CCAMLR

The Ross Sea shelf survey has been conducted annually since 2012, with the most recent revised proposal presented in 2017 and spanning five years (2018–2022). This paper:

• serves as notification for the 2022 survey under CM 24-01 following the survey design proposed in WG-SAM-17/39, and annual notifications in WG-FSA-18/41, WG-SAM-19/03, SC-CAMLR-39-BG-03.
• fulfils the requirement for a self-assessment of research proposals,
• provides updated information needed for CM 24-05,
• updates the milestone achievement table.

A research plan for Subarea 88.3 was commenced by Korea in 2016 under CM 24-01, New Zealand joined the proposal in 2017. The joint research proposal was for 3 years covering the period 2017/18, 2018/19 and 2019/20. It was designed to build on Korea’s previous research by continuing to focus on research blocks where tagged fish have previously been released on the slope, while also prospecting two of the northern seamount complexes and two boxes on the continental shelf, where no research has occurred. Following a proposal from the Ukraine to join the research plan in 2018, the Scientific Committee requested an integrated proposal be developed for all three Members (SC XXXVII paragraph 3.191). This proposal updates the final year (19/20 fishing season) of the research plan with the recommendation from the Scientific Committee to integrate the Ukrainian research with the Korean and New Zealand research plan. We propose to continue the research on Dissostichus spp. in Subarea 88.3 from 2021/22 to 2023/24. The main objective of the proposal is to determine the abundance and distribution of Antarctic toothfish in Subarea 88.3. Secondary objectives are to improve understanding of stock and population structures of toothfish in Statistical Area 88, to carry out calibration trials among the vessels, to collect data on the spatial and depth distributions of bycatch species, and to trial scientific electronic monitoring technologies.

Mackerel icefish (Champsocephalus gunnari) is one of the most common and widespread species of Antarctic fish. Ukraine proposes to conduct a survey of Champsocephalus gunnari in the statistical Subarea 48.2 by the midwater trawl. The main objective of the research is to determine the distribution and the abundance of Champsocephalus gunnari in the Subarea 48.2.

Authors present the acoustic data obtained on the R/V Atlantida cruise in 2020 to examine spatial and temporal variability of krill distribution. These data were collected in Subareas 48.1 and 48.2 using the repeated  transect system, including: local survey in Bransfield Strait and two mesoscale reference transects  (one is in the Elephant Island stratum and one is in the  Scotia Sea stratum  along longitude 50⁰ w ). Acoustic observations at the local survey and on each of the reference mesoscale transect were undertaken twice with an interval of about a month (34-36 days). Acoustic data collection and processing were completed in full compliance with CCAMLR recommendations (with references within WG-EMM-16/38; WG-EMM-11/20, ASAM-16/01) and accompanied by trawl sampling and environmental observations. There were no commercial vessels in the study area, excluding the effect of krill fishing on the observed distribution of krill. Significant temporal variability in the krill distribution were identified, both at the local survey area and at each repeated mesoscale transect. Such changes are demonstrated in estimates of the density, horizontal and vertical distribution of krill. The change in the krill biomass in the local area under consideration in Bransfield Strait was 792.6 thousand tons being accompanied by a change in the krill length composition. According to the authors, the observed temporal variability of krill distribution at different spatial scales is a consequence of the influence of the krill flux by the current.

The Russian krill research in Subarea 48.1 and 48.2 were carried out by  RV “Atlantida”  in the period January-March 2020  including acoustic surveys, accompanied by a wide range of ecosystem studies on the biology of  krill and its habitat (hydrometeorological, oceanological and hydrochemical data)  bio-productivity indices  (chlorophyll, primary production, phyto-, zoo- and ichthyoplankton).  Krill survey was completed in full compliance with CCAMLR recommendations (with references within WG-EMM-16/38; WG-EMM-11/20, ASAM-16/01) and in full compliance with data processing of CCAMLR Survey 2000 (WG-EMM-11/20).  The krill flux study were provided based on system of reference transects. Survey provides up-to-date information on krill biomass distribution at varies spatial scales. The study area covered by acoustic survey in Subarea 48.1 and 48.2 was about 480 thousand km². The total krill biomass estimated at the survey area was 39, 29 mln.t , CV=9,29%. Statistical characteristics of krill biomass by stratum are shown.