Changes in v-notch depth after molting in the American lobster, <i>Homarus americanus</i> Milne-Edwards, 1837 (Decapoda: Pleocyemata: Nephropidae)
Bibliographic record
Abstract
Abstract The stocks of the American lobster, Homarus americanus Milne-Edwards, 1837, off Newfoundland and Labrador, Canada are heavily exploited and few females survive beyond their first molt into the fishery. V-notching is a mark-recapture, voluntary practice in the fishery but there are strict guidelines on the retention of any possible v-notched lobsters. In response to calls to relax the definition of what constitutes a v-notch, we developed a laboratory study to quantify the change in v-notch depth with molt and relate changes in carapace length to changes in potential fecundity. We collected 32 egg-bearing lobster from the field in June 2022. The females were v-notched, and the v-notch depth and carapace length were measured before and after molting. We found the v-notches were clearly visible after one molt. Under current restrictions, these females would have been protected during their following clutch, where potential fecundity increased by up to 68%; however, 18.5–88.9% could have been harvested if the definition of v-notched was relaxed. These findings suggest that current restrictions are more effective in the management of this heavily exploited fishery, and more widespread v-notching would boost the population’s reproductive potential and survival rate of newly recruited females.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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 teacher head, 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".