Western Component Pollock MSE, Stock Status, and Advice
Bibliographic record
Abstract
Pollock (Pollachius virens) are a semi-pelagic gadid species found in the North Atlantic and are harvested as part of a multi-species groundfish fishery in the Maritimes Region. In the multi-species groundfish fishery, fishing effort on Pollock appears to have shifted primarily to catching Pollock as a bycatch species in some areas (e.g., 4Xmn), while remaining a directed species in others (e.g., 4Xpq). The population model accepted for this Management Strategy Evaluation (MSE) review shows alternating periods of high and low recruitment for Western Component Pollock throughout the time series. The stock is currently undergoing a period of low recruitment, with an annual average of 4.7 million recruits since 2016. The Limit Reference Point for Western Component Pollock was defined as 0.2 of the unfished biomass (B0; 14,350 mt) and the maximum removal rate (Flim) for a stock in the Healthy zone was defined as the fishing mortality rate that results in 40% of the spawning biomass per recruit in an unfished state (F40%SPR; 0.187) under the most recent levels of natural mortality. The Upper Stock Reference point was defined as 0.32 B0 (22,960 mt). The three-year running geometric mean of the survey biomass, adjusted for catchability to the gear, is 22,331 mt, placing the stock in the Cautious zone. Based on the available estimate of population biomass and the application of the selected Management Procedure, the advice for Western Component Pollock for fishing year 2023- 2024 is 3,609 mt. This represents an increase of 5.9% from the previous fishing year's total allowable catch (TAC) and is equivalent to a fishing mortality rate (F) of 0.176. Although Science has not provided catch advice for the 4Xmn portion of the Western Component Management Unit, it is recommended that the removal of any Eastern Component TAC be limited to the areas occupied by Eastern Component Pollock to avoid exceeding F for the rest of the Western Component Management Unit. Throughout the review of the Pollock MSE, a number of uncertainties have been identified. They are summarized in this report to frame the results of the MSE and to provide guidance for future research related to Western Component Pollock.
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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 | 0.009 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.015 | 0.003 |
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".