Report of the Greenland halibut (<i>Reinhardtius hippoglossoides</i>) Age Determination Workshop
Bibliographic record
Abstract
In accordance with its mandate to disseminate information on fisheries research to the scientific community, the Scientific Council of NAFO publishes the Journal of Northwest Atlantic Fishery Science, which contains peer-reviewed primary papers and notes on original research, and NAFO Scientific Council Studies, which contains review papers of topical interest and importance.Each year since 1981, the Scientific Council has held at least one Special Session on a topic of particular interest, and many of the contributions to those sessions have been published in either of these NAFO publications.There has been increasing concern regarding the interpretation of otolith structure, particularly for slow growing, long lived fishes.In general errors in age determination could lead to an underestimation of the age of the fish and a consequent over-estimation in the annual yield that can be taken sustainably.Greenland halibut have long been known to be difficult to age and in 2004 NAFO's Scientific Council recommended that an age determination workshop be convened to address this issue.To ensure the widest possible participation, the workshop was held in 2006 in St. John's, Newfoundland and Labrador.A rigorous otolith exchange and cross-validation program was undertaken prior to the workshop and used to identify individual and systematic errors arising from the variety of methods used.Results from the application of age validation methods were presented and appropriate conclusions drawn.It was found that older and larger specimens were being under-aged, although it was not possible to identify the extent of this with the methods currently available.This NAFO Scientific Council Studies No. 41 provides an accurate and illustrated account of the progress made during the meeting.It includes many excellent and annotated photographs of otoliths that will provide a valuable reference tool for all fish aging laboratories.The many powerpoint presentations are also included in the appendices and give a fantastic overview of the current problems and solutions in the aging of Greenland halibut.
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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 | 0.004 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.006 | 0.002 |
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".