WG-FSA-2019

La CCAMLR n'a pas établi de lignes directrices normalisées pour le calcul des coefficients de transformation relatifs aux légines capturées dans les pêcheries nouvelles ou exploratoires de légine. En conséquence, il est probable que les observateurs du SISO, les navires, les armements et les Membres opérant dans ces pêcheries utilisent des méthodologies différentes pour le calcul des Read More
Soumis par:
Matthew Baird (Nouvelle-Zélande)

Approuvé par:
Luke Gaskin (Nouvelle-Zélande)

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Le présent document résume les informations détenues par le secrétariat sur les activités de pêche et des navires INN en rapport avec la CCAMLR d'octobre 2018 à août 2019. Le tableau 1 recense les cas d'engins de pêche non identifiés récupérés dans la zone de la Convention. Le tableau 2 fournit des détails sur les Parties non contractantes destinataires et les réponses reçues. Il est proposé d Read More
Soumis par:
Doro Forck (Secrétariat de la CCAMLR)

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The Secretariat received fishery notifications for exploratory fisheries for toothfish and krill fisheries for 2019/20. 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
Soumis par:
Doro Forck (Secrétariat de la CCAMLR)

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The reconciliation of CDS data with monthly fine-scale catch and effort data has demonstrated the effectiveness of the CDS to trace the catch of toothfish caught in the CCAMLR Convention Area. Whilst some variability has been observed amongst vessels, members have been contacted and dialogue is ongoing.

This document provides summary advice to the Commission on the Secretariat’s interpretation and application of procedures to monitor and forecast closures in CCAMLR fisheries in the 2018/19 season. Key issues in applying the procedures, and specific instances which resulted in catch over-runs and under-runs in certain circumstances are examined.

In response to a request from the Commission and Scientific Committee, the Secretariat worked intersessionally and communicated with Members to develop draft technical guidelines to assist vessels which encounter unidentified fishing gear in the Convention Area. The work is summarised, and the draft guidelines, which were published to the CCAMLR e-group in 2019.

Le présent document résume une évaluation du programme de la CCAMLR de suivi des débris marins et envisage des moyens pour le moderniser. Il recommande au Comité scientifique de former un groupe de correspondance de la période d'intersession sur les débris marins pour examiner et réviser le programme, y compris pour définir ses objectifs, préparer du matériel du programme, et élaborer une Read More
Soumis par:
Emily Grilly

Approuvé par:
David Agnew (Secrétariat de la CCAMLR)

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Bien que l'AMP de la région de la mer de Ross (AMPRMR) existe depuis trois ans, il n'est pas clair comment les limites de capture pour la pêche de recherche dans l'AMP devraient être allouées. Les dernières recommandations du Comité scientifique concernant le prélèvement des captures admissibles pour les campagnes d'évaluation dans les AMP sur le TAC fixé pour la pêcherie exploratoire Read More
Soumis par:
Svetlana Kasatkina (Fédération de Russie)

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Svetlana Kasatkina (Fédération de Russie)

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Le Comité scientifique a reconnu que pour conserver son avance dans le domaine de gestion écosystémique des pêches, ses groupes de travail devaient tenir compte des implications du changement climatique.

La robustesse du protocole de gestion de la légine mis en place par la CCAMLR, basé sur la règle de décision, est évaluée en considérant les futurs changements hypothétiques des Read More
Soumis par:
Chris Darby

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Chris Darby

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This paper presents catches of target species from directed fishing on toothfish, icefish and krill in the Convention Area in 2017/18 and 2018/19, and catches taken during research activities pursuant to CM 24-01, paragraph 3. Monthly catch totals for 2018/19, based on data reported to 13 September 2019, are presented with dates of closures of fisheries implemented by the Secretariat.

