WG-SAM-15

Having accurate surface area estimates of toothfish (Dissostichus spp) habitats is important for CCAMLR in estimating the fishable biomass of these species in data-poor areas, developing scientific survey designs and models of habitat use.  Planimetric seabed areas (i.e. a two-dimensional surface) within the Convention area are commonly calculated, but surface area (i.e. a three- Read More
Soumis par:
Doro Forck (Secrétariat de la CCAMLR)

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In the 2012/13 fishing season Spain began implementing a multi-annual Research Plan for Divisions 58.4.1 and 58.4.2 in order to estimate local biomass of Dissostichus spp. by means of two methods: depletion and tagging. In 2014/15 the vessel was unable to conduct the proposed research experience due to problems with a blade of the propeller, During the season 2015/16 is intended to Read More
Soumis par:
Pedro Sepúlveda Angulo (Espagne)

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The current season (2014/15) is the final one of the first three-season research which began in 2013 in data-poor fisheries. In the present report, catch, effort and biological data recorded by all effective vessels were analyzed for the improvement of stock assessment in the research blocks. Based on the result, the next three-season (2016-18) research plan in Division 58.4.3a is also Read More
Soumis par:
Chika Fukugama (Japon)

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The current season (2014/15) is the final one of the first three-season research which began in 2013 in data-poor fisheries. In the present report, catch, effort and biological data recorded by all effective vessels were analyzed for the improvement of stock assessment in the research blocks. Based on the result, the next three-season (2016-18) research plan in Division 58.4.2 is also Read More
Soumis par:
Chika Fukugama (Japon)

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The current season (2014/15) is the final one of the first three-season research which began in 2013 in data-poor fisheries. In the present report, catch, effort and biological data recorded by all effective vessels were analyzed for the improvement of stock assessment in the research blocks. Based on the result, the next three-season (2016-18) research plan in Division 58.4.1 is also Read More
Soumis par:
Chika Fukugama (Japon)

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The current season (2014/15) is the final one of the first three-season research which began in 2013 in data-poor fisheries. In the present report, catch, effort and biological data recorded by all effective vessels were analyzed for the improvement of stock assessment in the research blocks. Based on the result, the next three-season (2016-18) research plan in Subarea 48.6 is also presented Read More
Soumis par:
Chika Fukugama (Japon)

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Most things related to Dissostichus spp. in the eastern side of Antarctic has not been known well as namely the area is data poor areas. In the Division 58.4.1 there are two stocks; one extends from the SSRU 58.4.1C to the SSRU 58.4.2A, and the other one to the SSRU 58.4.1H. The population sizes were vulnerable with a big range of about 1,000-2,000 t per SSRU in 58.4.1. During the Read More
Soumis par:
Seok-Gwan Choi (Corée, Rép. de)

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The Subarea 48.5 is a large area contained from 60°W to 20°W where has been closed to directed fishing for long time and is not even subdivided into any SSRUs. Republic of Korea noted that it could be because of the lack of information on this region. The research surveys were conducted in this area for two years. The Republic of Korea noted that the research activities in this region had Read More
Soumis par:
Seok-Gwan Choi (Corée, Rép. de)

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The subarea 88.3 is a large area contained from 105°W to 70°W where has been closed to directed fishing following the results of a Chilean survey activities in 1998 (SC-CCAMLR-XVII/BG/7). Previous three research surveys conducted by the New Zealand and the Russian flagged vessels since 1998. It was noted that 8 D. Mawsoni were tagged by the New Zealand in the 2004/2005 season and 123 Read More
Soumis par:
Seok-Gwan Choi (Corée, Rép. de)

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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 assessment and catch limits according to CCAMLR decision rules remain to be determined for these Divisions. Accordingly, a research plan has been developed under Conservation Measure 41–01 to support a proposal for an Australian vessel to participate in Read More
Soumis par:
Dirk Welsford (Australia)

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In Division 58.4.3a, since 2012, research fishing has been conducted in the research block by two vessels using longlines: Shinsei Maru No. 3 (Japan) and the Saint André (France). The catch limit for Dissostichus spp. is 32 tonnes and the total reported catch up in 2013/2014 was 32 tonnes. France notified its intention to continue its exploratory fishery over the coming years in order Read More
Soumis par:
Aurore Daux (France)

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In this document, we revise stock status assessments of D. eleginoides in research blocks 58.4.4b_1 and 58.4.4b_2 using CPUE analogy method, Petersen method and CASAL model. Detailed results using CASAL models in research block 58.4.4b_1 are described in a separated document.

