Joint research proposal for the Dissostichus spp. exploratory fishery in East Antarctica (Divisions 58.4.1 and 58.4.2) by Australia, France, Japan, Republic of Korea and Spain

Exploratory fishing for toothfish (Dissostichus spp.) in East Antarctica (Divisions 58.4.1 and 58.4.2) began in 2003. Robust stock assessments and catch limits according to CCAMLR decision rules remain to be determined for these Divisions. Multiple research plans are currently in place by Australia (commenced 2015/16), France (commencing 2016/17), Japan (commencing 2016/17), Republic of Korea (commenced 2012/13) and Spain (commenced 2012/13). WG-SAM-16 welcomed plans for one consolidated research plan to be presented by all proponents of research in Divisions 58.4.1 and 58.4.2 to WG-FSA-16 (WG-SAM-16 para. 3.12). The Working Group also requested that measurable research milestones be developed to progress an assessment of toothfish stock/s in the area (WG-SAM-16 para. 3.13). We present here an updated research proposal including the research plans of Australia (WG-SAM-16/09), France (WG-SAM-16/01 & 16/02), Japan (WG-SAM-16/04 & 16/05), Republic of Korea (WG-SAM-16/17) and Spain (WG-SAM-16/10). The continuation of standardised longline surveys, in conjunction with fish tagging, biological measurements, aging and genetic approaches will be used to develop stock assessments and inform the necessary considerations of spatial structure, biomass and connectivity of toothfish populations. Environmental data from CTD (conductivity, temperature and depth) loggers, benthic video cameras (BVC) and archival tags will contribute to models of toothfish habitat use. These models will inform spatial management approaches for toothfish, and the conservation of representative areas of benthic biodiversity. Additional outcomes include improving our understanding of trophic relationships and ecosystem function through a stable isotope study; providing information on the distribution, relative abundance, and life histories of bycatch species; and mapping of the bathymetry of fishable areas.