The annual random stratified trawl survey was undertaken in Division 58.5.2 in the vicinity of Heard Island and McDonald Islands during April 2019. 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 to the west of 79^o 20’ E using standard Read More
Soumis par:
Dale Maschette (Australia)

Approuvé par:
Dirk Welsford (Australia)

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During late March to early April 2019, 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 150 stations. The survey was conducted on the FV Atlas Cove. Sampling protocols such as the design and the duration of the hauls were similar to recent surveys, but with a new set of Read More
Soumis par:
Philippe Ziegler (Australia)

Approuvé par:
Dirk Welsford (Australia)

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At SAM 2019, there were again reports on damage and/or loss of longline gear, most likely due to impact by sea ice. Especially when operating in areas with difficult sea ice conditions and quickly varying sea ice cover, there is an increased risk that any parts of longline gear floating on the surface might get caught up and ensnarled by drifting sea ice flows or sea ice pressure ridges. This Read More
Soumis par:
Stefan Hain (Allemagne)

Approuvé par:
Thomas Brey

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We examined movements of tagged Antarctic toothfish (Dissostichus mawsoni) for subarea 48.6 in relation to life history hypotheses. Most of long-distance movements occurred in westward direction along continental shelf, which may be consistent with the single Atlantic population hypothesis (Söffker et al., 2018). Meanwhile, no migrations of tagged fish between northern seamounts ( Read More
Soumis par:
Taro Ichii

Approuvé par:
Taro Ichii

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This paper presents an update of the metrics of capacity and capacity utilisation presented in WG-SAM 14/19 and WG-FSA 15/09 in order to monitor trends in capacity in exploratory toothfish fisheries in Subareas 88.1 and 88.2.   The updated metrics show the same pattern as in previous updates and do not indicate an excess of capacity in the fishery.  Interpretation of data for Read More
Soumis par:
Doro Forck (Secrétariat de la CCAMLR)

Approuvé par:
David Agnew (Secrétariat de la CCAMLR)

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This report summarises fishing catch and effort in the Ross Sea region (Subarea 88.1 and SSRUs 88.2AB) together with biological characteristics of the catch of Antarctic toothfish through the 2019 season. The implementation of the Ross Sea Region Marine Protected area in December of 2017, concentrated fishing on the slope south of 70° S on the traditional fishing grounds, with some expansion Read More
Soumis par:
Nathan Walker (Nouvelle-Zélande)

Approuvé par:
Nathan Walker (Nouvelle-Zélande)

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A Bayesian sex- and age-structured integrated stock assessment for Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea region (Subareas 88.1 and SSRUs 88.2A-B) is updated and revised using the most recent available data for the fishery. The assessment uses reported catch (C2), and tag-recapture data for 1998–2019 and age and abundance data from the Ross Sea Shelf survey for Read More
Soumis par:
Nathan Walker (Nouvelle-Zélande)

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Nathan Walker (Nouvelle-Zélande)

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Stock Annex for the stock assessment of Ross Sea region Antarctic toothfish (Dissostichus mawsoni)

Species:    Antarctic toothfish (Dissostichus mawsoni)

Area:        Ross Sea (CCAMLR Subareas 881 & 882A-B)

Created:    1 October 2019

Authors:   Alistair Dunn and Steve Read More
Soumis par:
Nathan Walker (Nouvelle-Zélande)

Approuvé par:
Nathan Walker (Nouvelle-Zélande)

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We provide diagnostic plots for the 2019 base case model for Antarctic toothfish in the Ross Sea region presented in Dunn (2019a), following the recommendations of WG-SAM-2015 (SC-CAMLR-XXXIV 2015 Annex 5). The stock assessment is described in Dunn (2019a) and a detailed description of the stock area, stock assessment methods and the stock assessment parameters are given in Dunn & Parker ( Read More
Soumis par:
Nathan Walker (Nouvelle-Zélande)

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Nathan Walker (Nouvelle-Zélande)

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We update the estimates of the growth and length-weight parameters for Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea region (Subareas 88.1 and SSRUs 88.2AB). We present revised estimates of the von Bertalanffy growth curves, estimates of mean length at age using maximum likelihood estimation (MLE), and the length-weight relationship based on available CCAMLR SISO data Read More
Soumis par:
Nathan Walker (Nouvelle-Zélande)

