Proceedings 2022/027
Proceedings of the Regional Peer Review on Northwest Atlantic Spiny Dogfish Framework Part 2: Review of Modeling Approaches and Assessment; June 27–28, 2018
Co-chairs: Kent Smedbol and Tana Worcester
Editors: Jennifer Ford
Summary
The last Department of Fisheries and Oceans Canada (DFO) Framework Review and assessment of Northwest Atlantic Spiny Dogfish occurred in 2014, using data up to 2010. Efforts to update the assessment with more recent data became progressively more difficult and, by 2015, abundance estimates for Spiny Dogfish were considered to be implausibly high. A new framework assessment for Spiny Dogfish was needed to provide updated management advice. The new framework was organized into two components, Data Inputs (Part I) and Modelling and Assessment (Part II).
Part II of the Framework Review took place on June 27–28, 2018, with the following objectives: (1) review the consequences of Part I recommendations on the assessment model for Northwest Spiny Dogfish, (2) review updated biological reference points and evaluate the status of the population relative to these reference points, (3) explore the consequences of different harvest levels on abundance and exploitation rate using the assessment model, and (4) recommend an assessment schedule that includes decision rules to trigger a new framework. The assessment model was not accepted as a basis for advice for a number of reasons, so it was not possible to meet these objectives as anticipated. In the absence of an accepted population model, it was agreed that DFO should work to provide advice based on the calibrated US spring survey index for mature females as the primary indicator of stock status in future stock assessments.
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