Sessions

Sessions

Sessions
No. Session title Organizer Session abstract
28 ADVANCEMENTS IN STOCK ASSESSMENT AND THE PROVISION OF MANAGEMENT ADVICE (PART 1)
  1. Richard D. Methot, richard.methot@noaa.gov
  2. Mark Maunder, mmaunder@iattc.org
The 2012 World Conference of Stock Assessment Methods initiated a widespread effort to communicate and advance the field of fishery stock assessments. Advances continue to be made at a rapid pace in methods to analyze fishery catch, abundance and biological data to provide scientific advice for fishery management. These advances seek to deal with integrating all the information available, with data-limited situations, with conflicts among data sources in data-rich situations, and with the inclusion of data made available by new technologies and ecosystem investigations. They extend abilities to address complex processes across space and time, while still extracting major signals in the underlying system being studied. They directly address methods to track long-term drift in a system’s underlying dynamics due to climate, ecosystem and habitat changes without relying on direct information on the causal factors. They expand the scope of the factors modeled so that causal mechanisms such as predator-prey relationships become part of the modeled system. As model complexity increases, so does the challenge of ecosystem monitoring and dealing properly with the uncertainty associated with the large number of structural factors that need calibration. Effective models also need to address methods to distill complex information into informative advice for fishery managers and the stakeholders while taking uncertainty into consideration. We see development of methods ranging from the use of a diversity of operating models in management strategy evaluations to the development of decision support systems based on ensembles of models.
29 AN HONEST APPRAISAL OF STOCK ASSESSMENT, REFERENCE POINTS, HARVEST CONTROL RULES AND MANAGEMENT STRATEGY EVALUATION (PART 2)
  1. Richard D. Methot, richard.methot@noaa.gov
  2. Mark Maunder, mmaunder@iattc.org
As fisheries management around the world moves towards adoption of more formal rules for fisheries management (e.g. harvest control rules based on reference points), more accurate and precise stock assessments become all the more important. Unfortunately however, stock assessments are generally imprecise because of the limited information of the data typically available, and their accuracy is strongly dependent on simplifying assumptions. This situation is not likely to improve appreciably in the near future. It is not unusual for estimates of management quantities to double or halve based on alternative assumptions. As a consequence, management strategy evaluation (MSE) has become popular, but it is often restricted to application under simple stock assessment approaches or empirical indicators. In addition, MSE is often conditioned on traditional stock assessments, which are used to develop states of nature consistent with the data available for assessments. In many cases there has been no demonstration that MSE performs any better than traditional stock assessment in the provision of management advice. As a consequence, the reference points and harvest control rules that are generally applied come into question. Improved estimates of uncertainty and methods to account for such uncertainty in management advice are needed. Linked to this there is a need to resolve the frequent mismatch between the management advice that stock assessment scientist can and do provide and the management advice that is desired by stakeholders. We propose a session at the 7th World Fisheries congress that addresses the resolution of this mismatch. We envision presentations that assimilate a broad spectrum of information rather than specific information. These include opinion pieces from researchers with considerable experience. The goal of the session would be to provide guidance on what approach should be taken in providing management advice and where we should be heading for the future. The session would be linked with another larger session that focusses on more specific methodology or applications. The session will cover half a day with 5 presentations of 30 minutes (25 + 5 for questions) and a 30 minute panel discussion. The panel will involve the 5 speakers (see below). Written discussion questions will be solicited from the audience in advance and the chair will choose which questions will be asked. Mark Maunder will chair the session and panel discussion.
35 STOCK ASSESSMENT METHODS: CURRENT STATUS AND RECENT INNOVATIONS
  1. JaebongLee, National Fisheries Research & Development Institute, Gijang-gun Busan, Korea, leejb@korea.kr
  2. JunghwaChoi, National Fisheries Research & Development Institute, Gijang-gun Busan, Korea, choi2291@korea.kr
Traditional fisheries resource evaluations have focused on target species at the population level. However, understanding not only the surrounding ecosystem environment of fisheries resources but also related mechanisms with other organisms is a prerequisite for a fisheries resource evaluation. Against this backdrop, evaluation methods including the current status of resource evaluation, challenges and mechanisms concerning the whole future ecosystem will be discussed with this topic.