WG-FSA-17

In 2014, the Scientific Committee endorsed a proposal from South Africa that the Secretariat be tasked with developing a proposal for funding support from the Global Environment Facility (GEF) to build capacity among GEF-eligible CCAMLR Member countries to strengthen their participation in CCAMLR (SC-CAMLR-XXXIII, paragraph 10.30). This report updates CCAMLR Members on developments during 2017 Read More
Submitted By:
Ms Doro Forck (CCAMLR Secretariat)

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The Ross Sea region Marine Protected Area Research and Monitoring Plan

In providing this update on Information and Data Systems the Secretariat welcomes input and recommendations from Members on priorities for future work including in the formation and operation of the Data Management Group (DMG).

At last year’s meeting, it was agreed that a five-year work plan for the Scientific Committee should be developed for consideration by the Scientific Committee in 2017 (SC-CAMLR-XXXV, paragraphs 13.8 to 13.20). It was agreed that the work should be led by the Chair of the Scientific Committee with input from the conveners of its working groups and that it should be made available for Read More
Submitted By:
Dr Mark Belchier (United Kingdom)

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The attached draft Climate Change Response Work Program addresses the remaining Terms of Reference of the Intersessional Correspondence Group (ICG) to develop approaches for integrating considerations of the impacts of climate change into the work of CCAMLR (components of TORs 7 and 8). It aims to build on related work of the Commission, SC-CAMLR and its working groups, and to link with Read More
Submitted By:
Ms Eloise Carr (Australia)

Approved By:
Dr Dirk Welsford (Australia)

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Annual report on the CCAMLR marine debris monitoring program.

The first CCAMLR Scheme of International Scientific Observation workshop (WS-SISO) was held in Buenos Aires in 2017, and discussed and agreed  revisions to observer logbooks for all CCAMLR fisheries (see SC-CCAMLR-XXXVI/08). This paper summarises the proposed changes to the observer  logbooks for the longline and finfish trawl fisheries, and outlines their introduction leading up the Read More
Submitted By:
Mr Isaac Forster (CCAMLR Secretariat)

Approved By:
Mr Andrew Wright (CCAMLR Secretariat)

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Data on fish by-catch in the krill fishery from commercial catch data (100 153 hauls) and CCAMLR SISO data (20 766 hauls) up to 1 Sept 2017 was used to examine the frequency of occurrence, length-frequency distribution and geographic provenance of the key fish taxa reported. There is continued evidence of  an increase in the data quality from the observer scheme,  as well as an Read More
Submitted By:
Dr Keith Reid

Approved By:
Mr Andrew Wright (CCAMLR Secretariat)

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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. As previously reported, based on a measure of Read More
Submitted By:
Dr Keith Reid

Approved By:
Mr Andrew Wright (CCAMLR Secretariat)

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Patagonian toothfish (Dissostichus eleginoides) are found around South America from Ecuador to Uruguay, and in the sub-Antarctic and Antarctic while Antarctic toothfish (D. mawsoni) are found closer to the Antarctic continental shelf and generally south of the Polar Frontal Zone. Data from existing tagging studies indicate that both species are generally non-migratory with Read More
Submitted By:
Dr Keith Reid

Approved By:
Mr Andrew Wright (CCAMLR Secretariat)

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This report summarises fishing catch and effort in the Ross Sea region (Subarea 88.1 and SSRUs 882AB) together with biological characteristics of the catch of Antarctic toothfish through the 2017 season. In 2017, sea ice constraints were minimal and catch rates were the second highest on record, resulting in the shortest season to since the fishery started.

