Language selection


Terms of Reference

Framework Review for 4X5Y Haddock: Part 1 - Review of Data Inputs

Regional Peer Review - Maritimes Region

October 17-18, 2023

St. Andrews, New Brunswick and virtual meeting

Chairperson: Tara McIntyre


Haddock (Melanogrammus aeglefinus) are caught as part of a multi-species groundfish fishery concentrated on the western Scotian Shelf (SS) and in the Bay of Fundy (BoF) in the Northwest Atlantic Fisheries Organization (NAFO) Divisions 4X5Y. The fishery and survey data inputs have historically been separated for the SS and the BoF on the basis of differences in growth rates between areas (Stone and Hansen 2015). The last data review and modelling framework was conducted in 2016 (Stone and Hansen 2015, Wang et al. 2017). A virtual population analysis (VPA) model with fixed natural mortality time blocks on older fish, was chosen to provide catch advice (Wang et al. 2017). In 2018, projections from the VPA model showed large retrospective patterns and there was a mismatch between the model predicted biomass and the survey biomass (Finley et al. 2018). The VPA model has therefore not been used to provide catch advice or estimate stock status since 2018, and stock status updates have been provided qualitatively by comparing the survey biomass index to 40% and 80% of the 1985–2020 time series median.

This meeting is the first in a series of peer review meetings in the 4X5Y Haddock framework review, initiated by DFO Maritimes Science. The objective of the framework is to review appropriate data inputs, evaluate analytical models and reference points, and test the performance of harvest control rules using closed-loop simulation.


The specific objectives of this first peer review meeting is to review and update the data inputs that will be used in the development of the modelling framework. This will include the following:

Expected Publication

Expected Participation



Participation to CSAS peer review meetings is by invitation only.

Date modified: