WG-SAM-10

ABSTRACT
Prior to the 2009/10 fishing season, the Secretariat allocated starting positions for research hauls in the exploratory fisheries in Subareas 48.6 and 58.4 (except on BANZARE Bank were positions were specified in Conservation Measure 41-07). For each of the 12 notifying vessels, up to 8 starting positions were provided for each stratum in each SSRU notified, and vessels were Read More
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Admin Admin (Secrétariat de la CCAMLR)

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ABSTRACT
Two new procedures are currently been developed by the Secretariat to further improve data quality: (1) validation of species’ spatial distributions; and (2) visualisation of data from single fishing trips. Both procedures are outlined.

The task to estimate the escape mortality of krill during the fishing operation assigned by Scientific Committee requires assessment of the total krill passed through the rope and netting parts of trawl and krill amount appeared unviable in the process of escapement. The recommendations presented are the first attempt to develop the method of instrumental assessment of the «escape mortality». Read More
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Admin Admin (Secrétariat de la CCAMLR)

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ABSTRACT Applicability of geostatistical methods in processing the acoustic fields of krill density based on the acoustic survey data is demonstrated. The results obtained indicate usefulness of these methods in studying the structure of krill density field for biomass assessment in compliance with different thresholds of their fishery importance. The structure of krill density field in Read More
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Admin Admin (Secrétariat de la CCAMLR)

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1. The Secretariat manages a comprehensive, detailed set of independent or related databases which support the work of the Commission and give effect to Article XX of the CAMLR Convention. Since the establishment of CCAMLR 28 years ago, there has been no formal, in-depth audit of the Secretariat’s data management systems against international best practice. 2. The Working Group is invited to Read More
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Admin Admin (Secrétariat de la CCAMLR)

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Version 2 of Patch is available. Patch is a simulation program in R for evaluating spatial management strategies to conserve structure and function of ecosystems. Patch has been defined specifically for evaluating strategies to manage bottom fisheries to avoid significant adverse impacts on vulnerable marine ecosystems. This paper includes the revised manual for Patch, which describes its Read More
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Attempts to estimate natural mortality, as a single constant M, simultaneously with other model parameters in integrated assessments via CASAL for the Heard and McDonald Islands (HIMI, CCAMLR Division 58.5.2) Patagonian toothfish (Dissostichus eleginoides) fishery have been unsuccessful. An alternative estimation strategy was tested using simulation whereby catch-at-age and aged mark- Read More
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Admin Admin (Secrétariat de la CCAMLR)

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An age-based operating model was constructed and used to derive an initial numbers at age vector for the population. An age-based harvest control rule was then applied using the operating model dynamics and assuming perfect knowledge of the resource (initial numbers at age, maturity and weight at age). The initial numbers at age was also converted to numbers at length, which was used to Read More
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In accordance with the Conservation Measure 41-07 (2009), a survey was conducted in order to collect information for the stock status and biological information on toothfish in the southeast sector (24 allocated points) of Division 58.4.3b (Banzare Bank), using a commercial bottom longline vessel Shinsei Maru No. 3, from December 1 to 13, 2009. Shinsei Maru Trot line system 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 April 30 to June 20. The survey was undertaken according to the decision in the 28th CCAMLR Meeting of the Commission (28th CCAMLR report paragraph 4 Read More
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In order to clarify the stock status and biological characteristics of Dissostichus spp. In Division 58.4.4 a & b, we submit this research plan for toothfish in the Division by Shinsei Maru No. 3 to be conducted in April-June 2011. This is the second year of the survey of the 3-5 years consecutive research focusing on tagging program, recommended by WG-SAM-09 in this Read More
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Distribution, relationship between sizes and depths, sex ratio, size composition and maturity condition for Dissostichus eleginoides and D. mawsoni were investigated on Banzare Bank, using the biological data sampled by a Japanese commercial fishing vessel during austral summer from 2006/07 to 2008/09 fishing season. D. eleginoides was mainly caught in the shallower Read More
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Admin Admin (Secrétariat de la CCAMLR)

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Sources of variability of krill mean length and fish bycatch number was investigated to explore proper allocation of scientific observers on Japanese krill fishing vessels using the data from 1995 to 2008. Based on the multistage sampling theory, we derived the equation of variance in four stage cluster sampling units (i.e., vessel, year, subarea, and haul), and examined changes in the Read More
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Admin Admin (Secrétariat de la CCAMLR)

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Bathymetric data are currently used inter alia to define management boundaries, implement conservation measures, allocate catch among areas, estimate spatial impacts due to fishing, and inform ecosystem-based management through bioregionalisation. Several data sources for bathymetric data exist, and these sources improve with time through additional data collection and improved analytical Read More
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An important management objective for CCAMLR in the high seas region of the Antarctic is to develop appropriate methods of monitoring and managing impacts of bottom fisheries on vulnerable marine ecosystems (VMEs). We describe a spatially explicit production model that can be used to investigate a range of simple scenarios for simulating the effect and management of benthic impacts from Read More
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Admin Admin (Secrétariat de la CCAMLR)

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In 2008-2009 New Zealand developed an impact assessment framework to estimate the likely impacts of bottom longline fishing on vulnerable benthic invertebrate taxa, termed Vulnerable Marine Ecosystems (VMEs), consistent with the requirements of Conservation Measure 22-06 (Bottom fishing in the Convention area). The impact assessment framework was subsequently endorsed within CCAMLR for routine Read More
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We report on progress towards developing a Minimum Realistic Model for investigating trophic relationships between Antarctic toothfish (Dissostichus mawsoni) and four groups of demersal fish in the Ross Sea, Antarctica. These demersal fish are known to form a part (in some cases a substantial part) of the diet of Antarctic toothfish of a size commonly taken by the Ross Sea fishery and Read More
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Software is presented for the automated production of standardised image plots of spatially referenced data. While developed to satisfy the specific requirements of WG-FSA, the routines have been developed to be as generic as possible and may be useful for displaying a wide range of data. This software is submitted to be appraised by WG-SAM in the hope it may prove a useful tool within CCAMLR Read More
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Data on the main population of black petrel (Procellaria parkinsoni), which breeds on Great Barrier Island, were analysed. Three types of data were available. The most useful was abundance data, from which it was possible to infer that the population was probably increasing at a rate between 1.2% and 3.1% per year. Mark-recapture data were useful in estimating demographic parameters, Read More
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Admin Admin (Secrétariat de la CCAMLR)

Publication:
(New Zealand Aquatic Environment and Biodiversity Report, 51 (2010), ISSN 1176-9440)

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