The estimated stock size in block 58.4.4b_1 was 597, 336 and 553 tonnes in CPUE analogy method, Read More
Soumis par:
Chika Fukugama (Japon)

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A survey was conducted to collect data of stock status and various biological information of toothfish in the research blocks 58.4.4b_1 (SSRU 58.4.4C) and 58.4.4b_2 (SSRU 58.4.4D) of Division 58.4.4b (Ob Lena Banks) from July 18 to September 20, 2014. A total of 88 hauls using normal trotline system were made in the blocks. Total catch of Dissostichus eleginoides (excluding those Read More
Soumis par:
Chika Fukugama (Japon)

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Exploratory fishing for toothfish (Dissostichus spp.) in Division 58.4.2 began in 2003. Robust stock assessment and catch limits according to CCAMLR decision rules remain to be determined for this Division. In 2014, the fishery was limited to one Japanese and one Spanish flagged vessel using longlines only, but there was no fishing activity. France notifies its wish to collaborate in Read More
Soumis par:
Jonathan Cholet (France)

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Exploratory fishing for toothfish (Dissostichus spp.) in Division 58.4.1 began in 2003. Robust stock assessment and catch limits according to CCAMLR decision rules remain to be determined for this Division. In 2008, only one vessel, Tronio, has conducted research fishing in accordance with a research plan submitted under CM 24-01. France notifies its wish to collaborate in this Read More
Soumis par:
Jonathan Cholet (France)

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Closed mostly within the Weddell Sea Subarea 48.5 is one of the closed data-poor CCAMLR Subareas. Stock assessment of this area should be calculated basing on the newest and adequate data. Despite the difficult ice conditions the Weddell Sea is the largest enclosed near-continental sea of the Antarctic which is very similar to the Ross Sea in some respects like shape, bathymetrical profile and Read More
Soumis par:
Andrey Petrov

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Over the last three years at the meetings of WGs and CCAMLR SC a question about research TAC in open and closed SSRUs of the Ross Sea has been raised. In accordance with established practice, as a rule, if research goes on in open SSRU then the necessary catch limits are taken from the unit`s TAC. If research fishing goes on in closed SSRU then as a rule catch limits are taken from the biggest Read More
Soumis par:
Andrey Petrov

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Russian Federation is going to continue investigation for toothfish in Ross Sea in fishing seasons 2015-2018. The present program aims to recapture tagged fishes released during the implementation of the previous research program took place in 2010-2012 fishing seasons and investigate resource potential and life cycle of Dissostichus species within the eastern part of the Ross Sea Read More
Soumis par:
Andrey Petrov

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Result of the Russian research program in the Subarea 48.5 (Weddell Sea) in season 2012-2013 were analysed in accordance with the Scientific Committee recommendations (CAMLR-SC-XXXIII, par. 3.230 – 3.234).

Following the recommendation of WG-FSA in 2014 the Secretariat has undertaken an analysis of by-catch in CCAMLR longline fisheries. The numerical target catch ratio (the number of target fish as a proportion of the total number of fish caught), using haul by haul data from the Ross Sea toothfish fishery from 2008–2014, was used as a single metric to examine the amount of by-catch reported by Read More
Soumis par:
Doro Forck (Secrétariat de la CCAMLR)

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We made two sensitivity runs of age-structured and two fisheries (≥1300 m and < 1300 m) CASAL models for stock status assessments of Dissostichus eleginoides in the research block 58.4.3a_1 following the recommendations of the WG-FSA-2014 meeting. Two runs were carried out: including or excluding the data from fish tagged in 2012.

The likelihood profiles for tagged fish Read More
Soumis par:
Chika Fukugama (Japon)

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We made five sensitive runs of single-sex age-structured CASAL models for stock status assessments of Dissostichus eleginoides in the research block 58.4.4b_1 following the recommendation of the WG-FSA-2014 meeting. IUU catch was estimated within the models using disease mortality functionality. Firstly four sensitive runs were made as follows: 1) inclusion of all observations and Read More
Soumis par:
Chika Fukugama (Japon)

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In this paper, we describe developments towards a set of standard diagnostic principles and tools used to characterise assessment models. CCAMLR has yet to develop a set of recommended statistical diagnostics tools to support their evaluations. While there are a number of standard visual and statistical diagnostics available for integrated assessments, their sufficiency to evaluate if a model Read More
Soumis par:
Philippe Ziegler (Australia)

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Depredation, the removal of fish from longlines by large marine predators, has been observed throughout the CCAMLR management area. Loss of fish through depredation can cause financial loss to the toothfish fishing industry and if not considered appropriately may lead to a bias in stock assessments through the underestimation of total mortality resulting from fishing and depredation combined. Read More
Soumis par:
Chris Darby

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Marine depredation (removal of fish from longline hooks by marine predators) is a growing issue in fisheries around the world. Within the CCAMLR management killer whales and to a lesser extent sperm whales cause greatest disruption to longline fishing activities for toothfish (Dissostichus sp.). Several measures have been developed and tested over the years to mitigate depredation by Read More
Soumis par:
Chris Darby