Median and 90%ile scaled Read More
Submitted By:
Mr Alistair Dunn (New Zealand)

Approved By:
Mr Alistair Dunn (New Zealand)

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Following the note by the Working Group in paragraph 4.21 in WG-SAM-17 report on the ice concentration analysis by Namba et al. (WG-SAM-17/10), the further analyses for the ice concentration was conducted to investigate correlations between sea-ice coverage and wider global weather phenomena such as El Niño/El Niño Southern Oscillation or rising temperatures/increased variability in the sea Read More
Submitted By:
Dr Taro Ichii

Approved By:
Dr Taro Ichii

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The ratio of female among the 600 specimens of Antarctic toothfish collected from the 58.4.1 area and 88.3 area within the CCAMLR Conservation Zone during February through March, 2013 was found to be 0.50, and displayed the tendency of increase with increase in the total length 140 cm. The gonadosomatic index of the fish was 2.5 for the female, and 1.7 for male.  The hepatosomatic index Read More
Submitted By:
Dr Seok-Gwan Choi (Korea, Republic of)

Approved By:
Dr Seok-Gwan Choi (Korea, Republic of)

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South Africa and Japan revised the next season’s (2017/18) research plan in Subarea 48.6 using the latest CCAMLR C2 and Observer data, following the recommendations and notification from WG-SAM meeting in 2017 (e.g., WG-SAM-17 report, paragraph 4.4, 4.10, and 4.18, 2017) and data extracts provided by the CCAMLR Secretariat on the 27th of July, 2017 were used.

The estimated median stock Read More
Submitted By:
Dr Takehiro Okuda (Japan)

Approved By:
Dr Taro Ichii

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Japan and France revised the next season’s (2017/18) research plan in research blocks 58.4.4b_1 and 58.4.4b_2 using the latest CCAMLR C2 and Observer data, following several advices during WG-SAM meeting in 2017. We have used extracted data provided by the CCAMLR Secretariat on 27th July, 2017.

The estimated median stock size in block 58.4.4b_1 and 58.4.4b_2 was 1452.03 and 921.91, Read More
Submitted By:
Dr Takehiro Okuda (Japan)

Approved By:
Dr Taro Ichii

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Fatty acid (FA) profile and stable isotope (SI) signature analyses has been used to examine feeding ecology of Antarctic toothfish and food webs of Antarctic marine ecosystem. Specimens of Antarctic toothfish, by-catch and their stomach contents were collected for the past five years in the eight locations of he Antarctic Waters. We investigated ontogenetic and spatial variability in resource Read More
Submitted By:
Dr Seok-Gwan Choi (Korea, Republic of)

Approved By:
Dr Seok-Gwan Choi (Korea, Republic of)

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Noting the large increase in new research proposals tabled targeting toothfish across the Convention Area, and the relative lack of progress in achieving research objectives in some areas, WG-SAM-17 recommended that the procedures for research plan proposals in data poor fisheries be compiled and further developed to bring together the advice from the Scientific Committee and its Working Read More
Submitted By:
Dr Dirk Welsford (Australia)

Approved By:
Dr Dirk Welsford (Australia)

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The annual random stratified trawl survey (RSTS) of 2017 at HIMI was conducted during April, with the completion of 163 stations. The survey has been conducted on the FV Atlas Cove since 2015. 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 station points.

The unstratified density of Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Dirk Welsford (Australia)

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This paper presents an update on the ageing of Antarctic toothfish, Dissostichus mawsoni, from East Antarctica (Division 58.4.1) and the Amundsen Sea (Subarea 88.2).  Initially, experienced readers at the Australian Antarctic Division (AAD) read a subset of 40 otoliths from the New Zealand reference collection for Antarctic toothfish, with all pairwise comparisons between readers Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Dirk Welsford (Australia)

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Exploratory longline fisheries targeting mainly Antarctic toothfish (Dissostichus mawsoni) have been operating in Divisions 58.4.1 and 58.4.2 since 2003, however robust stock assessments and catch limits according to CCAMLR decision rules have yet to be developed. A key step in developing management advice in these Divisions is understanding the distribution, abundance and boundaries Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Dirk Welsford (Australia)

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Robust stock assessments and catch limits according to CCAMLR decision rules remain to be determined for Divisions 58.4.1 and 58.4.2, and precautionary management arrangements are in place as set out in Conservation Measures 41-11 and 41-05. WG-FSA-16/29 outlined the first multi-member toothfish exploratory fishery research plan for these Divisions, including research objectives, methods and Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Dirk Welsford (Australia)