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Nathan Walker (Nouvelle-Zélande)

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The Amundsen Sea region toothfish fishery has been operating since 2003. The biological characterisation of the fishery showed a truncation of the right-hand limb of the age distribution between 2004 and 2014. Few age data are currently available after 2014. We recommend that further ageing of toothfish in the ASR be made a priority to develop annual age-length keys and age frequencies. We Read More
Soumis par:
Nathan Walker (Nouvelle-Zélande)

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Nathan Walker (Nouvelle-Zélande)

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Electronic Monitoring on fishing vessels is increasing globally and is seen as an efficient method of assisting reliable reporting in commercial fisheries. These systems have been traditionally focused on the need to independently meet regulatory and market demands for transparency and accountability, but an increasingly important consideration is the contribution such systems can make to Read More
Soumis par:
Nathan Walker (Nouvelle-Zélande)

Approuvé par:
Nathan Walker (Nouvelle-Zélande)

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CCAMLR hosts a list of taxa based on the  Aquatic Sciences and Fisheries Information System (ASFIS) List of Species for Fishery Statistics Purposes published by the FAO.The species names used in CCAMLR need to be up to date with current classification and phylogenies. The World Register of Marine Species (WoRMS - www.marinespecies.org) is managed Read More
Soumis par:
Keith Reid

Approuvé par:
David Agnew (Secrétariat de la CCAMLR)

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This paper provides details of SISO observer deployments during the 2019 season (based on data received by the Secretariat up to 18 September 2019). Developments in the Scheme of International Scientific Observation Programme are discussed, and results presented from the vessel tagging pro-forma survey conducted on vessels participating in exploratory fisheries.

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 2019 season. A short report is also detailed on a large seal morality event which occurred at the end of the 2018 season. Incidental mortality numbers for Read More
Soumis par:
Isaac Forster (Secrétariat de la CCAMLR)

Approuvé par:
David Agnew (Secrétariat de la CCAMLR)

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This document is based on the Research proposal for Dissostichus spp. in Subarea 48.1 by the Ukraine (WG-SAM-2019/28), which was presented and discussed at the meeting of the Working Group on Statistics on Statistics, Assessments and Modelling (Concarneau, France, 17 to 21 June 2019).

Gear loss as reported by longline vessels from the 2018 and 2019 fishing seasons, including differences in line loss by gear type, is reviewed following recommendations made at WG-FSA-18. Vessels reported 1 632 km of line lost in the Convention Area, of which 27% were complete lines. There was no difference in the relative reporting of lost hooks by gear type, with rates of loss recorded at 0. Read More
Soumis par:
Emily Grilly

Approuvé par:
David Agnew (Secrétariat de la CCAMLR)

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Reliable species identification and population assessments of skates are crucial for the sustainable management of their vulnerable stocks. However, species identification is a major challenge in skate studies due to convergent morphology within and between genera. In this study, we applied molecular tools to identify specimens of softnose skates (Bathyraja spp.) caught as bycatch Read More
Soumis par:
Phil Hollyman (Royaume-Uni)

Approuvé par:
Chris Darby

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The UK undertook a bottom trawl survey of CCAMLR sub-Area 48.3 on the FV Sil between the 27thth January and 5th February 2019. A total of 73 random and representative hauls were completed covering depths of between 108 and 352m. Overall biomass of mackerel icefish, Chamsocephalus gunnari, was calculated at 50,897 tonnes with a lower 1-sided 95% interval estimate of 30,288 tonnes. This Read More
Soumis par:
Phil Hollyman (Royaume-Uni)

Approuvé par:
Chris Darby

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A preliminary integrated stock assessment model was constructed for Dissostichus mawsoni at the research block 48.6_2, as a test run for integrated assessment model for stock assessment of D. mawsoni at Subarea 48.6. Our preliminary analysis is problematic as a stock assessment, but indicates future tasks for improvement: further sensitivity analysis of IUU, addition of Read More
Soumis par:
Kota Sawada (Japon)