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Characterisation of fishery selection is key to reducing uncertainty in the assessment and management advice provided for CCAMLR toothfish stocks. Toothfish migrate towards deeper waters as they age and increase in size and, in combination with the practical difficulties associated with deploying fishing gear at increasing depths, there is the potential for a dome shaped Read More
Soumis par:
Chris Darby

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A link between D. eleginoides stocks in Subareas 48.3 and 48.4 has been speculated for some time. Different growth rates and maturity suggest that there is no regular exchange between the two areas, but tag recapture data clearly show a small number of toothfish moving between them, while genetic analysis also indicates that both stocks belong mostly to the same genetic Read More
Soumis par:
Chris Darby

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A multi-year, multi-Member research program was established to map and sample the fishable areas of SSRUs 88.2 A–B north of 66° S latitude. During the 6^th - 10^th February 2015, the UK fishing vessel Argos Froyanes surveyed SSRU 88.2 A research block 4 defined in the multi-Member 88.2 offshore research survey. Bathymetric data was collected and longline fishing conducted Read More
Soumis par:
Chris Darby

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Toothfish in SSRUs 882.A–B are currently managed as part of the Ross Sea region stock, but the stock structure and fish movement patterns are uncertain and more information is required for the management across all of the region. Recognising this requirement, the Scientific Committee endorsed two years of spatially stratified longline surveys in the northern region of SSRUs 88.2A–B (SC-CAMLR Read More
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Chris Darby

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The Secretariat has embarked on a major overhaul of CCAMLR data holdings and associated IT and data infrastructure. This work, which begun in 2013, includes developing an Enterprise Data Model, redeveloping the CCAMLR database, improving data quality assurance, and modernising the data work flow.

The user community can expect to notice significant improvements in data quality and Read More
Soumis par:
Doro Forck (Secrétariat de la CCAMLR)

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For the 2014 assessment of Patagonian toothfish (Dissostichus eleginoides) around the Heard Island and McDonald Islands (HIMI) in Division 58.5.2, a prior for catchability q of the random stratified trawl survey (RSTS) was estimated by comparing abundance estimates of the survey with abundance estimates calculated from the tag-recaptures data on the main trawl ground. Here, Read More
Soumis par:
Philippe Ziegler (Australia)

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The research fishing had conducted in Divisions 58.4.1 and 58.4.2 from 12 November 2014 to 24 March 2015. Total 9 species including D. mawsoni had occurred, and D. mawsoni were caught 4,016 individuals with 131,992 kg. The research fishing using tags were conducted according to the CCAMLR CM, and 706 individuals were tagged and released for tagging recovery. And both of Read More
Soumis par:
Seok-Gwan Choi (Corée, Rép. de)

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This paper provides an update on the ongoing FRDC-funded research project to develop robust assessment methods and harvest strategies for spatially complex, multi-jurisdictional toothfish fisheries. The project aims to develop a spatially-explicit model framework that captures the important spatial characteristics of current and historical fishing by France and Australia, and the underlying Read More
Approuvé par:
Admin Admin (Secrétariat de la CCAMLR)

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The investigations in March-April 2015 were conducted in subarea 48.2 in accordance with the recommendations of the Commission (CCAMLR-XXXIII). Presented some preliminary scientific results of the research survey.

A multi-year plan for research by Japan and South Africa aimed at yielding a tag-based assessment of the Dissostichus resource in statistical Subarea 48.6 was adopted in 2012 and formulated in CM 41-04. This paper submits a work plan for the South African contribution to the fourth year of this research in 2015/16 and is to be read in conjunction with progress report.

During March-April 2015 Ukraine began the research within statistical subarea 48.2 in accordance with the recommendations of CCAMLR-XXXIII. The certain number of the following bottom long line surveys are proposed to be conducted during March-April 2016. The research surveys will be conducted by the Ukrainian flagged FV SIMEIZ. The data collected in first year of the research showed the Read More
Soumis par:
Leonid Pshenichnov

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Toothfish in SSRUs 882.A–B are currently managed as part of the Ross Sea region stock, but the stock structure and fish movement patterns are uncertain and more information is required for the management across all of the region. Recognising this requirement, the Scientific Committee endorsed two years of spatially stratified longline surveys in the northern region of SSRUs 88.2A–B (SC-CAMLR Read More
Soumis par:
Olav Rune Godø (Norvège)

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A multi-year, multi-member research program was established to map and sample the fishable areas of SSRUs 88.2 A–B north of 66° S latitude. During the 5^th - 7^th February 2015, the Norwegian fishing vessel FV Seljevær surveyed SSMRU 88.2 A, research block 3, defined in the multi-Member 88.2 offshore research survey. Bathymetric data were collected and Read More
Soumis par:
Olav Rune Godø (Norvège)

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In 2014, FSA-14-36r1 presented a new assessment of Patagonian toothfish in the French EEZ. A singularity in the tagging fits was observed by the working group. A lower number of recaptures in the first year compare to the second year was noted (figure1). This paper is an overview of tagging data in Kerguelen area and the impacts on the Casal assessment.

