WG-SAM-12

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 during most of the 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 and current system, highlight the Weddell Read More
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Sarah Mackey (Secretaría de la CCRVMA)

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In 2011 and 2012 in Subarea 88.3 research fishing of toothfish has been conducted by Russia. In 2011 fishing was carried out by Russian longliner “Sparta” out and in 2012 it was longliner “Chio Maru 3”. Research program was performed by scientific observers from VNIRO (Moscow, Russia) and YugNIRO (Kerch, Ukraine). Totally, during the work period 44 longlines were set at a depth from 625 to Read More
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Ms Doro Forck (Secretaría de la CCRVMA)

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As of the end of May 2012, four longliners conducted research fishing in the exploratory fisheries in Subareas 48.6 and Divisions 58.4.1, 58.4.2 and 58.4.3a in 2011/12 (Table 1): Hong Jin No. 701 (Korea), Koryo Maru No. 11 (South Africa), Saint André (France) and Shinsei Maru No.3 (Japan). These vessels completed a total of 267 research hauls.

There are currently two sets of requirements for reporting data from vessels conducting fishing for research purposes (i.e. research fishing): (1) research fishing conducted under Conservation Measure 24-01 (scientific research) requires that catch, effort and biological data be reported on a haul-by-haul basis using the format used by research vessels (data form C4); and (2) research fishing Read More
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Sarah Mackey (Secretaría de la CCRVMA)

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In accordance with decision of CCAMLR Scientific Committee in 2010 and in 2011 years Russian Federation was conducted research program in SSRU 88.2 A. In seasons 2010/2011 and 2011/2012 Russian vessel “Chio Maru 3” (“Antei” Ltd.) has been conducted research fishing of toothfish. The primary objective of the works in the SSRU was estimation of toothfish’s distribution density and carrying out Read More
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Ms Doro Forck (Secretaría de la CCRVMA)

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Research plan for the exploratory longline fishery for Dissostichus spp. in the 2012/13 season for Japan in Subarea 48.6 and Divisions 58.4.1, 58.4.2 and 58.4.3a.

Research plan for the exploratory longline fishery for Dissostichus spp. in 2012/13 for Korea in Division 58.4.1.

Notification for multi-year research in Subarea 48.5.

Research plan for the exploratory longline fishery for Dissostichus spp. in the 2012/13 season for South Africa in Subarea 48.6 and Divisions 58.4.2 and 58.4.3a.

Research plan for the exploratory longline fishery for Dissostichus spp. in 2012/13 for Spain in Divisions 58.4.1 and 58.4.2.

Research plan for the exploratory longline fishery for Dissostichus spp. in 2012/13 for France in Division 58.4.3a.

A survey was conducted in order to collect information for the stock status and biology of toothfish in the Division 58.4.3b (BANZARE Bank), using a commercial bottom longline vessel Shinsei Maru No. 3, from 24th May to 5th June, 2012. Due to unexpected bad weather and sea condition, the vessel and some equipments on board were frozen, the operations were delayed and the fuel oil for Read More
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Sarah Mackey (Secretaría de la CCRVMA)

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A survey was conducted in order to collect information for the stock status and various biological information on toothfish in Division 58.4.4a & b (Ob Lena Bank) by using a commercial bottom longline vessel, Shinsei Maru No. 3, from April 15 to May 19, 2012. This report described the results during the survey in two SSRUs (B & C) of Ob Lena Bank. Total catch (excluding tagged Read More
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Sarah Mackey (Secretaría de la CCRVMA)

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A tagging survey in SSRUs B and C in Division 58.4.4 a & b was conducted in the 2011/12 fishing season with the aims of providing the data required for assessments of the population structure, size, movement and growth of Dissostichus spp. in the centred area of Division 58.4.4 a & b. An approximate stock biomass level of Dissostichus spp. in the survey area was Read More
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Sarah Mackey (Secretaría de la CCRVMA)

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This work is based on material from Antarctic toothfish, collected in the Ross Sea from December 2004 to March 2005 on the longliner “Volna”.  Age was determined for 364 individuals. Currently widely applicable "the break and burn method" was used in the present work (Chilton, Beamish, 1982; Penttilla, Dery, 1988). According to the method, otolith is broken into two parts across the core Read More
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Sarah Mackey (Secretaría de la CCRVMA)

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Movement of Patagonian toothfish in Subarea 48.3 was investigated using tagging program data.  Data from 33,322 tag releases and 4,203 tag recaptures were used.