Approuvé par:
Taro Ichii

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This paper represents the annual report of a multi-member longline survey on Antarctic toothfish (Dissostichus mawsoni) at Subarea 48.6 in the 2018/19 fishing season by Japan, Spain, and South Africa. The data set, C2 and Observer data, was provided by the CCAMLR Secretariat on the 7th August, 2019. In this paper, the data set during current fishing season (2018/19) was used for Read More
Soumis par:
Takehiro Okuda (Japon)

Approuvé par:
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. From the last season (2018/19) Spain has joined the proposal in order to contribute to the data acquisition and to speed up the integrated assessments of the Antarctic toothfish (Dissostichus mawsoni) stock in this subarea (FSA-18/34 Read More
Soumis par:
Doro Forck (Secrétariat de la CCAMLR)

Approuvé par:
Taro Ichii

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In order to investigate and monitor the ecological impact of longlines on the benthic environment and subsequently develop strategies for its management, the UK is conducting a series of research projects studying the potential impact of longline fishing gear on benthic habitats. The research has been structured around three approaches, each deploying a different format of benthic camera Read More
Soumis par:
Georgia Robson (Royaume-Uni)

Approuvé par:
Chris Darby

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Biomarker analysis, especially fatty acids (FA) and stable isotopes (SI), has become a useful tool to elucidate the flow of energy and trophic interactions in an ecosystem and to analyse the diet of species that are hard to observe while feeding. Herein we compare FA profiles and SI composition (nitrogen, δ¹⁵N and carbon, δ¹³C) of muscle tissue from two sympatric Read More
Soumis par:
Esteban Barrera-Oro (Argentina)

Approuvé par:
Enrique Marschoff (Argentina)

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The biomass of Antarctic toothfish (D. mawsoni) in CCAMLR subarea 48.4 is estimated from tagging returns to average 1109 tonnes since 2010, with a five-year (2015-2019) average biomass of 1187 tonnes. Applying the CCAMLR agreed precautionary assumption of average biomass across the time series and harvest rate of γ = 0.038, implies a 2019/20 yield of 45 tonnes using the 5-year average Read More
Soumis par:
Georgia Robson (Royaume-Uni)

Approuvé par:
Chris Darby

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Assessment of the Patagonian toothfish (D. eleginoides) in Subarea 48.3 indicates that the current status of the stock is at 50% of B₀. Spawning biomass has been relatively constant in recent years. Projections indicate that a constant catch of 2,420 tonnes in the 2020  and 2021 seasons would be consistent with the CCAMLR decision rule.

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 2017/18 season and the data weighting method revised to be consistent with those applied in other CCAMLR assessment model fits. Stock projections indicate that the stock was at 67% of B₀ in 2018/19 and Read More
Soumis par:
Georgia Robson (Royaume-Uni)

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Chris Darby

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A stratified bootstrap of icefish catch density based on the UK 2019 demersal fish survey catch rate data indicated a biomass of 53,124 tonnes (lower one sided 5th percentile: 32,399 tonnes) within Statistical Subarea 48.3. Projections for the 2019/20 and 2020/21 seasons applying the CCAMLR harvest control rule lead to catch limits (TAC) of 3,225 tonnes for 2019/20 and 2,132 tonnes for 2020/21 Read More
Soumis par:
Georgia Robson (Royaume-Uni)

Approuvé par:
Chris Darby

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Minimising seabird interactions with longline operations is a key objective of the management of fisheries in CCAMLR (see e.g. Conservation Measure CM 25-02 and 41-08). Longline fishing in the fishery for Patagonian toothfish (Dissostichus eleginoides) in Statistical Division 58.5.2 started as a winter fishery (1 May - 14 September) to minimise seabird interactions, and has employed a Read More
Soumis par:
Philippe Ziegler (Australia)

