WG-SAM-14

Historical catch and effort data recorded by all effective vessels were analyzed using the latest CCAMLR C2 and observer data toward the development of research plan for the 2014/15 exploratory fishery of toothfish in Subarea 48.6.

The stock sizes for five research blocks (486_1, 486_2, 486_3, 486_4 and 486_5) were estimated by the Petersen estimator and the CPUE x seabed analogy Read More
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Ms Doro Forck (Secretaría de la CCRVMA)

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Historical catch and effort data recorded by all effective vessels were analyzed using the latest CCAMLR C2 and observer data toward the development of research plan for the 2014/15 exploratory fishery of Dissostichus mawsoni in Subarea 58.4.1.

The stock sizes for five research blocks (5841_1, 5841_2, 5841_3, 5841_4 and 5841_5) were estimated by the Petersen estimator and the Read More
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Ms Doro Forck (Secretaría de la CCRVMA)

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Historical catch and effort data recorded by all effective vessels were analyzed using the latest CCAMLR C2 and observer data toward the development of research plan for the 2014/15 exploratory fishery of Dissostichus mawsoni in Subarea 58.4.2.

The stock size for a research block (5842_1) was estimated by the CPUE x seabed analogy method using an appropriate reference area ( Read More
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Historical catch and effort data recorded by all effective vessels were analyzed using the latest CCAMLR C2 and observer data toward the development of research plan for the 2014/15 exploratory fishery of Dissostichus eleginoides in Division 58.4.3a.

The stock size for block 5843a_1 was estimated using the Petersen estimator and the CPUE x seabed analogy method using effective Read More
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Results of longline survey on Antarctic toothfish in the Weddell Sea (Stage II) are presented in the paper. Options I and II of the survey were carried out from February 10 to February 22, 2014. A total of 34 longlines were set: the Option I – 10+20 and the Option II – 4 at the depths ranging from 605 to 2031 m. A total number of hooks – 116 100, area – 13565 km². Catch value of the Read More
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Russian Federation intends to continue research in Subarea 88.2 that began in 2010-2012. The main objectives are studying of toothfish migration from SSRU 88.1 K to Subarea 88.2 A.

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 Weddell Sea during most time of the year, this large water area is very similar with the Ross Sea. This similarity, which could be found in geographical location, bathymetric profile, currents system Read More
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Stock assessment of the Antarctic toothfish in the Subarea 88.2 H using Peterson method is presented in this paper. Calculated stock value of the Antarctic toothfish in the Subarea 88.2 H is 9307 t with 95% confidence interval ranging from 7502 t to 11967 t. In 2014-2015 values of potential catch with incomplete taking of 3%, 5% and 10% were determined as 280 t, 465 t and 931 t, respectively Read More
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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. This research will continue in the 2014/15 season if ice conditions allow for the vessel's operations, fulfilling Spain's commitment to return to the same fishing Read More
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Japan and South Africa are undertaking a multi-year research plan in Statistical Subarea 48.6 as outlined in CM 41-04 (2012 & 2013). Progress achieved during the 2012/13 season is reported and achievements for the first two months of the 2013/14 season are briefly mentioned.

Over the first 14 months of the Research fishery a total of 318 Dissostichus eleganoides and 1660 Read More
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Mr Doug Cooper (Secretaría de la CCRVMA)

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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 third year of this research in 2014/15 and is to be read in conjunction with WG-SAM-14/10.

Following the Spanish research plan approved by the SC-CCAMLR XXXII, during the second year of the multi-year research survey in Divisions 58.4.1 and 58.4.2,  the F/V Tronio has returned to the same places surveyed in the 2012/13 season, as well as expanded the experience westwards to the 58.4.1D and 58.4.1C SSRUs.

A prospective estimation of the local biomass (B<sub>LOC Read More
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Submitted format for reporting finfish research proposals of the Ukraine in Subarea 48.2 in 2015.

In this document, we revise stock status assessments of D. eleginoides in research blocks C and D using CPUE analogy method, Petersen method and CASAL models following the methods recommended at the last WG-FSA meeting, although the survey for the current season has not been conducted yet. Detailed results using CASAL models in research block C are described in a separated Read More
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I made five sensitive runs of CASAL models for stock status assessments of Dissostichus eleginoides in research block C in Division 58.4.4 b on the assumption of constant year class strength and no IUU fishing occurrence in the block. The five models are as follows: 1) catch at length model as before (Len model), 2) age structured model using single age-length key (ALK) (AgeSing model Read More
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The ICES Benchmark Protocol is a review process for evaluating the data and analyses that form the basis of ICES management advice for a stock. The review examines stock structure, fishery characteristics, biological and assessment data, stock assessment and projection methodology. The review is conducted outside of the ICES annual assessment and advice environment. It includes experts from Read More
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In 2011/2012, the Saint André conducted its first exploratory fishery for Dissostichus spp. in division 58.4.3a. France notified its wish to continue this exploratory fishery over the coming years in order to achieve a robust stock assessment that would provide advice on a catch limit according to CCAMLR decision rules. This paper aims to present a research plan for 2014/2015 that Read More
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Mr Doug Cooper (Secretaría de la CCRVMA)

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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, has conducted research fishing in accordance with a research plan submitted under CM 24-01. France notifies its wish to collaborate in this research fishery over the coming years in Read More
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Mr Doug Cooper (Secretaría de la CCRVMA)

