Fisheries Reference Points for Striped Bass (Morone saxatilis) from the Southern Gulf of St. Lawrence
Bibliographic record
Abstract
The Striped Bass (Morone saxatilis) population of the southern Gulf of St. Lawrence, the most northern spawning population of the species distribution in eastern North America, is widely distributed in estuaries and coastal waters of the southern Gulf of St. Lawrence from the north shore of the Gaspe Peninsula in Quebec to the northern tip of Cape Breton Island, Nova Scotia. For purposes of assessment and development of fisheries reference points, the southern Gulf Striped Bass population distribution comprises the Gulf of St. Lawrence region. Following on the sustained rebuilding of the spawner abundances from the lows of the late 1990s to the current high abundances that exceed 300 thousand spawners, DFO Gulf Ecosystems and Fisheries Management requested the development of fisheries based reference points that conform to the Precautionary Approach (PA) to guide further management decisions on the development of the Striped Bass fisheries. The extensive information on the abundance and biological characteristics of the Striped Bass population of the southern Gulf of St. Lawrence is presented. An age structured population model is used to estimate stock and recruitment parameters and associated mortality rates at age based on assessed abundances of spawners for the years 1996 to 2019. Equilibrium modelling is used to define candidate Limit Reference Point (LRP), Upper Stock Reference (USR), and removal rate references that would conform to the Precautionary Approach. Despite model uncertainties, a LRP value of just over 330 thousand spawners is consistent with one of the population model results as well as with the history of the management decisions for re-opening of fisheries access since 2013. The USR value of 720 thousand spawners would represent a healthy condition for this population, based on the assessed spawner abundances to 2019 and on the potential productive capacity of this population. A number of knowledge gaps and uncertainties remain. The most important assessment and management gap is the incomplete to non-existent catch statistics for any of the Striped Bass fisheries in the southern Gulf of St. Lawrence, including Indigenous Food Social and Ceremonial fisheries and the larger recreational fisheries. In the absence of these catch and harvest data, it is not possible to provide fisheries management advice in terms of total allowable catches nor can the status of the population relative to removal rates be assessed. Striped Bass is a predator of other valued anadromous fisheries species in the southern Gulf of St. Lawrence. The reference points presented are derived based on optimizing value functions specific to Striped Bass. No multi-species reference points or management options are discussed.
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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 | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".