Revised proposal for a dedicated krill survey for CCAMLR Division 58.4.1 during 2018/19 season by the Japanese survey vessel, Kaiyo-maru

A dedicated krill survey for CCAMLR Division 58.4.1 during 2018/19 season will be carried out by Japanese research vessel, Kaiyo-maru. No krill biomass has been estimated in the Division since 1996 when Australia conducted BROKE. There are two main objectives of our survey: (1) estimation of krill biomass to update B₀ in the division and (2) oceanographic observations in the area to detect long term changes if any. The krill survey (echosounder and RMT) and subsequent biomass estimation will follow the CCAMLR standard protocol. The survey is international oriented and a cumulative total of 34 researchers from 4 countries are expected to be engaged. An initial plan of the survey was presented to SG-ASAM-17 and WG-EMM-17 as SG-ASAM-17/01 and WG-EMM-17/05, respectively. A revised survey outline (SG-ASAM-18/03) and the details of narrowband (SG-ASAM-18/02) and broadband (SG-ASAM-18/05) acoustic survey methods were presented to SG-ASAM-18. The outcome of the previous discussion is reflected in this document. This revised proposal is presented to WG-EMM-18 with an intention to receive further comments from the participants. Every suggestion will be duly examined and incorporated where relevant in the final plan.