese and French vessel could not conduct Read More
Presentado por:
Dr Takehiro Okuda (Japón)

Aprobado por:
Dr Taro Ichii

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In order to achieve the milestone “1.5 Update CASAL model” (SC-CAMLR-37 Report, Annex12), the CASAL models for Dissostichus eleginoides at Division 58.4.4b were revised.

We updated CASAL model with data up to 2019/20 fishing season. In this report, the base model (M1 model) is derived from the M4 model of previous report (SC-CAMLR-39/BG/51). We estimated the harvest rate (CAY Read More
Presentado por:
Dr Takehiro Okuda (Japón)

Aprobado por:
Dr Taro Ichii

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The otolith morphology of fish species varies ontogenetically. In this study, 120 otoliths collected from the Ross Sea, the Amundsen Sea, the Weddell Sea, and the Lazarev Sea were used to analyze the morphological differences in otolith of Antarctic toothfish (Dissostichus mawsoni, TOA) across life stages by conventional measurement analysis, elliptical Fourier analysis and Read More
Presentado por:
Professor Guoping Zhu (China)

Aprobado por:
Ms Doro Forck (Secretaría de la CCRVMA)

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Otolith shape analysis has been often widely used for stock discrimination. Controversial results are concluded on geographical stocks between the Crozet Islands and the Kerguelen Islands, East Antarctic. In this study, six otolith shape indices (form factor, roundness, circularity, rectangularity, ellipticity, and aspect ratio) and elliptical Fourier coefficients were used to analyze the Read More
Presentado por:
Professor Guoping Zhu (China)

Aprobado por:
Ms Doro Forck (Secretaría de la CCRVMA)

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The Gradual contraction of Antarctic krill fishery toward islands or concentration in some localized area has caused increased concerns. To examine the potential impact of the concentration of krill fishery, acoustic data and fishery statistics were analyzed to reveal the relationship between the actual fishing sites and the underlying krill distribution; sea ice concentration is also used to Read More
Presentado por:
Dr Xianyong Zhao (China)

Aprobado por:
Ms Doro Forck (Secretaría de la CCRVMA)

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Here, we provide diagnostic plots for the 2021 assessment model for Kerguelen Island EEZ Patagonian toothfish (Dissostichus eleginoides) presented in Massiot-Granier et al. (2021a), following the recommendations of WG-SAM-2015 (SC-CAMLR-XXXIV 2015 Annex 5). The stock assessment model is described in Massiot-Granier et al. (2021a), and a detailed description of the stock area, stock Read More
Presentado por:
Dr Félix Massiot-Granier (Francia)

Aprobado por:
Dr Marc Eléaume (Francia)

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Marine mammal depredation on fisheries is a worldwide issue involving socio-economic and ecological consequences. The bottom longline fisheries directed to toothfish are among them, where Sperm and Killer whales star the depredation events. The SAGO Extreme System is an innovative technology developed to prevent this interaction. Based on the Autoline System and with the addition of the SAGO Read More
Presentado por:
Mr Alberto Tabaré Lozano Junca (Uruguay)

Aprobado por:
Professor Oscar Pin (Uruguay)

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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 2,072 tonnes in the 2022¹  and 2023 seasons would be consistent with the CCAMLR decision rule after accounting for recent mammal depredation rates.

The assessment would lead to Read More
Presentado por:
Dr Timothy Earl (Reino Unido)

Aprobado por:
Dr Chris Darby

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This paper presents the diagnostics associated with the 2021 48.3 Patagonian toothfish assessment.

This paper describes an updated CASAL based assessment of Patagonian toothfish (D. eleginoides) in Subarea 48.4. The assessment data are updated with the observations for the 2019 and 2020 seasons¹. Stock projections indicate that the stock was at 65% of B₀ in 2021 and that a yield of 23 tonnes in 2022 and 2023 is consistent with the application of the CCAMLR Read More
Presentado por:
Dr Timothy Earl (Reino Unido)

Aprobado por:
Dr Chris Darby

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This paper presents the diagnostics associated with the 2021 48.4 Patagonian toothfish assessment.

The biomass of Antarctic toothfish (Dissostichus mawsoni) in CCAMLR Subarea 48.4 is estimated from tagging returns, giving a geometric mean of 1,311 tonnes since 2016. Applying the CCAMLR agreed precautionary assumption of a 5-year geometric mean biomass, and harvest rate of γ = 0.038, implies a 2022 yield of 50 tonnes.

Historically, a precautionary approach has been applied in Read More
Presentado por:
Dr Timothy Earl (Reino Unido)

Aprobado por:
Dr Chris Darby

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The Ross Sea shelf survey has been conducted annually since 2012, with the most recent revised proposal presented in 2017 and spanning five years (2018–2022). This paper:

• serves as notification for the 2022 survey under CM 24-01 following the survey design proposed in WG-SAM-17/39, and annual notifications in WG-FSA-18/41, WG-SAM-19/03, SC-CAMLR-39-BG-03.
• fulfils the Read More
  Presentado por:
  Mr Nathan Walker (Nueva Zelandia)
  
  Aprobado por:
  Ms Doro Forck (Secretaría de la CCRVMA)
  
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Recommendations

(1) That this research plan with a revised sampling design within six existing research blocks in Division 58.4.1 and one existing research block in Division 58.4.2 be adopted.

(2) If directed fishing was not allowed in Division 58.4.1 in 2021/22, that this research plan for the exploratory fishery in Division 58.4.2 with one existing and one new research block be Read More
Presentado por:
Dr Philippe Ziegler (Australia)

Aprobado por:
Dr Philippe Ziegler (Australia)

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