WG-FSA-11

Macroscopic data of the field research obtained during fishing trips on board Spanish longliner "Tronio" in 2007-2011 were given. Gonadosomatic indices (GSI) of 823 Antarctic toothfish individuals from various SSRU in the Ross Sea were calculated. For one specimen with maximum observed weight of gonads (15.5 kg, GSI – 23.85 %), the individual absolute fecundity (IAF) and relative fecundity (RF Read More
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The fish sampling protocol (K12 form) was developed to ensure that small/larval fish, that  may go undetected in larger samples, are recorded using a sorting method with a standard sub-sampling approach that allows the user to re-sort smaller samples and maximises potential to detect by-catch.

This paper uses data collected using the fish sampling protocol (K12) during 2010 and Read More
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In order to assess the level of confidence in the link made, as well as the time and effort  taken to make the link, the Secretariat introduced a tag recapture link status code to identify the level of effort involved in linking a tag recapture to its tagging event.  For the 2011 season 673 tags have been returned;  37% provide an exact match with tag numbers  held in the Read More
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The Secretariat contacted 14 Members in January 2011 providing them with a table listing the

number of otoliths collected on each trip by a vessel flagged to that Member and the observer

responsible for collecting the otoliths on that trip. Members were asked to provide information

on the storage location and number of otoliths aged. Responses were received from 9 Read More
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Summary of fishery-related information for WG-FSA including availability of data, catches of target and by-catch species in assessed and exploratory fisheries, tagging rates and the tag overlap statistic, notifications (fisheries, research and VMEs), development of species profiles and findings of the review of CCAMLR’s data management systems. Where applicable, the 2011 draft fishery Read More
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This paper summarises recent, fishery-related scientific research notified in accordance with Conservation Measure 24-01. Four notifications were received by the Secretariat for research in 2010/11, and five notifications have been received to date for research in 2011/12.

At CCAMLR-XXIX the Scientific Committee requested that the Secretariat monitor trends in IUU effort rather than estimate IUU catch (SC-CAMLR-XXIX paragraph 6.5). The Secretariat has prepared a summary of reported IUU fishing activity in the Convention Area during the 2010/11 fishing season

Whale observation data was collected abroad polish trawler Dalmor II that fished Antarctic krill in the CCAMLR statistical area 48. Observation details, group size, behavioral specific details were fixed. Also photo material was collected. There were 50 sightings of at least 280 individuals from March to July 2011. Vast majority sightings (90%) were minke whales (Balaenoptera bonaerensis Read More
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The vessel Simeiz carried out Patagonian toothfish (Dissostichus eleginoides) fishery in the southwestern Atlantic Ocean beyond EEZ from January till August 2011 in statistical divisions 41.3.1 and 41.3.2.