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The longline fishery for toothfish in the Ross Sea currently operates as an Olympic fishery. The number of vessels operating in the fishery has progressively increased in recent years yet overall catch limits have remained relatively stable and as a consequence the fishing opportunities for individual vessels have reduced. This report investigates recent trends in the development of the Ross Read More
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Mr Doug Cooper (Secretaría de la CCRVMA)

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The integrated modeling framework for Antarctic krill (Euphausia superba)  has been extended to include estimates of krill growth consistent with survey data and to use multi-nation survey data collected from 1981 to 2014 near the Antarctic Peninsula. Four models of the population dynamics of Antarctic krill in Subarea 48.1 based on different aggregations of the data are described to Read More
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Mr Doug Cooper (Secretaría de la CCRVMA)

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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 and 100-1,500 t Read More
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Mr Doug Cooper (Secretaría de la CCRVMA)

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Proposed Research plan for the survey of Ukrainian longliner in 48.2 subarea.

This paper presents the data and assessment approach for the revised stock assessment for Patagonian toothfish, Dissostichus eleginoides, at Heard Island and the McDonald Islands (HIMI) in CCAMLR Division 58.5.2. Since the last assessment in 2013, an extensive program for ageing otoliths has been launched, length-at-age has been re-estimated, and research into tag-recapture data has Read More
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Mr Doug Cooper (Secretaría de la CCRVMA)

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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 survey was completed in February 2012 (), and the second survey was completed in February 2013 (Parker et al. 2013). In this paper we provide preliminary results of the third survey in the time Read More
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Mr Doug Cooper (Secretaría de la CCRVMA)

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A research proposal to continue the southern Ross Sea subadult toothfish survey is presented. The survey will focus on estimating relative abundance in the core strata (A, B, C) in SSRUs 88.1 J and 88.1L. It will also carry out 15 exploratory sets in a newly defined stratum K in Terra Nova Bay. Survey timing and methods will remain the same as in previous years, and the number of sets will be Read More
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We review the stock structure of Antarctic toothfish in Statistical Area 88 with the aim of characterising the likely stock boundaries relative to stock assessments. We include information from genetic studies, otolith microchemistry, stable isotopes, tagging, size and age structure, growth dynamics, and egg and larval dispersal simulations. Taken together, the information suggests two Read More
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Mr Doug Cooper (Secretaría de la CCRVMA)

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Catch, effort, and mark-recapture data for Antarctic toothfish from individual seamount features in SSRU 88.2H were analysed to compare multiple raw indicators of biomass trends in isolated local areas. These metrics were also calculated for SSRU 88.2H as a whole. The analyses indicate that:

• Fish seldom move among seamounts within the complex, and residence time on particular Read More
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This paper frames a discussion for improving the assessment of toothfish abundance for SSRUs 88.2C–G. We initially provide a characterisation of the fishery and a summary of available tagging and length frequency data. Although more than 700 tagged fish have been released in this region, only 2 fish have been recaptured. It is likely that the lack of tag recaptures in this region has been Read More
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This paper presents further investigations of the Bayesian sex and age structured population stock assessment of Antarctic toothfish (Dissostichus mawsoni) in Subarea 88.2 covering SSRUs 88.2C, D, E, F, G, and H (SSRUs 88.2C–H). Annual age-length keys were applied, and the time trends in the tag-derived biomass index were investigated. The impact of hypothesised stock structure, fish Read More
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Mr Doug Cooper (Secretaría de la CCRVMA)

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Vessel-specific indices of tag detection rates and tagging mortality rates have been developed using a methodology which controls for the spatial and temporal variability of fishing operations by pairing each individual tag release or recapture event with all other fishing events which occurred in the same time and place (i.e. within a specific distance and in the same fishing season). The Read More
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We present an updated spatially explicit age-structured population dynamics operating model for Antarctic toothfish in the Ross Sea region, for a medium scale spatial resolution (189 spatial cells) covering the Ross Sea region. We build on the previous working medium-scale model in which the population was restricted to those cells in which at least 5% of cell area was of a depth deemed Read More
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We propose a process by which to select the version of software generally used for stock assessments in CCAMLR, with the specific example of the CASAL software used for stock assessment. The latest published version of any stock assessment software approved by CCAMLR should be used by default, unless the latest development version is necessary, in which case it is the responsibility of the Read More
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Mr Doug Cooper (Secretaría de la CCRVMA)

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Life history characteristics of Antarctic toothfish (Dissostichus mawsoni), were evaluated using otolith microchemistry techniques. Our aims were to (i) determine whether fish from in CCAMLR SSRUs 88.1C (Ross Sea) and 88.2H (Amundsen Sea), could be differentiated by the trace elemental concentrations in the otolith edge and then to (ii) assess the potential of natal signatures to Read More
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We propose a multi-year and multi-member research plan using standardised longline gear to sample the toothfish populations in the northern areas (61° - 66° S) of SSRUs 88.2A–B. The purpose of the research as requested by the Scientific Committee (SC-CAMLR XXXII, paragraph 3.76) is to characterise the local toothfish populations found there to better understand stock structure, movement Read More
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Mr Doug Cooper (Secretaría de la CCRVMA)

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This paper presents an analysis of data gained from a nine-year tagging programme of Patagonian toothfish (Dissostichus eleginoides) in Subarea 48.3. It describes the tagging procedure, the information gained about biology, growth and movement of Patagonian toothfish, and explains the overlap of tagging length distributions with those of the landed catch and survey data. The Read More
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Mr Doug Cooper (Secretaría de la CCRVMA)

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