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Dirk Welsford (Australia)

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This paper presents an updated assessment for the Patagonian toothfish (Dissostichus eleginoides) fishery at Heard Island and McDonald Islands (HIMI) in CCAMLR Division 58.5.2 with catch until the end of 2019 and observations until the end of 2018. The updated assessment model is based on the best available estimates of model parameters, the use of abundance estimates from a random Read More
Soumis par:
Philippe Ziegler (Australia)

Approuvé par:
Dirk Welsford (Australia)

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Fisheries are human activities that alter resource availability for species in marine ecosystems. While fisheries remove fish biomass, they may also provide new feeding opportunities to various marine predators. These species, depredating on catches directly on the fishing gear, has emerged as major human-wildlife conflict with socio-economic and ecological impacts globally. This study Read More
Soumis par:
Dirk Welsford (Australia)

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Dirk Welsford (Australia)

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1. Climate change, fisheries and invasive species represent three pervasive threats to seabirds, globally. Understanding the relative influence and compounding nature of marine and terrestrial threats on the demography of seabird communities is vital for evidence-based conservation.

2. Using 20 years of capture-mark-recapture data from four sympatric species of albatross Read More
   Soumis par:
   Dirk Welsford (Australia)
   
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   Dirk Welsford (Australia)
   
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The Antarctic toothfish, Dissostichus mawsoni, serves as valuable fishery resources around the Antarctic Continent since 1997, managed solely by the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR). Although defining genetic or stock structure of populations is crucial for improving fishery management of this species, the number of populations or stocks of Read More
Soumis par:
Sangdeok Chung (Corée, Rép. de)

Approuvé par:
Seok-Gwan Choi (Corée, Rép. de)

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Antarctic toothfish, Dissostichus mawsoni is the ecologically important Nototheniidae, which is native to the Southern Ocean. Although it plays an important role in the Antarctic ecosystem, the ecology of D. mawsoni is still fragmental mainly due to the limited accessibility for the sample collection. Diet study provides the basic information of feeding relationship among the Read More
Soumis par:
Sangdeok Chung (Corée, Rép. de)

Approuvé par:
Seok-Gwan Choi (Corée, Rép. de)

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This document summarizes oceanological data for the season 2018-2019 from Ukrainian longline fishery ships, worked in the CCAMLR area. Information about vertical distribution of temperature, bottom temperature variability, spatial temperature changes, inter-annual temperature variability, water masses and relationship of temperature with catches of toothfish in Weddell, Ross and Amundsen Seas Read More
Soumis par:
Leonid Pshenichnov (Ukraine)

Approuvé par:
Kostiantyn Demianenko (Ukraine)

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During Austral summer 2018-19, four Ukrainian longliners continued the opportunistic collection of the mesozooplankton in the Pacific and Atlantic sectors of the Southern Ocean. Zooplankton were collected onboard four Ukrainian longliners: CALIPSO, KOREIZ, MARIGOLDS and SIMEIZ

Fishing for Patagonian toothfish (Dissostichus eleginoides) has been carried out around South Georgia 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 the South Georgia Area (FAO Area 48.3). We Read More
Soumis par:
Svetlana Kasatkina (Fédération de Russie)

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Svetlana Kasatkina (Fédération de Russie)

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Russian research of craboids (Anomura, Decapoda) in the Antarctic Pacific (Subareas 88.2 and 88.3) were carried out by the  vessel “Antarctic Wolf” in March 2019 in full compliance with the Russian program (WGSAM-18/06; WGFSA-18/32 Rev.1) and recommendations of the Scientific Committee (SC-CAMLR –XXXVII, paragraph 4.3 (i-viii)). Pot catches was presented by craboid Paralomis birstaini Read More
Soumis par:
Svetlana Kasatkina (Fédération de Russie)

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Svetlana Kasatkina (Fédération de Russie)

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Russian Federation is going to continue investigation for toothfish in Ross Sea. This paper presents the   research program in the frame of the Research and Monitoring Plan for RSRMOR. 

