Science response: stock status update 4X5Y haddock for 2022
Bibliographic record
Abstract
Advice on the status of Haddock (Melanogrammus aeglefinus) in Northwest Atlantic Fisheries Organization (NAFO) Divisions 4X5Y (herein referred to as 4X5Y Haddock) is requested annually by Fisheries and Oceans Canada (DFO) Resource Management to help determine a Total Allowable Catch (TAC) that is consistent with the Integrated Fisheries Management Plan (IFMP). The most recent framework and assessment occurred in 2016 (Stone and Hansen 2015, Wang et al. 2017, DFO 2017). A Virtual Population Analysis (VPA) model with natural mortality (M) at ages 10 and older for three 5-year time blocks (2000–2004, 2005–2009, and 2010–2014) fixed at 0.3, 0.6, and 0.9, respectively, was recommended as the model for the 4X5Y Haddock stock assessment. Despite the uncertainties in estimating fishing mortality at Maximum Sustainable Yield (FMSY), it was agreed at this Framework meeting that a fishing mortality limit reference (Flim) of 0.25 would be the removal fishing mortality reference when the stock is in the Healthy Zone, and a fishing mortality target reference (Fref) of 0.15 would be an appropriate target when the stock is in the Cautious Zone. Given that the poor stock recruitment relationship precludes the calculation of an appropriate biomass at Maximum Sustainable Yield (BMSY), a more conservative biomass level from which the stock has been shown to recover (Brecover; Age 4+ biomass; 19,700 metric tonnes [t]) was recommended as the Limit Reference Point (LRP) for 4X5Y Haddock. In the spring of 2017, Resource Management agreed upon approximately twice the LRP, or 40,000 t, as the Upper Stock Reference (USR; Age 4+ biomass). In 2019, the standard projection from the 2018 model was not used due to the retrospective pattern that was observed in 2018 and the mismatch between the model results and the DFO Summer Research Vessel Survey (RV survey) biomass (DFO 2020). In 2020, indicators were provided along with information to support increasing, maintaining, or reducing catch in the 2021–22 fishing season. The objectives of this update are to report the commercial fishery landings data and the most recent data on the length captured by the fleet, and to comment on the changes in the available biological indicators. This Science Response Report results from the regional Science Response Process of December 15, 2021, on the Stock Status Update of Haddock in 4X5Y.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.006 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.003 | 0.003 |
| Insufficient payload (model declined to judge) | 0.094 | 0.052 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".