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Exploratory fishing for toothfish (Dissostichus spp.) 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 outlines the first multi-member toothfish exploratory fishery research plan for East Antarctica, including research objectives, Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr 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 in CCAMLR Division 58.5.2 with data until end of the season 2015/16. The updated assessment model is based on the best available estimates of model parameters, the use of abundance estimates from a random stratified trawl survey (RSTS), Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Dirk Welsford (Australia)

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CCAMLR XXXIV (para. 5.68) endorsed new pre-season (1-14 April) and post-season (15-30 November) trial season extensions, in addition to existing pre-season (15-30 April) and post-season (1-14 November) trial extensions in the Patagonian toothfish longline fishery in Statistical Division 58.5.2 (WG-FSA-15/48).

Australia undertook to report annually on the results of all the trials. This Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Dirk Welsford (Australia)

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Tag-loss or tag-shedding rates for tagged fish in the Patagonian toothfish (Dissostichus eleginoides) fisheries at Heard Island and McDonald Islands (HIMI) in Division 58.5.2 were estimated following the method proposed by Adam & Kirkwood (2001). Tag-loss rates were generally low, with longline-caught and recaptured fish losing their tags quicker than trawl-caught and recaptured Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Dirk Welsford (Australia)

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The annual random stratified trawl survey was undertaken in Division 58.5.2 in the vicinity of Heard Island and the McDonald Islands during April 2017. This paper provides an updated growth model and 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
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Dirk Welsford (Australia)

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Macrourus spp. are the major by-catch species in the exploratory toothfish fishery in Divisions 58.4.1 and 58.4.2. CCAMLR has previously identified three main steps to minimise bycatch; i) avoidance, ii) mitigation and iii) the setting of sustainable by-catch limits if mortality is not preventable (SC-CAMLR-XXII, paragraph 5.230). Here, we undertake a risk assessment of the effects of Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Dirk Welsford (Australia)

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The activities of the CCAMLR to minimize incidental mortality of seabirds in the course of longline fishing or longline fishing research in the Convention Area are carried out by means of: a) use a streamer line and b) control of the longline weighting rate. Currently, according to CM 24-02 (2014) and CM 25-02 (2015) which in force, vessels already use gears that do not allow birds pecking up Read More
Submitted By:
Dr Svetlana Kasatkina (Russian Federation)

Approved By:
Dr Svetlana Kasatkina (Russian Federation)

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Closed mostly within the Weddell Sea Subarea 48.5 is one of the closed data-poor CCAMLR subareas, where stock assessment should be carried out. In spite of hard ice conditions at most part of the Sea during mostly all the year, this large water area is very similar to the Ross Sea. This similarity could be found in geographical location, bathymetric profile, currents system and follows from Read More
Submitted By:
Dr Svetlana Kasatkina (Russian Federation)

Approved By:
Dr Svetlana Kasatkina (Russian Federation)

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Russian Federation is going to continue investigation for toothfish in Ross Sea. The previous Russian program was undertaken in the Subarea 88.2 in 2010–2012. This paper presents the research program in the frame of the research and monitoring associated with the RSRMPA.

Russian research program have objectives to investigate the life-cycle, distribution and movement, biological Read More
Submitted By:
Dr Svetlana Kasatkina (Russian Federation)

Approved By:
Dr Svetlana Kasatkina (Russian Federation)

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This document contains the research plan proposed by the Chilean Delegation in the Subarea 48.2 including the observations suggested by the Working Group on Statistics, Assessments and Modelling (WG-SAM) during the meeting held in Buenos Aires, Argentina, on 26 to 30 June 2017. Among the  recommendations adopted, coordination was achieved with the Delegation of Ukraine to develop research Read More
Submitted By:
Dr César Cárdenas (Chile)

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The Republic of Chile completely revised its initial plan for a three-year project to study the distribution, abundance and biological characteristics of Antarctic demersal fish communities after the first survey had been undertaken in 2016. The revised proposal is planned to run from 2018 to 2020. Based on the experience gained in the first phase of research and recommendations made by WG-SAM Read More
Submitted By:
Dr César Cárdenas (Chile)

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The CCAMLR Scientific Committee in 2016 reviewed three scientific background documents in support of the development of a CCAMLR MPA in the Weddell Sea. Germany was asked to carry out further work, in particular regarding the issues and questions raised at WG-EMM-16 and SC-CAMLR-XXXV.

