NEW RESULTS ON MATURITY STATUS OF WESTERN ATLANTIC BLUEFIN TUNA, THUNNUS THYNNUS
Bibliographic record
Abstract
SUMMARY We analyzed the reproductive and sexual maturity of 529 Atlantic bluefin tuna (ABFT, Thunnus thynnus) sampled from 2004-2010 on NW Atlantic foraging grounds off New England, Canada, and (young of the year, YOY) Virginia. Fish size was 107-292 cm CFL (excluding YOY), and gonadosomatic index (GSI) was 0.012-1.347. Although nearly all gonads sampled from fish >134 cm were regressed, sexual maturity evidence was detected via histology. Partially spent testes were present in males >145 cm and lipid stage oocytes were present in most females sampled in the Gulf of Maine during June-July. We obtained endocrine hormone profiles and compared pituitary gonadotropins (GtHs) across size classes, including YOY, presumably immature, and mature individuals. FSH/LH ratio was >2 among YOY (characteristic of immature fish) while FSH/LH ratio was 134 cm (characteristic of mature fish). Although some size gaps remain in our sampling (e.g., between YOY and 107 cm), our results are consistent with histological and endocrine analyses of maturity patterns in eastern ABFT and suggest a revision of the western ABFT maturity schedule is warranted. RESUME
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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 | 0.001 | 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".