Assessment of Atlantic Wolffish (Anarhichas lupus) population trends on the Scotian Shelf
Bibliographic record
Abstract
The Committee on the Status of Endangered Wildlife in Canada (COSEWIC) assessed the status of Atlantic Wolffish (Anarhichas lupus) as special concern in 2000. The Atlantic Wolffish was added to Schedule 1 of the Species at Risk Act in 2003. COSEWIC re-evaluated the status in 2012 and determined its status to remain as special concern. As the department responsible for the management of aquatic species at risk, Fisheries and Oceans Canada (DFO) undertook this assessment to examine recent trends in abundance and distribution of the portion of the Atlantic Wolffish population residing on the Scotian Shelf using data from DFO Research Vessel (RV) and industry surveys, commercial landings, at-sea commercial fishing observations and Species at Risk Act (SARA) logbooks. Based on the available data, the decrease in abundance of Atlantic Wolffish on the Scotian Shelf reported in the 2012 assessment has persisted over the last decade. Atlantic Wolffish are concentrated on the eastern Scotian Shelf (North Atlantic Fishery Organization [NAFO] Divisions 4VW), the western Scotian Shelf (Division 4X) around Browns Bank and west of German Bank, as well as isolated areas inshore of the 50-fathom line in Divisions 4WX, which have limited sampling. Both immature and mature abundance has declined since 1970. On the northeast peak of Georges Bank (Division 5Z), there is a small aggregation of Atlantic Wolffish that has declined > 90% since 1986, and remains very low today. Although there are no directed fisheries for Atlantic Wolffish in the Maritimes Region, the species is caught as bycatch in other fisheries. Annual landings of wolffish in 5Z and 4VW have been near 4 t since the 1990s; landings in 4X decreased rapidly in the early 2000s, and have remained below 10 t over the past decade. Atlantic Wolffish discards are observed in multiple fisheries; however, estimates of total discards were not determined. The levels of fishing removals from various fisheries are, therefore, not known. The Maritimes Region Ecosystem Summer RV survey has the longest time series and most comprehensive coverage of the Scotian Shelf, making it the primary source to monitor abundance trends and to inform management actions for the species.
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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 | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
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".