Here, the authors intend to update the Working Group on Fish Stock Assessment on the current state of Read More
Submitted By:
Dr Katharina Teschke (Germany)

Approved By:
Professor Thomas Brey

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In order to explore aspects related to the structure of population units and habitat use of Dissostichus spp. within CCAMLR Subarea 48.2, the elemental composition of nuclear and marginal sections of 10 otoliths from adults of D. eleginoides and 20 otoliths from adults of D. mawsoni from samples of otoliths collected during the first season of the research carried Read More
Submitted By:
Dr César Cárdenas (Chile)

Approved By:
Dr César Cárdenas (Chile)

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The third year research survey of Ukraine in Subarea 48.2 by the fishing vessel SIMEIZ is finished. Ukraine proposes to continue survey in same boundary for the next 2 year.

Ukraine proposes to carry out a scientific survey of Dissostichus spp. by bottom longline in the eastern part of Subarea 48.1.

Ukraine proposes to conduct survey in three research blocks in Division 58.4.2 during the season 2017/18. 

The research of Dissostichus in Subarea 88.3 carried out by Chile in 1998, New Zealand in 2005, Russia in 2011 and 2012 and the Republic of Korea in 2016. It was noted that no tagged fishes were recaptured during the previous research activities. Studies are planned to be conducted from January to April, as ice conditions permit. It is planned that the number of longline sets will be Read More
Submitted By:
Dr Leonid Pshenichnov (Ukraine)

Approved By:
Dr Kostiantyn Demianenko (Ukraine)

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Ukraine proposes a plan for scientific research in Statistical Subarea 88.1 for vessels SIMEIZ, KOREIZ, CALIPSO and MARIGOLDS based on the provisions of paragraph 2 of Conservation Measure 91-05. Studies are expected to be conducted in the Special Research Zone.

We provide a summary of the mark-recapture data inputs to the 2017 Ross Sea region stock assessment.

A total of 44 827 Antarctic toothfish have been released and 2473 recaptured, and 1 191 Patagonian toothfish released and 103 recaptured since 2001. Effective tagging survival and tag detection rates for each vessel were calculated. In the last few years the effective tagging survival is Read More
Submitted By:
Mr Alistair Dunn (New Zealand)

Approved By:
Mr Alistair Dunn (New Zealand)

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We provide an update of the Bayesian sex and age structured population stock assessment for Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea region (Subareas 88.1 and SSRUs 88.2A–B), using catch, catch-at-age, and tag-recapture data from 1998 to 2017 and including the results from the Ross Sea Shelf survey from 2012 to 2017. The model estimates of unfished biomass and Read More
Submitted By:
Mr Alistair Dunn (New Zealand)

Approved By:
Mr Alistair Dunn (New Zealand)

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We provide extensive diagnostic plots for the 2017 models R1 and R3 for Antarctic toothfish in the Ross Sea as recommended by WG-SAM-15 (2015). The stock assessment rationale and models as well as their main diagnostics are described in Mormede (2017). The CASAL files for the assessment models were provided to the CCAMLR Secretariat as a zip file.

In this paper we present the results Read More
Submitted By:
Mr Alistair Dunn (New Zealand)

Approved By:
Mr Alistair Dunn (New Zealand)

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Fishing in the Amundsen Sea region (SSRUs 882C–H) has been managed through a research plan since the 2015 fishing season. The aim of the research plan is to collect sufficient information to carry out a reliable stock assessment of the toothfish stock in that area. In this report, we assess if the research plan is thus far achieving its goals and if the current fishing level is deemed Read More
Submitted By:
Mr Alistair Dunn (New Zealand)

Approved By:
Mr Alistair Dunn (New Zealand)