The mean movement rate of both sexes combined varied from 25 to 34 km year^-1.  There was no significant difference in movement rate between male and female fish of the same maturity category.  Male and Read More
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Sarah Mackey (Secretaría de la CCRVMA)

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In 2011 and 2012 in Subarea 88.3 Russian longliners “Sparta” and ‘Chio Maru 3” conducted research fishing for toothfish. Scientific program was carried out by scientific observers from VNIRO (Moscow, Russia) and YugNIRO (Kerch, Ukraine). Totally, during the work period 44 longlines were set at a depth from 625 to 2336 m. Total number of set hooks amounted 171096. In 2011 research fishing Read More
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Sarah Mackey (Secretaría de la CCRVMA)

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South Africa has played an active part in CCAMLR since its establishment in 1982 and has contributed to the scientific rationale for ecosystem management in a large area of the Southern oceans. Recently South Africa also initiated a new research plan within its EEZ around the Prince Edward Islands that acknowledges the objectives of the Commission for the responsible management of Antarctic Read More
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Sarah Mackey (Secretaría de la CCRVMA)

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In order to reflect the level of confidence when linking a tag recapture to a tagging event, as well as an indication of the time and effort taken to make the link, the Secretariat introduced in 2011 a tag recapture link status code.  For the 2011 season, a total of 1433 tags have been returned; 50% provide an exact match with tag numbers held in the database, 22 % provide an exact match Read More
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Sarah Mackey (Secretaría de la CCRVMA)

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Using the simplest form of an abundance estimator using tag-recapture data, the Lincoln-Petersen equation, we summarise the processes that may occur during a tagging program that lead to difficulty in accurately estimating key parameters, and consequently introduce bias into an abundance estimate. We also review the methods that have been used in CCAMLR tag recapture to program to mitigate Read More
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Ms Doro Forck (Secretaría de la CCRVMA)

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Using a modeling framework for toothfish population dynamics, fishing and data collection, this study investigated how the bias and precision of a CASAL assessment is influenced by various aspects of a tagging program, in particular the effects of the numbers of fish tagged, the duration of a tagging program, the size of tagged fish, and the type of auxiliary data used in the assessment.

Currently the target tagging rate to be achieved by vessels fishing in the CCAMLR area is set in terms of the number of fish tagged per mass of fish caught thereby mixing “units” of measure. This note questions whether it is appropriate to set the tagging targets these terms and suggests that defining the target in terms of a percentage of the number caught may be more appropriate.

Mark-recapture methodologies are commonly used to inform the management of fisheries. In addition to answering targeted research questions, tagging programmes are typically used to describe movement patterns relative to stock unit identification or to support spatial disaggregation of stock assessment areas, and in some instances to derive population abundance estimates. This paper is intended Read More
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Ms Doro Forck (Secretaría de la CCRVMA)

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CCAMLR Conservation measures currently require vessels to tag only toothfish with a high probability of survival, but no objective criteria are provided for this evaluation. Achieving this requires an objective evaluation of the probability of survival of each fish to be tagged, which in turn requires objective criteria that link observable characteristics to survival. This paper proposes Read More
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Ms Doro Forck (Secretaría de la CCRVMA)

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At its 2011 meeting, the Scientific Committee agreed that a time series of relative recruitments from a well-designed survey could be a useful input into the Ross Sea stock assessment model and endorsed a proposal to carry out this work once the fishery had closed at the end of the 2011/12 season. The first survey was successfully completed in February 2012 and the results Read More
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Sarah Mackey (Secretaría de la CCRVMA)

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At its 2011 meeting, the Scientific Committee agreed that a time series of relative recruitments from a well-designed survey could be a useful input into the Ross Sea stock assessment model and endorsed a proposal to carry out this work once the fishery had closed at the end of the 2011/12 season. The survey had two main objectives: (i) To establish the feasibility of Read More
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Sarah Mackey (Secretaría de la CCRVMA)

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A reliable commercial tagging program is critical to the successful assessment and management by CCAMLR of a number of toothfish fisheries in Antarctica. The evaluation of the tagging programme relies on two key aspects (i) that the tagged fish have a good chance of survival and (ii) that the tagged fish are reliably detected when recaptured. Previous attempts to evaluate individual vessel Read More
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Sarah Mackey (Secretaría de la CCRVMA)

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With the recognition that CCAMLR tagging programmes are used for abundance estimation of toothfish and skates, tagging operations need to be appropriately supported through documentation, training, and supplies. This paper reviews how tagging programme information could be effectively organised, provides a template training module for observers and vessel crew, and makes recommendations to Read More
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Ms Doro Forck (Secretaría de la CCRVMA)

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A Tagging Program for Patagonian toothfish in the longline Argentine fishery outside CCAMLR´s waters was implemented. It was designed to study specific characteristics of the movement and migration of Patagonian toothfish in order to increase biological knowledge on the species and improve resource management in the South-Western Atlantic Ocean. The program started in 2004 and some 4900 Read More
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Sarah Mackey (Secretaría de la CCRVMA)

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We analysed the available data from vessel and scientific observer logbooks from the exploratory fishery for Antarctic toothfish (Dissostichus mawsoni) and Patagonian toothfish (D. eleginoides) in CCAMLR subarea 48.6 (South East Atlantic). This report summarises the catch, effort, timing, depth, location, size structure and maturity of Dissostichus spp.   Read More
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Sarah Mackey (Secretaría de la CCRVMA)

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