Identifying a limit reference point for Striped shrimp (Pandalus montagui) in shrimp fishing area 4
Bibliographic record
Abstract
Off Atlantic Canada, Striped Shrimp (Pandalus montagui) are fished in Eastern Assessment Zone (EAZ), Western Assessment Zone (WAZ), and Shrimp Fishing Area (SFA) 4. Although there is assumed to be strong mixing and movement of the population throughout these areas, each of the three zones are assessed independently. To counteract this spatial-scale mismatch, and in accordance with Fisheries and Oceans Canada (DFO) Precautionary Approach (PA) framework, a limit reference point (LRP) for Striped Shrimp based on the combined survey data time series (2005–22) of SFA 4, EAZ, and WAZ was developed from a spatiotemporal model that created a new fishable biomass index for the entire region (FBpop) to determine the stock status in SFA 4. The LRP was based on FBpop and was calculated as the average of three methods: 1. the lowest fishable biomass at which the stock increased and remained above the geometric mean for a period of at least three years, 2. 40% of the geometric mean of the fishable biomass index throughout the time series, and 3. the lowest observed fishable biomass in the time series. An LRP based on methodology, rather than an estimate of biomass, and a consistent reference period (2005–22) will allow for adjustments as model refinements are made and additional data are collected. In recognizing FBpop as an index, the status of SFA 4 Striped Shrimp will be provided based on its relatively position in relation to the LRP. In addition to an LRP, three additional indicators of stock health were identified as important metrics for monitoring and reporting to highlight any concerning trends (“red flags”): potential predator index (ecological outlook), total egg production index (reproductive health), and SFA 4-specific fishable biomass index (local population health). In 2022, FBpop was estimated to be five times the LRP with high certainty. Other indices of stock health (the potential predator index, total egg production index, and SFA 4-specific fishable biomass index) showed no cause for concern.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".