Results
This stock is assessed utilizing a surplus production model in a Bayesian framework. Full assessments were conducted annually from 2017-2020 and in 2022.
The input data were catch from 1960-2021, Canadian spring survey series from 1984-1990, Canadian spring survey series from 1991-2019 (no 2006, 2020 or 2021 surveys) and the Canadian autumn survey series from 1990-2020 (no 2014 or 2021 surveys).
The next assessment is planned for 2024.
Human impactMainly fishery related mortality. Other potential sources (e.g. pollution, shipping, and oil-industry) are undocumented. The impact of bottom fishing activities on major VMEs in the NRA was last assessed in 2021. The risk of Significant Adverse Impacts (SAIs) on sponge and large gorgonian VMEs was assessed to be low, while this risk for sea pen VMEs has been assessed as intermediate. The risks of SAIs on small gorgonian, black coral, bryozoan and sea squirt VMEs were assessed as high. This assessment of impacts of bottom fishing activities on VMEs does not include waters within coastal states jurisdictions. Within the Grand Bank (3LNO) EPU areas in Div. 3O and 3L have been closed to fishing to protect corals.
Biological and environmental interactionsWitch flounder in NAFO Divs. 3NO are distributed mainly along the tail and southwestern slopes of the Grand Bank.
The Grand Bank (3LNO) EPU continues to experience low overall productivity conditions, and total biomass remains well below pre-collapse levels. However, recent warming, earlier phytoplankton spring bloom, and an increase in the proportion of energy-rich copepod species may have positive effects on total ecosystem production in the coming years.
Fishing MortalityRecruitmentBiomass