Understanding the consequences of fisheries-related stressors on adult migrating Pacific salmon ...

• Main Author: Donaldson, Michael Ryan
• Format: Text
• Language: English
• Published: University of British Columbia 2012
• Subjects: Canada; Pacific; British Columbia; Fraser River; First Nations
• Online Access: https://dx.doi.org/10.14288/1.0072820; https://doi.library.ubc.ca/10.14288/1.0072820

Adult Pacific salmon (Oncorhynchus spp.) are targeted by the recreational, commercial, and First Nations fisheries during their spawning migrations through the Fraser River, British Columbia, Canada. Salmon can escape from each fishery or be released either voluntarily or due to mandate. Despite a high proportion of Pacific salmon released from each fishery, the primary (e.g., catecholamine, corticosteroid), secondary (e.g., metabolic, osmoregulatory, cellular), and tertiary (e.g., behavioural, survival outcomes) responses to fisheries-related stressors remain poorly understood. The overarching hypothesis of this thesis was that fisheries-related stressors displace fish from homeostasis, resulting in primary and secondary stress responses leading to tertiary outcomes, which in turn can be countered by facilitated recovery techniques. A range of fisheries-related stressors resulted in physiological disturbances reflected by primary, secondary, and tertiary stress responses. Telemetry studies revealed delayed ...