Event Title

Concurrent Sessions B: Fish Physiology and Fishway Passage Success - When The Going Gets Tough, The Tough Get Going: Sex-Specific Differences In Adult Salmon Passage Success

Location

Agriculture Production Theater, Oregon State University

Start Date

26-6-2013 10:40 AM

End Date

26-6-2013 11:00 AM

Description

Pacific salmon migrations represent one of the most complex and intriguing biological phenomena in the animal kingdom particularly as the inability to reach spawning grounds results in zero lifetime fitness given their semelparous life history. In this presentation I review some key findings from our past 10 years of research involving the study of behavior, physiology and survival of up-river migrating adult sockeye salmon. Using physiological and conventional telemetry in field studies, and intervention experiments in laboratory flumes and tanks, we have discovered that when faced with challenging conditions towards the end of their migratory period (e.g. high or turbulent flows, high temperatures, confinement) females suffer 2-5X higher mortality than males. Such elevated mortality in females has been observed for sockeye passing through a fishway located within a short distance of spawning grounds. The causes of this phenomenon are still unclear though maturing female sockeye salmon maintain higher levels of circulating plasma cortisol compared to males, and we suspect that females could be immunocompromised and less resistant to pathogens whose rates of development are accelerated by stressful migratory conditions. The broader implications of this to fishway passage and reproductive success will be discussed.

Comments

Dr. Hinch is a fisheries scientist who studies factors affecting the behavior, physiology and survival of juvenile and adult migrating Pacific salmon. He collaborates on studies ranging from genomics to social sciences, and uses an interdisciplinary approach to tackle pressing issues in conservation and management of Pacific salmonids. He works closely with fisheries agencies in conducting research that is needed for guiding management and policy. He is currently a lead scientist for the ‘Pacific Arena’ of Canada’s Ocean Tracking Network (OTN), a research consortium involving academic and government investigators from across the country.

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Jun 26th, 10:40 AM Jun 26th, 11:00 AM

Concurrent Sessions B: Fish Physiology and Fishway Passage Success - When The Going Gets Tough, The Tough Get Going: Sex-Specific Differences In Adult Salmon Passage Success

Agriculture Production Theater, Oregon State University

Pacific salmon migrations represent one of the most complex and intriguing biological phenomena in the animal kingdom particularly as the inability to reach spawning grounds results in zero lifetime fitness given their semelparous life history. In this presentation I review some key findings from our past 10 years of research involving the study of behavior, physiology and survival of up-river migrating adult sockeye salmon. Using physiological and conventional telemetry in field studies, and intervention experiments in laboratory flumes and tanks, we have discovered that when faced with challenging conditions towards the end of their migratory period (e.g. high or turbulent flows, high temperatures, confinement) females suffer 2-5X higher mortality than males. Such elevated mortality in females has been observed for sockeye passing through a fishway located within a short distance of spawning grounds. The causes of this phenomenon are still unclear though maturing female sockeye salmon maintain higher levels of circulating plasma cortisol compared to males, and we suspect that females could be immunocompromised and less resistant to pathogens whose rates of development are accelerated by stressful migratory conditions. The broader implications of this to fishway passage and reproductive success will be discussed.