Short-Term Physiological Disruption and Reflex Impairment in Shortnose Sturgeon Exposed to Catch-and-Release Angling
Bibliographic record
Abstract
Abstract Sturgeons (Acipenseridae) are the most imperilled group of fishes globally. Yet, many species remain important targets of recreational anglers. In the Saint John River, New Brunswick, Shortnose Sturgeon Acipenser brevirostrum is a popular species targeted by recreational anglers. The International Union for the Conservation of Nature has placed Shortnose Sturgeon on the Red List as “Vulnerable,” and therefore this species is afforded protection from harvest in Canada by the federal Species at Risk Act. Here, we evaluated physiological stress using two principal components axes, RC1 and RC2, generated from blood lactate, glucose, and pH, hematocrit, and reflex impairment of sturgeon exposed to exhaustive chase experiments at a hatchery and angled sturgeon that were captured during an annual fall competitive angling event. Physiological indicators of stress increased with holding time for Shortnose Sturgeon transferred into a tank and for sturgeon exposed to chase trials. Circulating metabolite concentrations were not associated with reflex impairment. The odds of reflex impairment increased as a function of air exposure, with a 1-min increase in air exposure increasing the odds of impairment by 1.78. All sturgeon survived hatchery experiments. Most of the wild Shortnose Sturgeon captured in the fishing derby (71%) exhibited reflex impairment, and 38% had superficial injuries such as cuts or wounds. None of these factors were associated with physiological disturbance, although ordinated stress physiology axes were elevated both 1 and 2 h after initial sampling, which was predictive by the holding time prior to weigh-in and measuring fish size. All fish were hooked in the mouth and each was released alive from the derby. Taken together the evidence suggests that Shortnose Sturgeon are resilient to recreational angling interactions, yet managers could use this information to improve best practices of catch-and-release angling.
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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".