CCAMLR

Data on fish bycatch in the krill from Commercial catch data (95 513 hauls) and CCAMLR SISO data (11875 hauls) was used to examine the frequency of occurrence, proportion by mass, length-frequency distribution and geographic provenance of the key fish taxa reported. There was a high degree of overlap in the most frequently reported taxa in the C1 data and SISO data, with Lepidonothen larseni and Chaenodraco wilsoni the most frequently reported in both datasets. The estimated total annual mass of fish by-catch in a 300 000 t krill fishery would be 370 t, comprising 40% Champsocephalus gunnari and 30% Lepidonotothen larseni. The length-frequency distribution of all taxa for which >100 fish were measured had modal size class of <10 cm. The fish species taken as by-catch in the krill fishery are the same species (and size classes) as those reported in the diet of ‘krill-dependent’ predators. There is evidence of both an increase in the data quality from the observer scheme, as reflected in the reduced confidence intervals around the frequency of occurrence data, as well as an increase in the fish by-catch reported in the commercial krill catch data. A systematic method for observers to record fish by-catch and increases in observer coverage in the krill fishery has provided an increase in the data available with which to examine the magnitude of fish by-catch in the krill fishery.

ASOC strongly supports the recommendation of WG-EMM-16 that Conservation Measure 51-07 should be retained while alternative strategies and feedback management (FBM) are under evaluation. Discussions at WG-EMM-16 provided further evidence that concentrating krill fishing operations in areas being used by land-based predators puts predators at risk from localized depletion. Consequently, ASOC expects CCAMLR to endorse the scientific advice from its working group. Although it has some weaknesses, CM 51-07 has minimized the risks of localized krill depletion and therefore should not be allowed to lapse. ASOC also urges SC-CAMLR and the Commission to develop additional means of preventing overlap between fishing locations and predator foraging areas to minimize the risk of fishery impacts on krill predators.

A project is proposed to provide CCAMLR with a detailed description of all species which are or have been subject to exploitation at one time in the Southern Ocean. It is envisaged that CCAMLR will benefit considerably from the project both in terms of its publicity and perception in the context of international organisations.  This paper provides a brief outline of the work proposed, work priorities, possible participation, length of the project and costs incurred.

Trammel net surveys were continued in Potter Cove, South Shetland Islands, Antarctica, to achieve a 33-year record, 1983-2016, to monitor changes in the prevalence of three species of notothenioid fishes: Notothenia rossii, Gobionotothen gibberifrons and N. coriiceps. Inshore results were consistent with those achieved from the most recent offshore bottom trawl research cruises in 2007 and 2012 around the South Shetland Islands: 1) a continuous increase in the abundance of N. rossii; 2) further decline in G. gibberifrons recruitment evidenced by the low proportions of juvenile fish; and 3) a high abundance of N. coriiceps. Results were also consistent with trends in seabirds that feed on juveniles of these species. The three notothenioids have similar ecological habits nearshore, but while in offshore waters N. coriiceps was never commercially fished, N. rossii and G. gibberifrons were severely impacted by industrial fishing during the late 1970s-onset of the 1980s. Reasons for lack of recovery in G. gibberifrons remain obscure but seemingly relate to the dramatically changing ecosystem of the region due to climate and perhaps recovery of previously depleted upper trophic level species. 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.

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