The research program shall be conducted in the Special Research Zone during 2019 - 2021 or the first reference period for existence of the RSRMPA. This program provides possibility for Read More
Soumis par:
Svetlana Kasatkina (Fédération de Russie)

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Svetlana Kasatkina (Fédération de Russie)

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Exploratory fishing for toothfish (Dissostichus mawsoni) in East Antarctica (Divisions 58.4.1 and 58.4.2) began in 2003. Robust stock assessments and catch limits according to CCAMLR decision rules remain to be determined for these Divisions. WG-FSA-16/29 outlined the first multi-member toothfish exploratory fishery research plan up to 2017/18 for East Antarctica, which the Read More
Soumis par:
Philippe Ziegler (Australia)

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Dirk Welsford (Australia)

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A descriptive analysis of the Patagonian toothfish (Dissostichus eleginoides) population using data collected from observers onboard  two Spanish fishing vessels, obtained between 2017 and May 2019, in international waters of the South Indian Ocean within the FAO areas 51.7 and 57.4 managed by SIOFA, adjacent to the Commission for the Conservation of Antarctic Marine Resources ( Read More
Soumis par:
Roberto Sarralde Vizuete (Espagne)

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Roberto Sarralde Vizuete (Espagne)

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CCAMLR has defined Vulnerable Marine Ecosystems (VME) detection thresholds based on the benthos bycatch monitoring. When these thresholds are reached during a single longline fishing operation, the data are reported to the Secretariat to inform the CCAMLR about the potential presence of VME to be protected. Management decisions are triggered out according to various levels. Important catches Read More
Soumis par:
Alexis Martin (France)

Approuvé par:
Marc Eléaume (France)

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Spanish and Australian scientists are working on the age and growth estimates of Antarctic toothfish within divisions 58.4.1 and 58.4.2 from 2015 and 2017 respectively. During 2019, Korean scientists have joined this colaborative work.

Age-length frequencies from the three members are shown and "a posteriori" calibration between ESP and KOR has been made.

Since the correlation of SST between Subarea 48.6 and Division 58.4.2 was reported in Namba et al. (WG-SAM-17/10), correlations of SIC between Subareas 48.6 and 88.1 (Ross Sea), Weddell Sea and the Sea offPeru were re-analyzed in this paper. There is some correlation of SIC between Subareas 48.6 and 88.1 with SST data from 2002-2019. In addition, the correlation of SST and SST shifted forward 6 Read More
Soumis par:
Roberto Sarralde Vizuete (Espagne)

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Roberto Sarralde Vizuete (Espagne)

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It  was  reported  at  WG-SAM-2019  that  the  sea  ice  concentration  (SIC) of RB 48.6-5 corresponded well with the dynamics of monthly sea surface temperature  (SST)  anomaly  in  RB  48.6-5.   However,  in  the  prediction  of SIC  in  RB  48.6-5  using  the Read More
Soumis par:
Roberto Sarralde Vizuete (Espagne)

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Roberto Sarralde Vizuete (Espagne)

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Photo-identification is a technique that uses photographs of animals to identify individuals through natural markings visible on their body and is central for research on cetaceans. Best gear configuration to conduct photo-identification consists in a SLR camera equipped with a 100-400 mm lens. This paper addresses concerns regarding the complexity and the price of the SLR gear by presenting Read More
Soumis par:
Nicolas Gasco (France)

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Marc Eléaume (France)

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The five years of survey and observations of Dissostichus spp. in statistical subarea 48.2 on board the Ukrainian vessel SIMEIZ. Survey was conducted in accordance with the recommendations of the Scientific Committee and Commission. Data on the distribution of Antarctic toothfish and by-catch fish, biological characteristics of Antarctic and Patagonian toothfish are Read More
Soumis par:
Leonid Pshenichnov (Ukraine)

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Kostiantyn Demianenko (Ukraine)