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Exploratory fishing for toothfish (Dissostichus spp.) in Subarea 88.3 began with a survey by Chile in 1999. Since then there have been research surveys by New Zealand (2005), Russia (2011 and 2012) and Korea (2016 and 2017). However, there is still considerable uncertainty about the abundance of Antarctic toothfish in Subarea 88.3 and the Scientific Committee has requested members Read More
Submitted By:
Mr Alistair Dunn (New Zealand)

Approved By:
Mr Alistair Dunn (New Zealand)

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In 2011, the Scientific Committee endorsed the procedure for training and accreditation presented in SC-CAMLR-XXX/08, and invited Members to participate in a trial of the initial review and technical peer review. These are described in Parts a–c of the proposed procedure for a CCAMLR observer training program accreditation scheme (COTPAS, SC-CAMLR-XXX, paragraphs 7.19 to 7.20 Read More
Submitted By:
Mr Alistair Dunn (New Zealand)

Approved By:
Mr Alistair Dunn (New Zealand)

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This paper includes updated local biomass estimates of toothfish populations with bootstrapped confidence intervals using both CPUE-by-seabed area and Chapman biomass estimation methods agreed at WG-SAM-16 with revisions to the CPUE-by-seabed area parameter values agreed at WG-SAM-17. The analysis includes Research Blocks in Subareas 48.2, 48.6, 58.4 and 88.3. Given the changes in CPUE-by- Read More
Submitted By:
Dr Lucy Robinson (CCAMLR Secretariat)

Approved By:
Mr Andrew Wright (CCAMLR Secretariat)

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The three 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. Obtained data will be used for the future biomass estimation of the target species and making decision for the possible future fishing Read More
Submitted By:
Dr Leonid Pshenichnov (Ukraine)

Approved By:
Dr Kostiantyn Demianenko (Ukraine)

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1. The 2017 UK groundfish survey took place over the South Georgia and Shag Rocks shelf on the FV Sil between the 30th January – 7th February 2017.

2. 72 random hauls were completed covering depths of between 100 and 350m.

3. Overall biomass of Mackerel icefish (Champsocephalus gunnari) was calculated at 91,049 t with a lower 1-sided 95% interval estimate of 37,514t. Read More
Submitted By:
Dr Mark Belchier (United Kingdom)

Approved By:
Dr Chris Darby

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This paper outlines the specific research objectives and plan to achieve them for the second year of an agreed 3-year longline survey, in the wider context of connecting the recently undertaken surveys in Subarea 48.2 with the established fishery in Subarea 48.4. The overall research objectives include determining population connectivity between these Subareas, improving understanding of Read More
Submitted By:
Dr Marta Söffker (European Union)

Approved By:
Dr Chris Darby

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A stratified bootstrap of icefish catch density based on the UK 2017 demersal fish survey catch rate data indicated a biomass of 91 531 tonnes (lower one sided 5th percentile: 47 424 tonnes) within Statistical Subarea 48.3. Projections for the 2017/18 and 2018/19 seasons applying the CCAMLR harvest control rule lead to catch limits (TAC) of 4 733 tonnes for 2017/18 and 3 269 tonnes for Read More
Submitted By:
Dr Marta Söffker (European Union)

Approved By:
Dr Chris Darby

Request Meeting Document

The stock of Antarctic toothfish (D. mawsoni) in CCAMLR Subarea 48.4 is estimated from tagging returns to be 979.3 tonnes in 2017. Applying the CCAMLR agreed precautionary assumption of average biomass across the time series and harvest rate of γ = 0.038, implies a 2017/18 yield of 37 tonnes compared to the 2016/17 catch limit of 38 tonnes.

After many years of close to zero incidental seabird mortality in the longline fishery throughout the CCAMLR Convention Area, recent years have seen an increase in Subarea 48.3 and in Division 58.5.2. At the same time, concern has been expressed about the suitability of the method used to raise the observer data and to estimate total seabird mortality. Given the high profile of this issue in Read More
Submitted By:
Dr Chris Darby

Approved By:
Dr Chris Darby

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This working document provides details of a modification in the method of calculating length distributions used in the assessment of Champsocephalus gunnari from the length distributions of individual hauls. The effect of these changes in method have little impact on the catches that would have been permitted based on the 2011 and 2013 surveys, but has a larger impact on the catch Read More
Submitted By:
Dr Chris Darby

Approved By:
Dr Chris Darby

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This paper describes an updated CASAL based assessment and stock projection for Patagonian toothfish (D. eleginoides) in Subarea 48.4.

