Coho Salmon are Behaviourally Resilient After 120 Days of Rearing Under Altered Photoperiods and Salinities
Bibliographic record
Abstract
Recirculating aquaculture systems (RAS) are a sustainable method used in aquaculture to farm healthy stocks of fish intended for market. In order to optimize fish growth, environmental conditions within RAS, including salinity and photoperiod are manipulated. However, little is known about the effect of varying photoperiod and salinity on behaviour. In this study, Coho salmon (Oncorhynchus kisutch) smolts were reared in RAS for 120 days on either a 12 hour light: 12h dark or 24 hour light photoperiod and in salinities of either 2.5, 5, or 10 ppt. An additional group reared in 30 ppt and 24h light was examined. To determine the impact of photoperiod and salinity on behaviour, three behavioural test assays were employed. Locomotion was quantified using an open field test, the novel object approach test was used to quantify boldness, and the light/dark test was used to quantify anxiety-like behaviour. In the open field test we observed no significant differences in locomotion. In the novel object approach test, the 2.5 ppt (12h/12h) group demonstrated decreased boldness relative to the 10 ppt (24h) and 30 ppt (24h) groups. In the light/dark test, the 2.5 (12h/12h) group spent significantly less time in the dark zone. However, no significant differences were observed between any of the treatment groups, suggesting that anxiety-like behaviour was only minimally impacted. Taken together, the photoperiods and salinities investigated did not significantly affect coho salmon behaviour, which has important implications for RAS aquaculture. Presented in absentia on April 27, 2020 at Student Research Day at MacEwan University in Edmonton, Alberta. (Conference cancelled) Faculty Mentor: Trevor Hamilton Department: Psychology NOTE: This work is available to MacEwan users only at https://roam.macewan.ca/islandora/object/gm:2107
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.002 |
| 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 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".