Reference Points for Canadian Eastern Georges Bank Haddock Fisheries
Bibliographic record
Abstract
Haddock (Melanogrammus aeglefinus) on eastern Georges Bank (EGB) is a Canada/United States transboundary species and is assessed by the Transboundary Resource Assessment Committee (TRAC). For Canadian domestic fishery management, biomass reference points are required to implement DFO’s fishery decision-making framework incorporating the precautionary approach. A new statistical catch-at-age model was developed for EGB Haddock in 2022; therefore, it was necessary to provide updated advice and recommendations on biomass reference points. The productivity relationships for two different time periods (1931–1954, 1969–2020) were examined. The 1969–2020 time series of data was considered the most appropriate for the calculation of reference points due to the absence of evidence of productivity regime shifts and full availability of age composition data. Brecover, defined as the lowest spawning stock biomass (SSB) on record that resulted in sustained recovery to historically high levels, was determined to be the most appropriate candidate limit reference point (LRP) for EGB Haddock. Brecover for EGB Haddock was explicitly defined as the minimum biomass between 1991 and 1996. Using this definition, and the current model outputs, the minimum estimate of SSB occurring in 1993 is the identified LRP for EGB Haddock (8,620 mt). The proposed upper stock reference (USR) was calculated using the “Rago-Razor” method based on spawning stock biomass and recruitment data between 1969 and 2020 and is estimated as 26,732 mt.
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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 | 0.003 | 0.006 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.004 | 0.004 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
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".