Following discussion at the Scientific Committee in 2016, we propose a process for independent review of CCAMLR integrated toothfish stock assessments based on the process used by the Center for Independent Experts (CIE, NOAA), and the benchmarking process used by ICES.

The Southern Ocean Observing System (SOOS) has developed a number of networks and products of importance to the work of CCAMLR. Through this paper, SOOS seeks to update SC-CCAMLR on this progress and invite collaboration towards delivery of networks and tools that will benefit both communities. SOOS encourages CCAMLR delegates to communicate with, and be involved in the SOOS regional networks that are coordinating and enhancing observational data collection and delivery. SOOS invites CCAMLR to contribute directly to the Database of Upcoming Expeditions to the Southern Ocean to facilitate international scientific collaboration. Further, SOOS requests input from SC-CCAMLR on the “SOOSmap” data discovery tool, including discussions on key data layers of interest to, and potentially provided by CCAMLR. These requests will form the foundation for discussions at the proposed joint workshop between SOOS and SC-CCAMLR (SC-CAMLR-XXXVI/BG/15).

This paper presents the latest developments in models for Crozet following the more recent ones (Sinègre & Duhamel, 2016) with an updating of input data from the more recent years (up to 2016/17 season) and a reassessment of stocks taking into account the previous remarks of the WG-FSA meetings.

This paper presents the latest developments in model of Kerguelen with an updating of input data from the more recent years (up to 2016/17 season) and a reassessment of stocks taking into account the previous remarks of the WG-FSA meetings.

In 2017, a bottom trawl survey (PoKer 4) was undertaken at Kerguelen Islands (Division 58.5.1) to collect information about the size distribution and the biomass status of mackerel icefish, Champsocephalus gunnari. Data from this random stratified trawl survey was used for a short term assessment of C. gunnari on Kerguelen EEZ. The standard CCAMLR methods were used to provide potential yields, a catch limit of 3081 t is recommended for 2017/2018 and 2753 t for 2018/2019.

The indices of exploratory toothfish fishery in the Subareas 881 and 88.2 for the period of 2010-2016 are considered. Taking into account the different number of hooks at longlines sets used at the fishery, the catch indices were normalized to 1000 hooks.  The effect of the gear types (autoline, spanish, trotline) on the observed spatial-temporal variability of CPUE toothfish (kg/1000 hooks), by-catch CPUE (kg/1000 hooks) and normalized target catch ratio is considered. Particular attention was focused to the analysis of the length-species compositions of catch by years and SSRU while using different types of longlines. Our results  show that the gear type  is the most important factor that must be taken into account both during the longline fishery data analysis and the research programs planning.

Electron subantarctic (Electrona carlsbergi) is one of important pelagic myctophidae which circumpolar distributed between the warm waters of the subtropical confluence zone and the Southern Ocean. The distribution, life history and migration pattern of this species were examined using the biological data in 1990s, however, the habitat shift of this species was still unclear. The present study examined Sr:Ca ratio of otolith section for E. carlsbergi from nucleus region to edge and validated the habitat shift of this species using otolith elemental signature analysis. Otolith samples were collected from northern South Shetland Islands during January 2010 (9 individuals), January 2013 (5 individuals) and February 2016 (9 individuals) from krill fishery, respectively. The results demonstrate E. carlsbergi hatched in two different areas, E. carlsbergi with Type I otolith could hatched in the oceanic waters of sub-Antarctic zone and spend the first year of life in this region. Those individuals move across different fronts into the Antarctic waters from the warmer waters after age 1. E. carlsbergi with Type II otolith could hatched in the coastal waters and are transported (or moved positively) across sub-Antarctic Front into the open waters (oceanic regions of APFZ) with the influence of eastward movement of strong ACC system. The present study reveals otolith elemental signature analysis can be used to test habitat shift and life history processes of fish species in the Southern Ocean. Moreover, otolith elemental signature analysis with coupling to water chemistry can be useful to ascertain migration routes of E. carlsbergi.