Assessment of the Patagonian toothfish (D. eleginoides) in Subarea 48.3 indicates that the current status of the stock is at 51% of B₀. Spawning biomass has been increasing in recent years. Projections indicate that a constant catch of 2 600 tonnes in the 2017/18 and 2018/19 seasons would be consistent with the CCAMLR decision rule.

Submissions for new research proposals and data collection programmes on D. mawsoni in Subarea 48 have recently become widely dispersed with little co-ordination or integration into existing programmes and their objectives. Without regional co-ordination, research in this area is unlikely deliver the objectives of the Commission, across the whole of Area 48.

Co-ordinated by WG- Read More
Submitted By:
Dr Chris Darby

Approved By:
Dr Chris Darby

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In Division 58.4.3a, since 2012, research fishing has been conducted in the research block by two vessels using longline: “Shinsei Maru No. 3” (Japan) and the “Saint André” (France). The catch limit for Dissostichus spp. is 32 tonnes in 2014/2015 and the total reported catch up was 16.3 tonnes. For the season (2015/16), the catch limit was unchanged (32 Read More
Submitted By:
Dr Jean-Baptiste Lecomte (France)

Approved By:
Dr Marc Eléaume (France)

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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 (kg/1000 Read More
Submitted By:
Dr Svetlana Kasatkina (Russian Federation)

Approved By:
Dr Svetlana Kasatkina (Russian Federation)

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Knowledge of recruitment dynamics, and in particular trends in recruitment and recruitment variability, are key inputs for integrated assessments of fish stocks. A quantitative longline survey monitoring the recruitment of Antarctic toothfish (Dissotichus mawsoni) in the southern Ross Sea was started in 2012. The first year established the feasibility of carrying out Read More
Submitted By:
Mr Alistair Dunn (New Zealand)

Approved By:
Mr Alistair Dunn (New Zealand)

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This paper summarises the data collected by Scientific Observers operating in the Convention Area on board fishing vessels during the 2017 season (based on data received by the Secretariat up to 15 September 2017). Information on observer deployments, incidental mortality and fish sampling are presented.

This paper presents the latest developments in models for Crozet following the more recent ones (Sinègre & Duhamel, 2016) with an updating of input data from the more recent years (up to 2016/17 season) and a reassessment of stocks taking into account the previous remarks of the WG-FSA meetings.

This paper presents the latest developments in model of Kerguelen with an updating of input data from the more recent years (up to 2016/17 season) and a reassessment of stocks taking into account the previous remarks of the WG-FSA meetings.

Norway proposes a plan to investigate the toothfish populations in the Statistical Subarea (SS) 48.6 in 2017/18 using standardised longline gear, established tagging techniques, pop-up tags and acoustic techniques. The proposed research is pertinent to issues raised by the Scientific Committee (SC-CAMLR-XXXV, paragraph 3.3.252-3.265) and will supplement and expand existing efforts to Read More
Submitted By:
Dr Olav Rune Godø (Norway)

Approved By:
Dr Olav Rune Godø (Norway)

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Following discussion at the Scientific Committee in 2016, we propose a process for independent review of CCAMLR integrated toothfish stock assessments based on the process used by the Center for Independent Experts (CIE, NOAA), and the benchmarking process used by ICES.

