Proceedings 2023/015
Proceedings of the Regional Peer Review on the Review of Candidate Stock Assessment Frameworks for the Northwest Atlantic Fisheries Organization Subarea 0+1 (Offshore) Greenland Halibut Stock; December 12-15, 2022
Chairperson: Mary Thiess
Editors: Dayanne Raffoul and Adrienne McLean
Summary
Assessment of the North Atlantic Fisheries Organization (NAFO) Subarea (SA) 0+1 (offshore) Greenland Halibut (GH-0+1) stock uses time series data produced from bottom trawl surveys conducted by Fisheries and Oceans Canada (DFO) Science and the Greenland Institute of Natural Resources. The vessel (RV Paamiut) used for the surveys from 1999-2017 was retired in 2018 before paired trawling experiments with a replacement vessel could be conducted. In 2019, an interim vessel (FV Helga Maria) used the same gear (Alfredo trawl), and from 2022 and onwards a new vessel (RV Tarajoq) and gear (Bacalao) will be used. Assessing time series data often relies on an assumption that consistent methods and effort are used across years to ensure data are comparable. When changes in data collection methods occur, trawl survey time series are commonly standardized by conducting paired trawling experiments. Given the absence of such paired experiments, DFO is exploring analytical approaches that could be used to provide science-based advice on the status of the GH-0+1 stock in the short-term, while in the long-term exploring the potential of a contemporary, model-based assessment framework.
A DFO Canadian Science Advisory Secretariat (CSAS) Regional Science Advisory peer-review meeting was held between December 12-15, 2022 in Winnipeg, Manitoba that included virtual attendance via Microsoft Teams/Teleconference. The purpose of the meeting was to explore analytical approaches that could incorporate data collected by multiple vessels and gears for GH-0+1 stock assessment. These approaches would be used to provide advice so DFO Science could make further advances on these, or other, frameworks in the future. Scientifically defensible approaches will then be presented for review by the NAFO Scientific Council (SC). Three working papers were presented. All participants were required to complete a review of the working papers prior to the meeting. Participants included staff from DFO Science and Fisheries Management programs, representatives from the Greenland Institute of Natural Resources, the Marine and Freshwater Research Institute of Iceland, the Atlantic Groundfish Council, the Northern Coalition, the Institute of Marine Research in Norway, Qikiqtaaluk Corporation, the University of Windsor, and contracted experts from Blue Matter Science and Landmark Fisheries Research.
This Proceedings report summarizes the relevant discussions from the meeting and presents recommended revisions to be made to the associated research documents. The Proceedings, Science Advisory Report, and Research Documents resulting from this science advisory meeting are published on the DFO Canadian Science Advisory Secretariat (CSAS) website.
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