WG-SAM-11

At CCAMLR-XXIX, the Commission recommended that a staffing and salary strategy be included in the review of the Secretariat’s Strategic Plan and that SCAF consider the outcomes of that review at its meeting in 2011 (CCAMLR-XXIX, paragraph 3.5 and 3.10). In addition, following consideration at last year’s meetings of WG-SAM and WG-FSA the Commission adopted a recommendation from the Read More
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The data of krill fishery in Subarea 48 for 1986 – 2008 presented to CAMLR database by haul-by-haul data were used. Standardizing CPUE was performed by applying the generalized linear model with random effects (GLMM). The analysis of diagnostics of GLMM tuning indicated that the model with Tweedie’s distribution satisfactorily describes the set of data collected in Subareas 48.1, 48.2 and 48.3 Read More
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In November 2010, the Secretariat allocated 1405 random starting positions for research hauls in order to facilitate research fishing by seven vessels which had notified their intention to participate in exploratory fisheries for Dissostichus spp. in Subarea 48.6 and Divisions 58.4.1, 58.4.2 and 58.4.3a in 2010/11. The positions were allocated in accordance with Conservation Measure Read More
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In accordance with the Conservation Measure 41-07 (2010), a survey was conducted in order to collect information for the stock status and biology of toothfish in the southeast sector (24 allocated hauls) of Division 58.4.3b (BANZARE Bank), using a commercial bottom longline vessel Shinsei Maru No. 3, from May 7 to 16, 2011. Shinsei Maru Trot line system was used as fishing gear for 19 hauls Read More
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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 March 30 to May 2, 2011. The survey was undertaken according to the decision in the 29th CCAMLR Meeting of the Commission (CCAMLR-XXIX, 2010; paragraph 4.62 Read More
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A tagging survey in SSRUs B and C in Division 58.4.4 a & b was initiated in the 2010/11 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 centered area of Division 58.4.4 a & b. In the 2010/11 a total of 189 D. eleginoides were tagged and released in SSRUs B Read More
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Since 1992, CCAMLR has agreed that exploratory fishing is not to be allowed to expand faster than the acquisition of information necessary to ensure that the fishery can and will be conducted in accordance with the principles set forth in Article II of the Convention. However, several times over the last five years the Scientific Committee has noted with concern the lack of progress in Read More
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According to the application that has been applied by Russian Federation in 2010 for season 2010/2011 research fishing in subarea 88.3 has been done. The work has been done by longliner “Sparta”, with two scientific observers aboard. They deployed 20 sets (trotline) at different depths. Total amount of set hooks is 87096. Research catching was carried out in SSRU B, C, and D. In SSRU A sets Read More
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The model of tag shedding implicit in CASAL is that of Kirkwood and Walker (KW) (1984) which models the annual tag shedding (i.e. loss) rate as a constant for individual tags. The CASAL software applies this model correctly for fish released with a single tag but does not have the facility at present to correctly apply the KW model for fish released with two tags. The solution of Dunn et al Read More
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A generic spatially-explicit age-structured model framework is in development that will enable to evaluate data collection protocols, assessment methods and management strategies. The model framework is programmed in R to promote transparency and interactions between researchers. It is based on the FLR framework and will incorporate links to external assessments programs such as CASAL. The Read More
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This paper presents the updates to the CCAMLR tagging database in relation to tag recapture links, and the problems associated with linking tags.

 

The potential for data poor exploratory fisheries in the CAMLR Convention area to provide sufficient data to lead to formal stock assessments of Dissostichus spp. is evaluated and recommendations are made for optimizing this potential.  The types of data that have led to successful assessments in the past are reviewed. Exploratory fisheries and research questions for subareas Read More
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The exploratory fishery for Dissostichus spp. has now been operating for 14 years in Subarea 88.1 and for nine years in Subarea 88.2. Associated research has led to an assessment of the fisheries potential yield, but a source of ongoing uncertainty in the stock assessment concerns recruitment dynamics. Although pre-recruit Antarctic toothfish fish are caught in various locations Read More
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Antarctic and Patagonian toothfish stocks in the Antarctic have been assessed within CCAMLR areas using integrated statistical catch-at-age stock assessment models. These models were initially run annually, but have been run biennially since 2007. This document investigates the impact on model outputs of withholding from a stock assessment between one and eight years of age frequency and/or Read More
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The rate at which tags are lost from tagged toothfish is an important parameter in modelling of the Antarctic toothfish (Dissostichus mawsoni) populations in Subarea 88.1 and 88.2. The toothfish stocks in these areas have been assessed using data from tag-release and recapture experiments within a CASAL integrated stock assessment model, using tag loss rates derived by Dunn et al. ( Read More
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Exploratory research voyage of F/V 'TAMANGO' proceeded from March, 23 to May, 8, 2010. Three areas were explored during the voyage: Patagonian shelf (Statistic Subarea 41.3.1), South Orkney Islands shelf (CCAMLR Subarea 48.2) and the North Scotia Ridge. Exploratory pot-line survey revealed no commercial concentrations of crabs on the South Orkney Islands shelf. However, commercial Read More
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The Kerguelen Plateau (Statistical Divisions 58.51 and 58.5.2) supports the largest Patagonian toothfish (Dissostichus eleginoides) fishery in the Southern Ocean outside of the Atlantic sector. Analysis of genetic, demographic and tagging data indicates that toothfish form a metapopulation in this region. This paper describes the development of a CASAL model incorporating data from Read More
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The Magnuson-Stevens Fishery Conservation and Management Reauthorization Act of 2006 requires Regional Fishery Management Councils to set annual catch limits for all stocks or stock complexes in Federal fishery management plans beginning in 2011. Most species listed in the Pacific Coast Groundfish Fishery Management Plan have not been assessed, in large part due to data limitations. Read More
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Публикация:
(NOAA-TM-NMFS-SWFSC-460 (2010))

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We describe a method for determining reasonable yield and management reference points for data-poor fisheries in cases where approximate catches are known from the beginning of exploitation. The method, called Depletion-Based Stock Reduction Analysis (DB-SRA), merges stochastic Stock-Reduction Analysis with Depletion-Corrected Average Catch. Data requirements include estimates of historical Read More
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Публикация:
(Fish. Res. (2011), in press, doi:10.1016/j.fishres.2011.05.007)

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The depletion-corrected average catch (DCAC) formula is an extension of the potential-yield formula, and it provides useful estimates of sustainable yield for data-poor fisheries on long-lived species. Over an extended period (e.g. a decade or more), the catch is divided into a sustainable yield component and an unsustainable “windfall” component associated with a one-time reduction in stock Read More
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Публикация:
(ICES J. Mar. Sci. (2009), 66: 2267–2271)

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