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. Comparison test using trotline and Spanish line 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. This report described the results during the survey in two SSRUs (B & C) of Ob Lena Bank. Total catch (excluding fish 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 centred area of Division 58.4.4 a & b. An approximate stock biomass level of Dissostichus spp. in the survey area (SSRUs B and C Read More
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Preliminary studies on the age, growth and size at sexual maturity of Dissostichus eleginoides sampled in the 2007/08 season in the Ob-Lena Bank were carried out. The ages of 214 of 3,013 fish sampled by Observers were estimated last year. Then, we took several advice and comments about the methods of otolith readings by experienced readers of AAD. One of these is that the first Read More
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In 2010, two toothfish species, Patagonian (D. eliginoides) and Antarctic (D.mawsoni) toothfish, were registered during the fishery on Dissosyichus spp. on the shelf edge and slope of Bouvet Island. Their commercial concentrations were found also on the neighboring underwater plateaus surrounding the island. The vertical distribution of two species was Read More
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The present paper presents the brief results of the research in reproductive biology of the Antarctic greinadier M. whitsoni in the Ross Sea. It was stated that the eggs were released by batches. It was supposed that the similar character of spawning might be for some other Antarctic fish species. Some peculiar features of the reproductive biology Moray cod M. evseenkoi, Read More
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We used stable isotope and trace element chemistry from otoliths to test whether silverfish (Pleuragramma antarcticum) are distributed in independent, discrete populations in the Ross Sea, over the West Antarctic Peninsula, and around the South Orkneys; or whether the Southern Ocean circulation leads to connectivity. Otolith chemistry showed strong heterogeneity indicating four 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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An investigation into use the length-weight relationship of Dissostichus eleginoides and D. mawsoni to separate the two species was undertaken using data from the CCAMLR Scheme of Scientific Observation. Although the ability to discriminate the two species using length and weight measurement was inconclusive the process provided an opportunity to examine the variation in Read More
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Surveys of mackerel icefish, Champsocephalus gunnari, was undertaken in Division 58.5.2 in the vicinity of Heard Island during September 2010 and April 2011, to provide information on the population dynamics of this species, and to provide a basis for an assessment of short-term annual yield in the 2011/2012 CCAMLR season. This paper provides a preliminary assessment of yield for Read More
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Random stratified trawl surveys were completed in September 2010 and in March to May 2011 on the RV Southern Champion, adding to the time series of annual surveys in Division 58.5.2 that commenced in 1997. An earlier survey in April 2010 was not completed, but valid hauls from this, as well as the September 2010 survey were used in the stock assessment as they provided valuable Read More
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The integrated assessment of Patagonian toothfish, Dissostichus eleginoides, for the Heard and McDonald Islands (Division 58.5.2) was updated from WG-FSA-09/20. The main change other than updating total removals by sub-fishery and updating catch-at-age and catch-at-length proportions was the inclusion of random stratified trawl survey (RSTS) abundance-at-age for 2010 and 2011 and Read More
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This paper summarises the data collection requirements for the exploratory fisheries for Dissostichus spp. and the general characteristics of the research hauls which may assist WG-FSA to determine the extent to which the available data may be used in developing assessments for these fisheries.

This paper summarises the data collection requirements for the exploratory fisheries for Dissostichus spp. and the general characteristics of the research hauls which may assist WG-FSA to determine the extent to which the available data may be used in developing assessments for these fisheries.

Results of comparative histological analysis of gonads of female and male Antarctic toothfish Dissostichus mawsoni caught by Russian longliners in the Ross Ross Sea of the Pacific sector in 2004/2005 - 2006/2007 seasons are presented. Morphological indices of females and males, age, indices of gonads, fecundity, and condition by Fulton are described. The criteria of assessment of Read More
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A stock assessment of the Patagonian toothfish (Dissostichus eleginoides) at Kerguelen Island (division 58.5.1 of the CCAMLR) was undertaken with the modeling software CASAL, using different statistical and biological datasets: abundance estimation from the POKER 1 and 2 scientific cruises, catch per unit effort of the commercial fishery, tagging survey, sample size frequencies… Read More
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The 2011 groundfish survey took place at South Georgia and Shag Rocks on the FV Sil between the 27th January and 6th February 2011. 87 random hauls were completed, with good coverage across the shelf. Catch-weighted length frequencies of mackerel icefish indicated that 3+ sized fish dominated at Shag Rocks, however 1+ and 2+ sized fish were present in larger proportions at South Read More
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A length-based projection model is used to estimate catch limits for the 2011/12 fishing season for Champsocephalus gunnari in CCAMLR sub area 48.3. The model is initialised using estimated numbers at length derived from survey length density and biomass density data, removing the need for cohort identification associated with age based projection models used historically. Read More
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A three-year tagging experiment was initiated by the UK in 2008/09 fishing season with the aims of providing the data required for assessments of the population structure, size, movement and growth of both Patagonian toothfish (Dissostichus eleginoides) and Antarctic tooth (Dissostichus mawsoni) in South of Statistical Subarea 48.4. This paper presents the results for D Read More
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The Ross Sea toothfish fishery in Subarea 88.1 and 88.2A&B has been classified by CCAMLR as an exploratory fishery since 1998.  The current classification of this fishery as ‘exploratory’ has led to the widespread misconception that little information is available for this stock, and that a rigorous assessment of the stock status and estimation of long-term precautionary yield has Read More
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As with the 2009 assessment of Subarea 48.3, there is still uncertainty as to why there were high numbers of the 2001 cohort in commercial catches in 2009 onwards.  It is likely that it is due to a combination of a strong 2001 cohort and a change in selectivity for the commercial fleet, but it has not been possible to determine the relative importance of each explanation.

