WG-SAM-13

Geographic Information Systems (GIS) find increasing application in different fields of modern oceanography, marine biology and fishery monitoring. The Russian Federal Research Institute of Fishery and Oceanography (VNIRO) has developed the new GIS ‘ChartMaster’ designed for processing the data provided by the fisheries oceanographic surveys. This software allows:

• to analyze Read More
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  Sarah Mackey (Secrétariat de la CCAMLR)
  
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The multi-year research plan that was adopted for the exploratory longline fishery in Statistical Subarea 48.6 and formulated in CM 41-04 (2012) is briefly summarised and progress made by Japan and South Africa during the first 6 months is presented. Two vessels participated in the fishery and so far they have concentrated their sampling effort in the southern section (south of 60˚S), where Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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The Secretariat monitors the catches of all target and by-catch species (or species groups) in CCAMLR fisheries, including catches taken from small-scale research units and other management areas where catch limits apply. Each season, approximately 130 catch limits are monitored and a linear regression forecast model is used to determine closure dates. Over the past five seasons, the Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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Notification for multi-year research in Subarea 48.5.

France has notified its intention to participate in the exploratory fishery for Dissostichus spp. in Division 58.4.3a in 2013/14. The research plan details the objectives, rationale and activities proposed for research fishing, in accordance with Conservation Measures 21-02 and 24-01.

 

Japan has notified its intention to participate in the exploratory fisheries for Dissostichus spp. in Subarea 48.6 and Divisions 58.4.1, 58.4.2 and 58.4.3a in 2013/14. The research plan details the objectives, rationale and activities proposed for research fishing, in accordance with Conservation Measures 21-02 and 24-01.



A progress report on the research fishing in Read More
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Doro Forck (Secrétariat de la CCAMLR)

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The Republic of Korea has notified its intention to participate in the exploratory fishery for Dissostichus spp. in Division 58.4.1 in 2013/14. The research plan details the objectives, rationale and activities proposed for research fishing, in accordance with Conservation Measures 21-02 and 24-01.

South Africa has notified its intention to participate in the exploratory fishery for Dissostichus spp. in Subarea 48.6 in 2013/14. The research plan details the objectives, rationale and activities proposed for research fishing, in accordance with Conservation Measures 21-02 and 24-01.



A progress report on the research fishing in Subarea 48.6 in 2012/13 was Read More
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Spain has notified its intention to participate in the exploratory fisheries for Dissostichus spp. in Divisions 58.4.1 and 58.4.2 in 2013/14. The research plan details the objectives, rationale and activities proposed for research fishing, in accordance with Conservation Measures 21-02 and 24-01.

 

Ukraine has notified its intention to participate in the exploratory fisheries for Dissostichus spp. in Subarea 48.6 and Division 58.4.1 in 2013/14. The research plan details the objectives, rationale and activities proposed for research fishing, in accordance with Conservation Measures 21-02 and 24-01.

 

Chile has submitted a notification for research fishing in Subareas 48.1 and 48.2 in 2014, 2015 and 2016 in accordance with Conservation Measure 24-01 (paragraph 3). The research will provide information on finfish distribution, abundance and size composition, with the objective of determining the current status of fish stocks in the study area. Research fishing will be limited to 100 tonnes Read More
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Doro Forck (Secrétariat de la CCAMLR)

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Ukraine has submitted a notification for research fishing over three seasons to assess the stock status of Dissostichus spp. in Subarea 48.2, starting in 2013/14. Research fishing will be limited to 80 tonnes of Dissostichus spp. in 2013/14. The notification was submitted on 30 April 2013 and in accordance with Conservation Measure 24-01 (paragraph 3).

The article is concerned with discussion of the Analysis of anomalous CPUE data from data-poor exploratory fisheries (WG-FSA-12/07). Key points of the paper were presented and discussed during the Workshop for the Analysis of the Anomalous High CPUE by Korean Vessels in the CCAMLR Area (2013,April 29th - May 1st, Busan, Korea). This paper attempts to explain possible reasons of anomalous high Read More
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Doro Forck (Secrétariat de la CCAMLR)

