Homeward bound: A population study on Chinook Salmon (Oncorhynchus tshawytscha) in the Capilano River
Bibliographic record
Abstract
The decline of Pacific salmon populations on the west coast of Canada has been observed for decades. Hatcheries are used as one solution to this issue, however the benefits and detriments of releasing hatchery-grown salmon into the wild are widely debated. We investigated the release and return numbers of Chinook salmon, Oncorhynchus tshawytscha , at the Capilano River Hatchery in North Vancouver, British Columbia. This study focuses on: (1) establishing whether or not there is a declining trend in the number of returning Chinook salmon over the past seven years, and (2) deciphering the survival rate of a population of salmon. Data was collected by counting the returning Chinook salmon over 10 trials of one hour each. We calculated daily average as well as the use of the release and return data of previous years at the Capilano River Hatchery. The returning rate of Chinook salmon over the past seven years displayed a declining trend until the input of our data, which may be a result of unaccounted environmental factors, such as river height. The return numbers for the 2010 population of Chinook salmon was less than 1.28% in comparison to the amount of salmon released (98.1%). When comparing 2010-2016 return numbers per year, there was no significant effect on returns (z=0.864, df=6, p=0.3875), but there was a significant effect of both Sea Surface Temperature (SST) (z=2.343, df=6, p=0.0191) and an interaction between year and SST (z=-2.338, df=6, p=0.0194) on return numbers. The benefits of these hatcheries remain unclear and should be further studied.
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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 | 0.000 | 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 | 0.001 |
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".