In 2017, a bottom trawl survey (PoKer 4) was undertaken at Kerguelen Islands (Division 58.5.1) to collect information about the size distribution and the biomass status of mackerel icefish, Champsocephalus gunnari. Data from this random stratified trawl survey was used for a short term assessment of C. gunnari on Kerguelen EEZ. The standard CCAMLR methods were used to provide Read More
Submitted By:
Mr Romain Sinegre (France)

Approved By:
Dr Marc Eléaume (France)

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Length-weight relationships (LWRs) of six fish species in the Southern Ocean, which commonly associated with Antarctic krill fishery, were determined. Samples were collected with Chinese krill trawler (codend mesh size 2 cm) in the Atlantic sector of the Southern Ocean from January to August 2016. Data on LWRs and the relationships between standard length and total length of those species were Read More
Submitted By:
Professor Guoping Zhu (China)

Approved By:
Dr Xianyong Zhao (China)

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Electron subantarctic (Electrona carlsbergi) is one of important pelagic myctophidae which circumpolar distributed between the warm waters of the subtropical confluence zone and the Southern Ocean. The distribution, life history and migration pattern of this species were examined using the biological data in 1990s, however, the habitat shift of this species was still unclear. The Read More
Submitted By:
Professor Guoping Zhu (China)

Approved By:
Dr Xianyong Zhao (China)

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We present preliminary results on age and growth of Dissostichus mawsoni for the third season (2015/16) of the Spanish research fishing in the 58.4.1 Division obtained for growth rings on otolith readings. It is included the growth parameters estimates by sex. Growth parameters obtained using length-age pair values are: L∞: 208.2, k: 0.074 and t0: 0.564 for females; L∞: 173, k: 0.089 Read More
Submitted By:
Mr Roberto Sarralde Vizuete (Spain)

Approved By:
Dr Eduardo Balguerías

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Owing to commercial fishing during the late 1970s/early 1980s, targeted notothenioid species had become depleted around the South Shetland Islands. Herein we report subsequent changes in the prevalence of three species, Notothenia rossii, Gobionotothen gibberifrons and Notothenia coriiceps in Potter Cove, King George Islands/ Isla 25 de Mayo, in a 33-year effort to Read More
Submitted By:
Dr Esteban Barrera-Oro (Argentina)

Publication:
Polar Biol., 201 (2017): 1–8, http://dx.doi.org/10.1007/s00300-017-2125-0

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In the present study, the concentrations of total mercury in different organs of the Antarctic toothfish (Dissostichus mawsoni) collected from CCAMLR research blocks in Subarea 88.3 and Division 58.4.1 off the coast of Antarctica were determined. The results revealed total mercury concentrations of 0.165 ± 0.095 mg/kg (0.023–0.454 mg/kg) in the Antarctic toothfish. In fish muscle, Read More
Submitted By:
Dr Seok-Gwan Choi (Korea, Republic of)

Approved By:
Dr Seok-Gwan Choi (Korea, Republic of)

Publication:
Arch. Environ. Con. Tox. (in press)

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Stomach contents of the Antarctic toothfish, Dissostichus mawsoni, collected from Subareas 58.4 and 88.3 were analyzed using next generation sequencing (NGS) technology. After processing the raw reads generated by the MiSeq platform, a total of 131,233 contigs (130 operational taxonomic units [OTUs]) were obtained from 163 individuals in subarea 58.4, and 75,961 contigs (105 OTUs) Read More
Submitted By:
Dr Seok-Gwan Choi (Korea, Republic of)

Approved By:
Dr Seok-Gwan Choi (Korea, Republic of)

Publication:
PeerJ (in press)

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This study investigated maturation and spawning of Patagonian toothfish Dissostichus eleginoides in the Heard Island and McDonald Islands (HIMI) fishery on the Kerguelen Plateau in the Indian Sector of the Southern Ocean based on gonads and otoliths collected between years 2004–2015, and using histological analyses and calibration of macroscopic staging criteria. Dissostichus Read More
Submitted By:
Dr Philippe Ziegler (Australia)

Approved By:
Dr Dirk Welsford (Australia)

Publication:
J. Fish Biol. (accepted), doi: 10.1111/jfb.13479

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This paper proposes to continue the Ross Sea shelf toothfish survey for the next five years, 2018–2022. The first objective of the survey is to monitor toothfish recruitment in the southern Ross Sea (core strata). This is a continuation of the yearly time series of research surveys of these strata carried out since 2012. It is important to continue the time series as the data collected provide Read More
Submitted By:
Mr Alistair Dunn (New Zealand)

Approved By:
Mr Alistair Dunn (New Zealand)

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