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Large fluctuations in abundance are a persistent feature of the populations of mackerel icefish (Champsocephalus gunnari) in the waters adjacent to Heard Island and the McDonald Islands in CCAMLR Statistical Division 58.5.2. The current decision rules for setting catch limits for icefish theoretically allow some commercial fishing to occur on icefish stocks when stock biomass is at Read More
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The exploratory longline fisheries in Divisions 58.4.1 and 58.4.2 (primarily targeting D. mawsoni) have been operating since 2003. Formal stock assessments have yet to be developed for these fisheries. Analyses of C2 catch rate and mean weight data from 2484 longline hauls conducted between 2003 and 2011 enabled the development of generalised additive mixed models that were then Read More
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In accordance with decision of SC-CCAMLR in 2010, the Russian Federation conducted research fishery on toothfish in Subarea 88.3 in the season 2010/11. The researches were carried out onboard longliner Sparta (company “Morskoi Voron”). In total, 20 trotline sets at different depths have been made, the total number of exposed hooks being 87,096. The research program covered SSRU B, C Read More
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In this paper we update the assessment of D. eleginoides in the northern half of Subarea 48.4 presented in 2010. The CASAL model is improved through the incorporation catch at age data, as an alternative to the catch at length data that were the only such data available in 2010. The catch at age model generates a yield of 52 tonnes based on CCAMLR decision rules.

In 2006 Read More
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Difficulties in distinguishing between certain gonad stages is of common concern for observers onboard vessels fishing for Dissostichus eleginoides. To minimise errors in interpretation of maturity scales of D. eleginoides a comprehensive identification guide has been prepared. It is proposed that this guide forms part of the CCAMLR observer manual.  

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This paper outlines a proposal to develop a field guide for Antarctic fishes which  would use photographs of live fish wherever possible.

