CCAMLR

We provide a perspective on steepness, reference points for fishery management, and stock assessment. We first review published data and give new results showing that key reference points are fixed when steepness and other life history parameters are fixed in stock assessments using a Beverton–Holt stock–recruitment relationship. We use both production and age-structured models to explore these patterns. For the production model, we derive explicit relationships for steepness and life history parameters and then for steepness and major reference points. For the age-structured model, we are required to generally use numerical computation, and so we provide an example that complements the analytical results of the production model. We discuss what it means to set steepness equal to 1 and how to construct a prior for steepness. Ways out of the difficult situation raised by fixing steepness and life history parameters include not fixing them, using a more complicated stock–recruitment relationship, and being more explicit about the information content of the data and what that means for policy makers. We discuss the strengths and limitations of each approach.

For several years, ASOC has been calling for improved management of Antarctic krill fisheries. In this paper, ASOC urges CCAMLR to continue to work towards requiring 100% scientific observer coverage on board krill vessels, identifying priority objectives for research and development in support of the management of the krill fishery, conducting a new krill synoptic survey, keeping the trigger level as the enforceable catch limit, improving monitoring through a strengthened CEMP program, continuing efforts towards estimating green weight and krill escape mortality, reviewing krill notifications procedures with the aim of reducing speculative notifications, and requiring mandatory ice-strengthening for krill fishing vessels.

CCAMLR began work to develop a representative system of marine protected areas (MPAs) in 2005. Now in 2014, despite commitment within both the Scientific Committee and the Commission and the concerted effort by CCAMLR Members, significant progress towards implementing a representative system of MPAs has stalled. Furthermore, ASOC has been concerned to see a diminishing scale of ambition for CCAMLR’s representative system of MPAs and marine reserves. ASOC believes that the changes to proposed CCAMLR MPAs over the past several years have reflected a ‘lowest common denominator’ approach to consensus decision-making. The time has come for CCAMLR to move decisively towards meeting its commitment to implement a representative system of MPAs by designating the East Antarctic and Ross Sea MPAs.

There are a number of actions that CCAMLR and its members should implement to improve the governance and control of fishing vessels in the Southern Ocean, thereby enhancing safety, and improving ecosystem-based management and environmental protection. These actions include a mandatory requirement for ice-strengthening for fishing vessels, a two-tier system of training for vessels crews and Masters, and identification of requirements for environmental response and monitoring in the event of an incident. Additionally, CCAMLR should make a commitment to engage fully in the extension of the Polar Code to non-SOLAS vessels including fishing vessels and should inform the IMO of recent incidents involving fishing vessels in the Southern Ocean and developments introduced by CCAMLR.

CCAMLR has previously recognized the importance of considering climate change impacts when making management decisions. However, to date this has not been explicitly incorporated in most working papers, even though climate change and ocean acidification are relevant to a wide range of policy decisions. Government bodies often require the inclusion of similar statements to be included with the submission of new or revised legislation or regulations when an issue has relevance to a broad spectrum of decisions. ASOC therefore recommends that CCAMLR adopt a resolution urging Members to include a climate change implications statement in their working papers and fisheries reports. This text could also be appended to Resolution 30/XXVIII.

Policymakers and marine managers are increasingly using MPAs and marine reserves to achieve better conservation outcomes for marine areas. As these areas grow in number, it is important to analyze whether they are in fact achieving their desired outcomes and what factors led to their success. One major study published this year identified five characteristics of MPAs that achieved statistically significant outcomes on fish population metrics, including: “no take, well enforced, old (>10 years), large (>100km²) and isolated by deep water or sand” (Edgar et al. 2014). Two analyses of New Zealand’s system of marine reserves, which has now been in place for several decades, indicate unexpected benefits for scientists and scientific research. NZ’s no-take reserves have effectively served as “control” areas without which researchers would not have been able to draw fully informed conclusions. CCAMLR should consider these findings as they discuss the current Ross Sea and East Antarctica proposals, as well as future MPA proposals, to ensure that Southern Ocean MPAs will likewise achieve their desired conservation and scientific outcomes.

The stock of Antarctic toothfish (D. mawsoni) in CCAMLR subarea 48.4 was estimated from tagging returns to be 1,027 tonnes during the  2013/14 season. In previous years the harvest rate used for Patagonian toothfish (D. eleginoides) in Subarea 48.3 (γ = 0.038) has been used as a precautionary harvest rate which would imply a 2014/15 yield of 35 tonnes compared to the 2013/14 TAC of 24 tonnes.
 

In June 2014, the ICED programme, the British Antarctic Survey and WWF co-hosted a two day workshop entitled “Understanding the objectives for krill fishing and conservation in the Scotia Sea and Antarctic Peninsula region” which involved participants from the science, conservation, and fishing industry sectors.  The workshop used structured dialogue, led by an independent facilitator, to explore each sector’s objectives and information requirements for the krill‐based ecosystem and to identify constructive ways for the three sectors to work together. The issue of krill-fishing has previously provoked passionate debate but participants in this workshop showed broad cross-sector accord. This included shared commitment to maintaining a healthy ecosystem and support for management of the krill fishery that minimises the risk of negative impacts on ecosystem health. Participants generally agreed that current levels of fishing have a low risk of significant impacts but that there is no need to increase catch limits.  Participants also agreed that the objectives of management must include a healthy krill stock and a healthy ecosystem. However, they were not able to define ecosystem states that are desirable or healthy. This reflects the gaps in the currently available information and the indirect nature of the links between the krill-based ecosystem and human well being. The workshop produced a range of recommendations including the need to articulate a clear research and development strategy to support progress in the management of the krill fishery; and to improve communication between The Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) and its stakeholders. The workshop also revealed a cooperative and productive relationship between the various sectors. Further cross-sector work could progress some key tasks such as identifying priority information requirements and assessing the potential future demand for krill catch.