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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) carried out in the seasons 2011/12 - 2017/18 Read More
Soumis par:
Svetlana Kasatkina (Fédération de Russie)

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Svetlana Kasatkina (Fédération de Russie)

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We report on objective 3 “Investigate population structure of bycatch species and inform bycatch mitigation measures” of the ongoing research plan on Patagonian toothfish (Dissostichus eleginoides) conducted by Japan and France in Division 58.4.4b (WG-SAM-2019/08). We analyzed bycatch composition in number and biomass during the period 2008-2018 to investigate the inter-annual Read More
Soumis par:
Clara Péron (France)

Approuvé par:
Marc Eléaume (France)

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Killer whale and sperm whale depredation interactions with longlines targeting Patagonian toothfish (Dissostichus eleginoides) have been documented as a severe issue in the Crozet EEZ since the late 90’s. Estimating depredation rates allows to correct catches and therefore to model the real impact of fishing activities on Patagonian toothfish stocks. Photo-identification of Read More
Soumis par:
Nicolas Gasco (France)

Approuvé par:
Marc Eléaume (France)

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At WG-SAM-2019, it was highlighted that some of the language in the table used to assess research plans in data-poor fisheries was ambiguous, in particular to delegates that do not have English as their first language. In this paper, we propose some revisions to the table to attempt to reduce this ambiguity. 

We report on objective 2 “inform estimations of the distribution, relative abundance, and life history of the main bycatch species” of the suspended research plan on Patagonian toothfish (Dissostichus eleginoides) last submitted in 2018 by Japan and France in Division 58.4.3a (WG-FSA-18/61). We analyzed bycatch composition in number and biomass during the period 2008-2018 to Read More
Soumis par:
Clara Péron (France)

Approuvé par:
Marc Eléaume (France)

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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 2018/2019 (End of August 2019). This updated assessment model is based on the best available data and includes longline tag-release and tag-recapture data from 2007 to 2019 and priors and Read More
Soumis par:
Félix Massiot-Granier (France)

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Marc Eléaume (France)

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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 2018/2019 (end of August 2019). The updated assessment model is based on the best available data and includes abundance estimates from random stratified Read More
Soumis par:
Félix Massiot-Granier (France)

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Marc Eléaume (France)

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Fourier shape analysis was used to study the morphology of sagittal otoliths of 383 Dissostichus mawsoni from 3 Subareas using two statistical methods. Stepwise discriminant analysis showed a classification accuracy of 73.19%. Principal component analysis revealed the accumulated contribution rate of 29 principal components was 72.45%. These findings demonstrate that Fourier analysis Read More
Soumis par:
Guoping Zhu (Chine)

Approuvé par:
Xianyong Zhao (Chine)

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An observation on the interaction between marine mammal and krill midwater trawl was carried out onboard the Chinese krill fishing vessel Fu Rong Hai during the 2018/19 fishing season. The inner-trawl observation was made using an Underwater IP Camera, while sea surface observation was conducted visually with the aid of a SLR Camera and a Marine Binocular. Sea surface observation in Read More
Soumis par:
Yi-Ping Ying (Chine)

Approuvé par:
Xianyong Zhao (Chine)

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Otolith chemical analysis is one of important and useful approaches to reveal the stock structure and connectivity of Dissostichus mawsoni in the Southern Ocean. Recalling the suggestion from WG-FSA 2018 about the international collaboration on otolith microchemistry of D. mawsoi, this progress report summarized the update of this work. The result indicated that the Read More
Soumis par:
Guoping Zhu (Chine)

Approuvé par:
Xianyong Zhao (Chine)

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In order to achieve the milestone “1.5 Update CASAL model” of the ongoing research plan submitted by Japan and France (WG-SAM19/08), the CASAL models for Dissostichus eleginoides at Division 58.4.4b were revised.

