CCAMLR

CCAMLR has had success in tackling marine debris from local sources in the Southern Ocean; however it remains a persistent threat. Current understanding of the distribution and impacts of marine debris, particularly in pelagic areas, is limited. This is particularly concerning, as recent evidence suggests that microplastic concentrations in the Southern Ocean are higher than previously thought, and that they are from local and international sources.

Knowledge of the impacts of debris, particularly microplastics, in Antarctic ecosystems is understudied. Combatting the problem of microplastics in the Southern Ocean will require a collaborative effort between CCAMLR and other Antarctic Treaty System bodies, notably the CEP, introducing new mechanisms  instruments to mitigate local sources of microplastics. These may be from both shipping activity and untreated greywater from Antarctic bases.

This paper outlines the significant gaps in knowledge of the spatial distribution of marine debris in the Antarctic relative to the rest of the world. ASOC proposes that offshore and sediment monitoring of marine debris is needed, particularly to investigate the trend of heightened microplastic concentrations in areas of high human activity in the Antarctic. Understanding of the ecological impacts of this debris is also limited, and avenues to assess these impacts on the population and community levels should be explored. CCAMLR has the capacity to detect and monitor the impacts of marine debris on populations, and could set an example for other management bodies seeking to reduce the impacts of this problem on marine species.

Exploratory fishing for toothfish (Dissostichus spp.) in Subarea 88.3 began with a survey by Chile in 1999. Since then there have been research surveys by New Zealand (2005), Russia (2011 and 2012) and Korea (2016 and 2017). However, there is still considerable uncertainty about the abundance of Antarctic toothfish in Subarea 88.3 and the Scientific Committee has requested members complete research in this area to address that uncertainty. There is also considerable uncertainty about the stock structure of Antarctic toothfish in this subarea – and their relationship to the rest of the Pacific Sector (Parker et al. 2014).

A 3-year research plan for this subarea was commenced by Korea in 2016 and new proposals to carry out research fishing in this subarea were submitted to WG-SAM-17 by New Zealand and Ukraine. WG-SAM-17 recommended that the proponents collaborate to produce a single multi-Member coordinated research proposal for presentation at WG-FSA-17 (WG-SAM-17, para 4.89). This joint research proposal is for an additional 3 years covering the period 2018, 2019 and 2020. It is designed to build on Korea’s previous research by continuing to focus on those research blocks where tagged fish have previously been released on the slope, whilst also prospecting two of the northern seamount complexes and two boxes on the southern shelf, where little or no fishing has occurred. The main objective of the proposal is to determine the abundance of Antarctic toothfish in Subarea 88.3. Secondary objectives are to improve understanding of stock structure of toothfish in this area, to carry out calibration trials between the two vessels, to collect data on the spatial and depth distributions of bycatch species, and to trial electronic monitoring using video cameras.

Fishing in the Amundsen Sea region (SSRUs 882C–H) has been managed through a research plan since the 2015 fishing season. The aim of the research plan is to collect sufficient information to carry out a reliable stock assessment of the toothfish stock in that area. In this report, we assess if the research plan is thus far achieving its goals and if the current fishing level is deemed precautionary.

In the 2016 and 2017 seasons, a total of 19 tagged fish (excluding within season recaptures) were recaptured in the research blocks in the South Amundsen Sea region, confirming the utility of the research plan to recapture tagged fish, and providing key information on the size of the population in the South. Although only 4 tagged fish were recaptured (excluding within season recaptures) in the North (SSRU 882H) in 2017, the increase in tagging rate to 3 fish per tonne in the 2017 season has increased the number of tagged fish at liberty and therefore the number of recaptures of tagged fish is likely to increase in the 2018 season.

Catch rates, length frequency data, access to research blocks and Chapman biomass estimates for the North and South areas all indicate that the current catch limits in the Amundsen Sea region are precautionary and we recommend extending the current research plan for 2018 season.

No validated age data are currently available since 2014 for the North, and for 2014, 2015, and 2017 from the South to support the development of a stock assessment.

We provide extensive diagnostic plots for the 2017 models R1 and R3 for Antarctic toothfish in the Ross Sea as recommended by WG-SAM-15 (2015). The stock assessment rationale and models as well as their main diagnostics are described in Mormede (2017). The CASAL files for the assessment models were provided to the CCAMLR Secretariat as a zip file.

In this paper we present the results for first inputs, model R1 and then model R3. The diagnostic plots cover input data, MPD and MCMC outputs. Key tables are given in Mormede et al. (2017) including process error weightings and the MPD objective function components.

We provide a summary of the mark-recapture data inputs to the 2017 Ross Sea region stock assessment.

A total of 44 827 Antarctic toothfish have been released and 2473 recaptured, and 1 191 Patagonian toothfish released and 103 recaptured since 2001. Effective tagging survival and tag detection rates for each vessel were calculated. In the last few years the effective tagging survival is estimated at about 65% and the effective tag detection rate at about 85%.

Ukraine proposes a plan for scientific research in Statistical Subarea 88.1 for vessels SIMEIZ, KOREIZ, CALIPSO and MARIGOLDS based on the provisions of paragraph 2 of Conservation Measure 91-05. Studies are expected to be conducted in the Special Research Zone.

The research of Dissostichus in Subarea 88.3 carried out by Chile in 1998, New Zealand in 2005, Russia in 2011 and 2012 and the Republic of Korea in 2016. It was noted that no tagged fishes were recaptured during the previous research activities. Studies are planned to be conducted from January to April, as ice conditions permit. It is planned that the number of longline sets will be 60 in four reserch blocks. It is planned to complete the study for Dissostichus spp. in Subarea 88.3 within 3 years.

Ukraine proposes to conduct survey in three research blocks in Division 58.4.2 during the season 2017/18. 

Ukraine proposes to carry out a scientific survey of Dissostichus spp. by bottom longline in the eastern part of Subarea 48.1.

The third year research survey of Ukraine in Subarea 48.2 by the fishing vessel SIMEIZ is finished. Ukraine proposes to continue survey in same boundary for the next 2 year.