A multi-disciplinary approach incorporating otolith chemistry, age data and numerical Lagrangian particle simulations indicated a single, self-recruiting population of Antarctic toothfish (Dissostichus mawsoni) in the Southeast Pacific Basin (SPB) and Ross Sea, with a life history structured by the large-scale circulation. Chemistry deposited prior to capture along otolith edges demonstrated strong environmental heterogeneity, yet the chemistry in otolith nuclei, deposited during early life, showed no differences. Age data showed only adult fish in catches on the Pacific-Antarctic Ridge in the SPB; and structuring of life stages consistent with transport pathways from the northern Ross Sea. Lagrangian particle simulations predicted that early life stages following the flow in the SPB would be transported to areas in the Ross Sea where juveniles are caught; whereas, the circulation would facilitate adult movement along the shelf slope and back into the SPB where spawning adults are caught. These results suggest that: successfully spawning fish spend only a part of their adult life history in the Ross Sea; areas in the eastern Ross Sea contribute disproportionately to the spawning population; and areas in the southwestern Ross Sea may supply fisheries in the southern Indian Ocean.
Abstract:
In 2010, POKER Biomass survey was undertaken at Kerguelen Islands (Division 58.5.1) to collect information of all the fish species including the mackerel icefish, Champsocephalus gunnari. Data from this random stratified trawl survey, added to the previous results of 2006, was used for a short term assessment of C. gunnari on Kerguelen EEZ. The standard CCAMLR methods were used to provide potential yields for the 2010/2011 and 2011/2012 seasons even if fishery doesn’t occur presently. A catch limit tonnes was simulated till the 2011/2012 season.
Abstract:
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 of tagging. Obtained results shows that investigated area is potentially advantageous for fishing and could be recommended for exploratory fishing under CCAMLR regulations. Calculation results shows that biomass of toothfish in SSRU 88.2 A in significant and makes up from 2611.3 to 3112.3 t, which allows the removal of approximately 280 tons (at 10% operating level) each year without negative effect to the population of toothfish. We recommend 286 tons as value of limit of the allowable catch.
Abstract:
Le présent document synthétise les observations françaises en matière de pêche illicite pour l'année écoulée.
Ce rapport couvre les sous-zones statistiques 58.6, 58.5.1, 58.5.2 (qui incluent les ZEE de Crozet, Kerguelen et Heard et Mac Donald), les sous zones statistiques 58.4.3, 58.4.4 (bancs Banzare, Elan, Lena et Ob-Seamount) et la sous-zone 58.4.1. Les navires figurant sur la liste noire de la CCAMLR observés en dehors des eaux de la convention pendant cette saison y sont également mentionnés.
La ressource dans les ZEE de Kerguelen et de Crozet est aujourd’hui sauvegardée, comme le démontre le rapport de la campagne d’évaluation halieutique POKER 2 (2010). Si les prélèvements INN dans les ZEE de Crozet et de Kerguelen sont quasi-nuls, la pêche INN perdure dans les eaux internationales de la CCAMLR. Dans la zone couverte par ce document, les activités INN se sont maintenues à un niveau analogue à celui de 2011.
Le prix de vente de la légine a atteint des records cette saison, accentuant l’incitation pour la pêche INN. Ainsi, des activités INN d’une à cinq semaines sur les extensions des plateaux continentaux en dehors des ZEE sont régulièrement observées. La flottille INN s’est à nouveau principalement orientée cette saison vers les bancs Banzare et Elan (zone statistique 58.4.3) ainsi que sur des haut fonds plus disséminés (Ob et Lena seamount) et, parfois, en limite des ZEE de Crozet, Kerguelen et Heard (Lameyne Ridge, Galienni spur, William’s seamount et Del Cano rise). Des activités INN, ciblant le stock de légine antarctique, ont été observées le long des bancs du continent ou en limite des glaces, accessibles en été. Les navires observés utilisent tous le filet maillant.
Obtenir les identités des capitaines et des capitaines de pêche et connaître les nationalités des équipages des navires observés est de plus en plus difficile. On peut penser que les équipages les moins coopératifs lors des interrogations sont ceux qui comportent des ressortissants d’Etats membres de la CCAMLR. En haute mer, on constate que la présence de moyens de surveillance portant les marques de la CCAMLR n’est pas suffisante pour dissuader les navires INN de poursuivre leurs activités.
Abstract:
La France présente à la CCAMLR, dans ce document de travail, l’état de ses réflexions et de ses travaux en faveur de la création de nouvelles aires marines protégées dans ses zones économiques exclusives de Kerguelen et de Crozet ainsi que dans la zone Dumont d’Urville.
There is no abstract available for this document.
Abstract:
The present work includes results of seven-year own author’s research and presents generalised knowledge about distribution and biology of the antarctic toothfish in different sectors of the Antarctica.
Abstract:
In 2011 and 2012 in Subarea 88.3 research fishing for 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 2336 m. Total number of set hooks amounted 171096. In 2011 research fishing covered SSRU B, C and D, and in 2012 ice conditions were much worse and longlines were set only in SSRU C. Collected in research fishing data contributes to the achievement of the main objectives of research for the data-poor area: estimate of number index, evaluation of fishing capacity of Subarea 88.3, preparation of hypotheses about the ratio of fish in the area and the total stock as well as studying of biological parameters associated with productivity (SC-CCAMLR-XXX/5, par. 2.26-2.29). Toothfish's biomass was calculated by the accepted in SC-CCAMLR-XXX/5 p.2.40 (ii) formula. Value of toothfish`s stock by SSRUs and all details of stock assessment methods are described in the present work.