Following WG-SAM-2019 suggestions (para 6.76 in the WG-SAM2019 report), we conducted an exploration of the impact of Age Length Keys (ALK), CPUE standardization, and Read More
Soumis par:
Takehiro Okuda (Japon)

Approuvé par:
Doro Forck (Secrétariat de la CCAMLR)

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Using two different surface geostrophic filed data (A-1: without and A-2: with temporal eddy activity) covering 2011-2018, we developed the particle tracking model to investigate egg and larval transport of the Antarctic Toothfish in the East Antarctic region. This paper presents the transport pattern of particles released from plausible spawning grounds, i.e. Banzare Bank (BB: Kerguelen South Read More
Soumis par:
Mao Mori

Approuvé par:
Doro Forck (Secrétariat de la CCAMLR)

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Division 58.4.4b has been a closed area since 2002 (CM 32-02) and scientific research has been conducted with a research plan submitted under CM 24-01 since 2008 by Japan. France joined this research plan in 2015 and a joint proposal was submitted for the first time in 2016 (WG-SAM-16/06 and WG-FSA-16/33 Rev. 1) for a period of 5 years.

The proposal submitted here has been substantially Read More
Soumis par:
Takehiro Okuda (Japon)

Approuvé par:
Taro Ichii

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This paper represents the annual report of the multi-member longline survey on Patagonian toothfish (Dissostichus eleginoides) at Division 58.4.4b in the 2018/19 fishing season by Japan and France. The C2 and Observer data sets were provided by the CCAMLR Secretariat on the 7th August, 2019. In this paper, the data set during current fishing season (2018/19) was used for reporting the Read More
Soumis par:
Takehiro Okuda (Japon)

Approuvé par:
Taro Ichii

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The nomenclature or status assigned to individual toothfish fisheries in the CAMLR Convention Area is intended to be guided by CCAMLR’s regulatory framework. However, the status of toothfish fisheries and the regulatory framework has become increasingly disconnected in many fisheries throughout the Convention Area, particularly in relation to what is considered closed, exploratory and Read More
Soumis par:
Christopher Jones (États-Unis d'Amérique)

Approuvé par:
George Watters (États-Unis d'Amérique)

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A revised approach to the estimation of longline fisheries footprints is presented. The method uses a data-derived estimate of the uncertainty around the locations of longlines to define a buffer around these lines. Within a georeferenced framework, buffered lines are then matched to a 10km grid. The proportion of the area of each grid cell that is covered by buffered lines is then used as a Read More
Soumis par:
Stéphane Thanassekos (Secrétariat de la CCAMLR)

Approuvé par:
Doro Forck (Secrétariat de la CCAMLR)

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For this study, Antarctic toothfish samples were collected from CCAMLR Subareas 48.2, 48.4, 48.6, 88.1, 88.2 and 88.3, Divisions 58.4.1, 58.4.2 and 58.5.2, and the SPRFMO area north of Subarea 88.1. Using approximately equal sample numbers spatially across CCAMLR Areas, DNA from 761 toothfish samples were extracted and of these 547 were deemed to contain sufficient quantity and quality to be Read More
Soumis par:
Dale Maschette (Australia)

Approuvé par:
Dirk Welsford (Australia)

Publication:
2019. Final Report, FRDC Project 2017/021. Australian Antarctic Division and the Fisheries Research and Development Corporation. Kingston, Australia. ISBN 978-1-876934-33-0.

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A research plan for Subarea 88.3 was commenced by Korea in 2016 and 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 two of the Read More
Soumis par:
Alistair Dunn (Nouvelle-Zélande)

Approuvé par:
Alistair Dunn (Nouvelle-Zélande)

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The time series of relative abundance and age structure from the Ross Sea shelf survey is an important input to the Ross Sea stock assessment. The annual survey has been conducted since 2012, with a revised proposal presented in 2017 for five years (2018–2022). The objectives of the survey included monitoring the abundance and age structure of sub-adult (≤ 110 cm TL) toothfish in the south of Read More
Soumis par:
Alistair Dunn (Nouvelle-Zélande)

Approuvé par:
Alistair Dunn (Nouvelle-Zélande)

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