CCAMLR

In this paper we present krill density biomass estimates for Subareas 48.1, 48.2, 48.3 and 48.4 and for current fished areas, using post-hoc stratification of krill density estimates from the 2019 International Krill Survey. We highlight the importance of survey strata design for the differing areas, with implications for management. Each level of stratification requires different extrapolations from survey area to stratum area.

WG-ASAM is invited to provide recommendations on improving the repository of acoustic data collected by fishing vessels maintained by the Secretariat and to provide advice on:

• Whether the surveys listed in Annex 1 correspond to what is expected to be included in this repository.
• Whether the metadata provided in Annex 2 meet metadata requirements.
• Responsibility for data submissions and the procedures laid out in this paper.

This working group paper presents ideas and experiences regarding the use of unmanned surface vehicles (USVs) to monitor krill density in a fishing hotspot. While USVs have the advantage of reduced survey costs, reduced risk for personnel and higher data resolution in time and space, they sometimes struggle to follow straight transects and to withstand the rough weather and sea ice conditions of the Southern Ocean. We discuss commercially available technologies and outline strategies for future deployments and developments of USVs, with the goal of acquiring data that can be used to successfully manage the fishery in an adaptive context.