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Length frequency distributions (LFD) of catch collected as a random sub-sample from hauls are an important input to integrated fish stock assessments. Statistical tests for variables that significantly influence the LFD helps in evaluating how to account for important differences in availability and/or gear specific selectivity. A distribution-free model of LFD is described which is fitted to Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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The correct age-length keys are essential for the stock assessment of Dissostichus spp. by CASAL model. However, the age estimations using the otoliths have been scarcely progressed in regions of data-poor fisheries. Therefore the analysis is an urgent task. We have made five reading tests using images of thin-sectioned TOP otoliths in December 2012 and May 2013. The coefficient of Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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A survey was conducted to collect data of stock status and various biological information of toothfish in SSRUs C and D of Division 58.4.4a & b (Ob Lena Banks) from April 25 to May 22, 2013. A total of 64 research hauls using normal trotline system were made in SSRUs C and D. Total catch of Dissostichus eleginoides (excluding those tagged and released) was 31.1 tonnes in the Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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We made stock status assessments of Dissostichus eleginoides in SSRUs C and D in Division 58.4.4 a & b. Regarding SSRU C, the stock size was estimated by using following six methods; 1) comparative CPUE analysis, 2) modified Lincoln-Petersen 3) CASAL_base model, 4) CASAL_YCS_fix model, 5) CASAL_0_IUU model, and 6) CASAL_all_IUU model. This approach was made based on the WG-FSA’s Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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F/V Shinsei Maru No.3 has been engaged in Exploratory Fisheries since 2003. Furthermore the vessel has conducted research activities under CM24-01 in division 58.4.4 since 2008 and provided significant scientific information on toothfish. For the rational utilization of toothfish resources in data-poor areas, we understand that tag-recapture research plays a central role for the stock Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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Research program in data-poor Subarea 48.5 (Weddell Sea) have been carried out for the first time. New commercial and biological data on the target (Dissostichus mawsoni Norman, 1937) and by-catch species have been collected. Toothfish tagging program have been executed. Distribution of Antarctic toothfish and by-catch species by depth ranges has been investigated. Data on CPUE and Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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The stocks of toothfish in Subarea 48.4 are currently divided, for assessment purposes, into northern and southern components. The northern component is assessed as a single species of D. eleginoides whilst the southern component is assessed as a combination of D. eleginoides and D. mawsoni. Both species are caught throughout Subarea 48.4 although D. eleginoides Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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Tagging studies of skates and rays worldwide provide valuable information to help better understand a wide range of metrics including movements and migrations, stock units, growth rates, longevity, discard survival and abundance. Most Antarctic skate species are little known and, coupled with taxonomic and identification problems, this makes the tagging studies undertaken in CCAMLR area a Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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The stocks of Dissostichus mawsoni in the Division 58.4.1 were vulnerable with a big range of about 1,000-2,000 t per SSRU in Division 58.4.1. However, there is not enough data and information to assess the robust stocks and deliberate proper measurements for sustainable utilize, especially relate to diet and feeding strategy which may lead to think about ecosystem based stock Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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In the Division 58.4.1 there are two stocks of Dissostichus mawsoni, which is vulnerable with a big range of about 1,000-2,000 t per SSRU in 58.4.1. However, there is not enough data to utilize stocks properly, especially relate to reproductive mechanism. Therefore, the Korean scientists analyze the reproductive ecology of Dissostichus mawsoni in SSRU 58.4.1C-a based on the Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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In the Division 58.4.1 there are two stocks of Dissostichus mawsoni; 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. However, there is not enough data and information to assess the stocks and deliberate proper measurements for sustainable Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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The present report analyses data regarding CPUE, tagging and catch and their contribution to estimate abundance in a simple biomass dynamic model for both species of toothfish in northern area of 48.6 (SSRU 48.6A, 48.6G). Antarctic and Patagonian toothfish presented a high proportion with sets in which both species are present, and thus, an analysis of catch intention was implemented by using Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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The Spanish vessel Tronio started the research plan in the 2012/13 season using the Spanish bottom longline system. One depletion experiments was completed in each of the SSRU surveyed (58.4.1H and 58.4.1G). Three prospecting-phase clusters of sets did not reach the established threshold to start the depletion.



A prospective estimation of the local biomass (B_LOC) Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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A retrospective analysis and sensitivity evaluation of the performance of the CCAMLR harvest control rule for the mackerel icefish (Champsocephalus gunnari) in Subarea 48.3 are described. The review indicates that the approach is providing consistent, precautionary estimates of future biomass and potential catches. As required to conform to the CCAMLR objectives the harvest control Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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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 (Hanchet al. 2012a). In this paper we provide the results of the second survey in the time series.



The objectives of this second survey were: Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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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, and will conduct exploratory sets in a newly defined stratum I in southern SSRU 88.1 M. Survey timing and methods will remain the same as in previous years, although the number of sets is Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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Tag release and recapture data are used in integrated age-structured stock assessments of Antarctic toothfish (Dissostichus mawsoni) in Subareas 88.1 and 88.2 to determine abundance and sustainable yields. The assessment model assumes that all vessels have equal tag detection rates; as a consequence including observations from vessels with low detection rates (and/or low tagging Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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We present an optimised spatially explicit age-structured population dynamics operating model for Antarctic toothfish over the entire Ross Sea region, for a medium scale spatial resolution (189 spatial cells) covering the Ross Sea region.



The model was developed as a generalised Bayesian population dynamics model implemented using the Spatial Population Model software (SPM Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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Toothfish stock assessment results are strongly influenced by tag-release and tag-recapture data, and rely on the assumption that tagged and untagged fish have constant probabilities of recapture regardless of the spatial distribution of releases or subsequent fishing effort for recaptures. Conceptually this assumption implies either that tagged and untagged fish mix equally in the population Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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The Scientific Committee has provided detailed advice on the preparation and evaluation of research plans in data poor fisheries submitted under CMs 21-02 and 24-01 in 2011 and in 2012. We formulate advice arising from extensive Working Group discussions and highlight additional design and implementation issues raised during research plan design and evaluations. Our aim is to streamline the Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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

The Workshop for the Analysis on the Anomalously High CPUE by Korean Vessels in the CCAMLR Area, organized by the Ministry of Oceans and Fisheries of Korea with the assistance of the CCAMLR Secretariat, took place from April 29th to May 1st, 2013 in Busan, Korea. Key issues raised and future work suggested at the Workshop are described in the report.

As part of the Secretariat task to ensure the quality and consistency of the data arising from the CCAMLR SISO, an algorithm was designed to automatically import and check data entered by observers in their logbooks. A first version of the algorithm was tested on four randomly selected longline fishery logbooks. In its current version the algorithm is able to detect and report invalid data Read More
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Sarah Mackey (Secrétariat de la CCAMLR)

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A  preliminary characterisation of available fishing information regarding catches and effort in Divisions 58.4.4a, 58.4.4b, 58.4.3a and 58.4.3b is presented. Information analysed corresponds to fishing logbooks recorded in the exploratory fisheries carried out between July 2000 and March 2012. During this period, a total of 9 countries registered fishing operations in which 1811 sets Read More
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Doro Forck (Secrétariat de la CCAMLR)

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