An Exploratory Fishing Survey and Biological Resource Assessment of Atlantic Hagfish (<i>Myxine glutinosa</i>) Occurring on the Southwest Slope of the Newfoundland Grand Bank
Bibliographic record
Abstract
An exploratory Atlantic hagfish (Myxine glutinosa) survey was conducted on the southwest slope of the Newfoundland Grand Bank during autumn 2002 to collect samples for a biological resource assessment and investigate the selective properties of baited 227-litre traps with 12.7, 13.5, and 14.3 mm (1/2", 17/32", and 9/16") diameter escape holes. Atlantic hagfish were found to exhibit a juvenile hermaphroditic stage. Female Atlantic hagfish exhibited a total length (TL) at first, 50%, and 100% sexual maturity of 354, 378, and 440 mm, respectively. The testis was small and rudimentary showing no sign of maturation in the form of enlarged lobules in 350 hagfish examined within a size range of 195-638 mm TL. Each sexually mature female possessed a single clutch of developing ovoid eggs of similar size and 28% possessed both developing and degenerating eggs. Degenerating eggs were limited to the early stage of the reproductive cycle among females with developing eggs that were <12 mm in length. Examination of females with large (14 mm) eggs revealed a positive correlation (r 2 = 0.61) between fecundity and total body length, however, the reproductive potential was low (11-38 eggs per female). Recent evidence of a seasonal reproductive cycle and current findings of a bimodal egg length-frequency distribution and the presence of several females with postovulatory follicles in a single point in time sample suggest there may be up to three synchronized spawning events per year on the Grand Bank. The intermediate status of the Grand Bank population with respect to maximum length, size at first attainment of sexual maturity, and body markings relative to populations in the eastern North Atlantic and continental shelf and slope waters of the eastern US corroborates the existence of clinal variants. Catches in control traps indicate a clear tendency for the average individual hagfish body size to increase with depth over a 146-664 m depth range. A length-weight relationship indicated the minimum marketable body weight coincides with a total length of 410 mm. The 14.3 mm trap consistently captured the lowest percentage of undersized (<410 mm TL) individuals. Studies suggest few hagfish will survive when released, therefore it is recommended Grand Bank fishermen be encouraged to use traps with 14.3 mm escape holes or larger.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.005 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.002 |
| Scholarly communication | 0.000 | 0.001 |
| 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".