<scp> <i>Saprolegnia parasitica</i> S1 </scp> and <scp>S2</scp> Strains Differ in Zoospore Transition Timing and Pathogenicity Against Juvenile Atlantic Salmon ( <scp> <i>Salmo salar</i> </scp> )
Bibliographic record
Abstract
S1 and S2 strains of S. parasitica are both common among diseased farmed salmonids in Nova Scotia, whereas globally S1 is rare and S2 is common. Following the initiation of asexual maturation and overnight incubation at 20°C then harvest, and incubation at 10°C in vitro, S2 secondary zoospores mostly transformed into cysts within 3 h, and by 6 h post-harvest > 80% had germinated. S1 zoospores, by contrast, exhibited persistent motility; at > 30 h post-harvest > 80% were in the motile stage, and < 10% were either cysts or germlings. The disease challenge test began with skin disruption by shaking pairs of fish in a net for 15 s, then stocking six fish in up to 12 aquaria (27 L water), addition of 400 zoospores/ml, held in static water for 11 h, then 10°C flow-through. Through smolting (January-June) at 10°C, S1 was consistently more virulent than S2 (p = 0.005), with gross disease signs evident among 50% of test fish in 40 h for S1 versus 72 h for S2. Susceptibility to disease was independent of smolt status (p = 0.512). Secondary motile zoospores, cysts, or germling stages of both strains all caused disease, but S2 germlings were the least pathogenic.
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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) | 0.002 | 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".