In semelparous Pacific salmon, increased cortisol levels accompany sexual maturation and
may be related to the rapid senescence and death that occur after spawning. In fish with …

Accurate and controlled methods to measure physiological stress are crucial to effectively
monitor and assess the health of wildlife populations and evaluate resilience to external …

Total cortisol, free cortisol and percent free cortisol were all significantly higher in
semelparous male chinook salmon Oncorhynchus tshawytscha than in iteroparous and …

Anadromous fish are vulnerable to anthropogenic and environmental stressors including
pollution, rising temperatures, and changes in food availability. Knowledge of how fish …

Semelparous Pacific salmon (Onchorynchus spp.) serve as an excellent model for
examining the relationships between life history, behavior and individual variation in …

In the sockeye salmon (Onchorynchus nerka), as well as a number of migratory salmonid
species, the plasma level of cortisol, the main stress hormone in fish, increases during the …

Whole body concentrations of cortisol were determined via radioimmunoassay in chinook
salmon, Onchorynchus tshawytscha, during early development in both stressed and non …

Life-history theory predicts that stress responses should be muted to maximize reproductive
fitness. Yet, the relationship between stress and reproduction for semelparous salmon is …

Circulating levels of cortisol, the major corticosteroid among teleosts, increase in response
to environmental Stressors. Cortisol has also been reported to be present in the freshly …

This thesis proposed to elucidate the relationship between stress and long-term behaviour
and survival in fish. The first study investigated whether" carryover" effects of stress influence …