The reproductive physiology of witch flounder, Glyptocephalus cynoglossus
Bibliographic record
Abstract
The witch flounder (Glyptocephalus cynoglossus), or grey sole, as it is commonly known, is a member of the family Pleuronectidae (right eye flounders) and is found in the Northwest Atlantic near Hamilton Bank off southern Labrador, southward over Newfoundland banks, Gulf of St. Lawrence, Scotian Shelf, Bay of Fundy and Gulf of Maine, to Cape Lookout, NC. The witch flounder has become increasingly important commercially since the 1940's. There was heavy exploitation of witch flounder by foreign ships in the early 1970's but with the introduction of Canada's 200-mile limit in 1977, foreign fishing for the species was reduced and Canada's take increased. -- This study focused on the adaptation of wild witch flounder to captivity and the development of a captive broodstock. Areas of concentration focused on growth and maturation, with emphasis on the reproductive biology (pattern of oocyte development, endocrinology and gamete analysis) of the witch flounder. This information will be used to help determine whether the witch flounder is a good candidate as an aquaculture species. -- The reproductive cycle of both the male and female witch flounder is characterized by distinct seasonal variations and fluctuations in plasma sex steroids associated with reproductive activity. As seen in other teleosts, the circulating levels of sex steroids increased as gamete maturation and gonad growth proceed, reaching peak levels during spawning. -- Oocyte size-class frequency distributions of witch flounder demonstrate the presence of just a single clutch of progressively developing vitellogenic oocytes, indicating group-synchronous development, by far the most common reproductive strategy in teleosts. -- Male witch flounder produce low volumes of viscous milt and sperm is only available for five months of the year (April--August). This correlates with spawning events in the female witch flounder, with ovulated eggs from late June to late August.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| 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".