Conference on Early Migration and Premature Mortality in Fraser River Late-Run Sockeye Salmon
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منابع مشابه
Late-run Sockeye Salmon in the Fraser River, British Columbia, are Experiencing Early Upstream Migration and Unusually High Rates of Mortality—What is Going On?
Late-run stocks are unique among Fraser River sockeye salmon populations in that they typically delay in Georgia Strait 4 to 6 weeks prior to migrating upstream to spawn. Beginning in 1995, and continuing through 2002, this delay period to 6 weeks earlier than normal. Each year, the early river entry has been associated with high rates of en-route and prespawning mortality (>90% in 2000 and 200...
متن کاملA Comparison of Estimates of First Nations Catches of Fraser River Sockeye Salmon from 1996 to 1999 by Scale-based Discriminant Function Models and Run Reconstruction Models
Historically, the Pacific Salmon Commission has used run reconstruction models to assign stock of origin to sockeye salmon (Onchorhynchus nerka) catches in the Fraser River First Nations fishery. Since 1987, scale samples have been collected from sockeye caught in the First Nations fishery to enable the Pacific Salmon Commission to make direct scale-based estimates of the catch by stock group. ...
متن کاملBehaviour and physiology of sockeye salmon homing through coastal waters to a natal river
Adult sockeye salmon (Oncorhynchus nerka, N = 179) from six Fraser River populations (British Columbia) were intercepted in continental shelf waters »215 km from the Fraser River mouth, gastrically implanted with acoustic transmitters, non-lethally biopsied for blood biochemistry, gill Na,K-ATPase activity and somatic energy density and then released. Migration behaviour and travel times to the...
متن کاملConsequences of high temperatures and premature mortality on the transcriptome and blood physiology of wild adult sockeye salmon (Oncorhynchus nerka)
Elevated river water temperature in the Fraser River, British Columbia, Canada, has been associated with enhanced mortality of adult sockeye salmon (Oncorhynchus nerka) during their upriver migration to spawning grounds. We undertook a study to assess the effects of elevated water temperatures on the gill transcriptome and blood plasma variables in wild-caught sockeye salmon. Naturally migratin...
متن کاملSea Louse Infection of Juvenile Sockeye Salmon in Relation to Marine Salmon Farms on Canada's West Coast
BACKGROUND Pathogens are growing threats to wildlife. The rapid growth of marine salmon farms over the past two decades has increased host abundance for pathogenic sea lice in coastal waters, and wild juvenile salmon swimming past farms are frequently infected with lice. Here we report the first investigation of the potential role of salmon farms in transmitting sea lice to juvenile sockeye sal...
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تاریخ انتشار 2009