359 Antarctic krill catches were analysed for by-catch, it took 48.5% of observed catches and 31.3% of total catches. Fish by-catches were usual in the sector 48.1 (89.1% of cases); the most of by-caught fishes belonged to families Nototheniidae (NOX) (66.3%). Fish by-catches in the sector 48.2 were recorded in 50% examined catches; the most frequent were fishes of families Myctophidae (LXX Read More
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We provide an update of the Bayesian sex and age structured population stock assessment model for Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea region (Subareas 88.1 and SSRUs 88.2A–B), using revised catch, catch-at-age, and tag-recapture data for the 2010–2011 seasons. The 2011 reference model using the selected trips tag data gave a similar, but slightly higher Read More
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This paper describes the first Bayesian sex and age structured population stock assessment model of Antarctic toothfish (Dissostichus mawsoni) in Subarea 88.2 covering SSRUs 88.2C, D, E, F, and G (SSRUs 88.2C–G). For modelling purpose, we split the region into two fisheries: south of 70.2° S where smaller fish are typically caught and effort has been light; and north of 70.2° S Read More
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We provide an update of the Bayesian sex and age structured population stock assessment model for Antarctic toothfish (Dissostichus mawsoni) in the SSRU 88.2E, using revised catch, catch-at-age and tag-recapture data from selected trips and all vessel trips. The 2011 reference case model resulted in a 30% higher estimate of initial biomass than for the 2009 base case. The main Read More
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The exploratory fishery for Dissostichus spp. has now been operating for fifteen years in Subarea 88.1 and for ten years in Subarea 88.2. This report summarises the timing, depth, and location of fishing together with the catch of Dissostichus spp. and bycatch species by year for the period 1997–98 to 2010–11. During the 2010–11 fishing year most of the catch in Subarea 88. Read More
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Descriptive analyses of the toothfish tagging programme in Subareas 88.1 and 88.2 are updated, including summaries of data for the 2011 season. Overall, a total of 28 458 Antarctic toothfish have been reported as released and 1417 recaptured, and 1124 Patagonian toothfish released and 67 recaptured since 2001. In recent years, most vessels have achieved or exceeded the target tagging rate of Read More
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At its 2010 meeting, the Scientific Committee agreed that a time series of recruitments from a well- designed survey in the Ross Sea could be a useful input into the stock assessment model and requested members develop a pre-recruit survey design. A preliminary proposal for a pre-recruit survey was presented to the 2011 meeting of WG-SAM. In this paper we provide an update of the preliminary Read More
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Stock assessments rely upon estimates of the total mortality resulting from fishing activities. The level of mortality resulting from the loss of sections of bottom longline gear in the Ross Sea region and Subarea 88.2 Antarctic toothfish (Dissostichus mawsoni) fisheries is not currently known. Lost fishing gear should be monitored to provide information to evaluate how well CCAMLR Read More
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New Zealand will deploy four pop-off satellite transmitters on Antarctic toothfish along the Ross Sea continental slope in January 2012. They will be programmed to pop-off the fish, float to the surface, and transmit in December 2012. The purpose of this paper is to provide an announcement for members to distribute to vessels, crew and observers given the chance that these fish may be Read More
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The background to the current CCAMLR toothfish tagging programme is reviewed and recent performance measures implemented by CCAMLR to control and monitor the tagging of toothfish (Dissostichus species) in exploratory fisheries carried out within the Convention Area are described.  Following the first season of implementation we describe several circumstances which will cause Read More
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Software is presented for the automated production of standardised image plots of spatially referenced bottom fishing impact assessments. This software is submitted to WG-FSA to assist the Secretariat or CCAMLR Working Groups in the production of integrated bottom fishing impact assessments, including routine update of the circumpolar impact assessment originally described in SC-CAMLR-XXIX/4 Read More
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South Africans have been deployed as CCAMLR observers on vessels from a number of flag states. In some cases the observers have retained the otoliths that were collected and deposited them at the Branch Fisheries Management, Dept Agriculture, Forestry and Fisheries (DAFF) in Cape Town. As a result, South Africa holds otoliths collected from the CCAMLR area by vessels from five different flag Read More
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Although Spanish longline has been used in CCAMLR fisheries for a number of years, detailed information on the fishing gear and the procedures for setting/hauling has not been described in detail and is not currently included the CCAMLR gear library. In order to contribute to the assessment of potential adverse impact on VMEs and on incidental mortality of seabirds by Spanish longlines, this Read More
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The Korean flagged bottom longliners, “Jung Woo No. 2” and “Jung Woo No. 3”, have participated in the exploratory fishery from 1st Dec 2010 to 10th Jan 2011 for Dissostichus spp. The fisheries took place in subarea 88.1 BCJL. During their activities, the vessels gathered scientific information on Dissostichus spp. and by-catch such as their distribution, size, sex, weight, etc. This Read More
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Patagonian toothfish (Dissostichus eleginoides) or "Chilean sea bass" support a valuable and

controversial fishery, yet their life history is not well understood and longevity estimates

range from approximately 20 to more than 50 years. In this study, lead-radium dating

provided valid ages for juvenile to older adult groups, which were consistent with the Read More
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Publication:
(Marine and Freshwater Research, 62(2011): 781–789)

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In 2010 on the southern slope of Bouvet Island, I found L. kempi at still greater depth in the course of fishery for toothfish onboard of 1 Insung Korean longliner. In the first case, mature specimens with absolute length (TL) of 39–45 cm and weight of 0.8–1.3 kg

were found in stomachs of Antarctic toothfish caught at depths of 1500–1900 m. In the second case at 54°32′7 S and 03°46′ Read More
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Publication:
(J. Ichthyol., 51 (8) (2011): 683–685)

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The diet of Antarctic toothfish (Dissostichus mawsoni) and Patagonian toothfish (D. eleginoides) was examined around the south sandwich islands in the southern ocean, one of few regions with overlapping populations of the two species. Despite large differences in the proportion of stomachs containing prey (76.2 % of D. mawsoni compared to 7.2 % of D. Read More
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Publication:
(J. Fish Biol., 79 (2011: 138–154)

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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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