At its 2011 meeting, the Scientific Committee agreed that a time series of relative abundance from a well-designed survey could be a useful input into the Ross Sea stock assessment model. The first three surveys were completed in February 2012, 2013, and 2014. In this paper we provide results of the fourth survey in the time series. The objectives of this survey were: (1) To Read More
Soumis par:
Rohan Currey (Nouvelle-Zélande)

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A research proposal to continue the southern Ross Sea sub-adult toothfish survey for the next two years, 2016–2017, is presented. The survey will continue to focus primarily on estimating the relative abundance of sub-adult (<110 cm TL) toothfish in the core strata (A, B, C) in SSRUs 88.1J and 88.1L. This is a continuation of the time series of CCAMLR-sponsored research surveys of these Read More
Soumis par:
Rohan Currey (Nouvelle-Zélande)

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New Zealand FV Janas conducted research in two research blocks (882A_5 and 882B_4) as part of a multi-year and multi-member research plan using standardised longline gear to sample toothfish populations in the northern areas (60°‑ 66° S) of Subarea 88.2 SSRUs A–B. Sampling strategy and data collection adhered to standards set in CM 41-10 (2014). A total of 49.85 t of Antarctic Read More
Soumis par:
Rohan Currey (Nouvelle-Zélande)

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We propose to conduct a scientific survey during the austral winter in the northern Ross Sea region to investigate spawning dynamics of Antarctic toothfish, as requested by the Scientific Committee in 2013. The longline survey is designed to cover key gaps in the knowledge of the life cycle of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea by collecting biological samples Read More
Soumis par:
Rohan Currey (Nouvelle-Zélande)

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Management Strategy Evaluation (MSE) has been acknowledged as the best practice to take account of uncertainties in the assessment of stocks and as a method to ensure robust management approaches. The Scientific Committee of CCAMLR has recommended MSE be used to determine the extent to which the management objectives for toothfish fisheries are being met. While the choice of management targets Read More
Soumis par:
Rohan Currey (Nouvelle-Zélande)

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Two-area population models for Antarctic toothfish in the Amundsen Sea Region were developed further as current single area models did not fully explain the patterns in the observed data on tag recaptures and age composition. Although the hypothesised stock structure spans SSRUs 88.2C–H, these models were limited to data collected in SSRU 88.2H as there were few data available to inform Read More
Soumis par:
Rohan Currey (Nouvelle-Zélande)

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A multi-year research plan as outlined in CM 41-04 (2012, 2013 & 2014) was initiated Statistical Subarea 48.6 by Japan and South Africa during the 2012/13 fishing season. Two vessels participated in the research project in each of the three fishing seasons and the progress achieved during the first 2.5 years is reported.

Between December 2012 and April 2015 a total of 291 Read More
Soumis par:
Rob Leslie (Afrique du Sud)

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Subareas 58.6 and 58.7 are closed to fishing outside of the Exclusive Economic Zones (EEZs) around the Crozet (France) and Prince Edward (South Africa) Archipelagos. The current boundary between Subareas 58.6 and 58.7 bisects the South African EEZ around the Prince Edward Islands. Thus fishery statistics reported for Subarea 58.7 reflects only part of the fishery in the South African EEZ, Read More
Soumis par:
Rob Leslie (Afrique du Sud)

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Regarding the low levels of stocks of Dissostichus spp. and the high levels of IUU fishing, CCAMLR decided to close the fishery in 2002 in division 58.4.4. Since 2008 only one vessel, Shinsei maru No. 3, had conducted research fishing in accordance with a research plan submitted under CM 24-01. In 2014, WG-FSA agreed research fishing conducted in the research blocks C and D by two Read More
Soumis par:
Jonathan Cholet (France)

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A proposal for conducting a reserach cruise for Dissostichus spp. in Subarea 48.2 is presented by Chile.

The proposal seeks to estimate presence and abundance of Dissostichus species in a data-poor area. The reserach proposed, if approved, will be conducted for three seasons.

This paper reports analysis of CPUE data on cod in the Barents Sea.  The potential of fleet effort standardisation is explored based on vessel calibration factors, which are established when vessel trawling operations take place at acceptable proximity in time and space. The methodological approach might be of interest for the longline fishery for tothfish as well as for the trawl fishery Read More
Soumis par:
Olav Rune Godø (Norvège)

Publication:
Fish. Res., 49 (2001): 271–281

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