Patagonian toothfish (Dissostichus eleginoides) are found around South America from Ecuador to Uruguay, and in the sub-Antarctic and Antarctic while Antarctic toothfish (D. mawsoni) are found closer to the Antarctic continental shelf and generally south of the Polar Frontal Zone. Data from existing tagging studies indicate that both species are generally non-migratory with the majority of individuals exhibiting strong site fidelity. Between 2006–2016 there were 111 288 Patagonian toothfish tagged and released of which 10 511 (9.4%) have been recaptured;  for Antarctic toothfish there have been 69 067 fish tagged and released of which 2 072 (3.0%) have been recaptured; the  median distance between release and recapture was  12km (max 5 708km) and 20km  (max 4 525 km) respectively. There were 210 records of Patagonian and 14 Antarctic toothfish where fish had made movements greater than 200km. Of the fish making long-distance movements 91% of D. eleginoides and 86% of D. mawsoni moved in a counter-clockwise direction around Antarctica. The low frequency of long-distance movement of toothfish between management stock units it is unlikely to adversely influence the outcomes of tag-based assessments for toothfish. However, understanding the relative scales of, and  interactions between, biological populations and management stock units for toothfish is clearly important element in CCAMLR’s  ecosystem-based approach to fisheries management.

[this is an update to WG-FSA-16/25 Rev. 1]

The first CCAMLR Scheme of International Scientific Observation workshop (WS-SISO) was held in Buenos Aires in 2017, and discussed and agreed  revisions to observer logbooks for all CCAMLR fisheries (see SC-CCAMLR-XXXVI/08). This paper summarises the proposed changes to the observer  logbooks for the longline and finfish trawl fisheries, and outlines their introduction leading up the proposed adoption for the beginning of the 2019 fishing season.

Owing to commercial fishing during the late 1970s/early 1980s, targeted notothenioid species had become depleted around the South Shetland Islands. Herein we report subsequent changes in the prevalence of three species, Notothenia rossii, Gobionotothen gibberifrons and Notothenia coriiceps in Potter Cove, King George Islands/ Isla 25 de Mayo, in a 33-year effort to monitor recovery. N. rossii and G. gibberifrons had been severely impacted by industrial fishing but in offshore waters N. coriiceps had never been commercially fished; however, all three species exhibit similar nearshore habitats and life history. We examined composition in trammel net catches during 2012–2016, augmenting a time series started in 1983. Our inshore results were consistent with those from offshore bottom trawl sampling in 2007 and 2012 around the South Shetland Islands: (1) continued increase in the  abundance of N. rossii; (2) further decline in G. gibberifrons recruitment evidenced by low proportions of juvenile fish; and (3) a high abundance of N. coriiceps. Reasons for lack of recovery in G. gibberifrons remain obscure but seemingly relate to the dramatically changing ecosystem of the region due in part to climate as well as recovery among previously depleted upper trophic level species. Our results are also consistent with trends reported in seabirds that feed on juveniles of these notothenioids: decrease in the areas commercially fished. Under the regulation of CCAMLR, commercial fishing for finfish in the South Shetland Islands region (FAO Subarea 48.1) remains prohibited since 1991; results indicate that it cannot be reinstated.

Annual report on the CCAMLR marine debris monitoring program.

La question de la taille adéquate de l'échantillon de mesure des longueurs du krill a été soulevée lors des réunions du WG-SISO-17 et du WG-EMM-17. Dans le présent document, les auteurs analysent la question au moyen une étude de cas fondée sur les données de longueurs collectées par les observateurs scientifiques à bord du navire de pêche au krill, le Fu Rong Hai, pendant la saison de pêche 2015/2016. La variation de la propriété statistique de la distribution des longueurs en fonction de différentes tailles d'échantillon a été évaluée par une simple méthode bootstrap de ré-échantillonnage. Quatre schémas typiques de la distribution des longueurs du krill ont été étudiés : unimodal, bimodal, unimodal décalé vers la gauche et unimodal décalé vers la droite. Les résultats indiquent que lorsque la taille de l'échantillon était supérieure à 100 spécimens, la moyenne et le coefficient de variance (CV) de la distribution des longueurs du krill n'étaient peut-être pas très sensibles à la taille des échantillons.