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- Title
Investigating three sources of bias in hook-and-line surveys: survey design, gear saturation, and multispecies interactions.
- Authors
Kuriyama, Peter T.; Branch, Trevor A.; Hicks, Allan C.; Harms, John H.; Hamel, Owen S.
- Abstract
Hook-and-line surveys can be used to estimate population trends in fish species where conventional methods such as trawl, acoustic, visual, or pot surveys cannot be applied. Hook-and-line surveys allow for the collection of biological information, but the resultant indices of abundance may be biased. We designed simulations to address concerns around survey design, hook saturation, and competition among species and found that catch per unit effort (CPUE) declined more slowly than population size across all scenarios. This hyperstability was most prominent when fish were found in high-density patches, and these scenarios have median absolute relative error values roughly three to five times greater than those with more even distributions of fish density. Despite hyperstability, the surveys still had statistical power to detect changes in abundance. Interspecific competition for hooks caused bias in survey results when one species was more aggressive than another. Taken together, our results indicate hook-and-line surveys fill a niche in survey methodologies, but their use and interpretation can be challenged by hyperstability and competition among species.
- Subjects
FISHES; FISHING catch effort; FISH populations; COMPETITION (Biology); SURVEYS
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2019, Vol 76, Issue 2, p192
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/cjfas-2017-0286