Abnormal Migration Timing and High en route Mortality of Sockeye Salmon in the Fraser River, British Columbia

  title={Abnormal Migration Timing and High en route Mortality of Sockeye Salmon in the Fraser River, British Columbia},
  author={Steven J. Cooke and Scott G. Hinch and Anthony P. Farrell and Mike Lapointe and Simon R M Jones and J. Stevenson Macdonald and David A. Patterson and Michael C. Healey and Glen Van Der Kraak},
Abstract Since 1995, several stocks of Fraser River sockeye salmon (Oncorhynchus nerka) have begun upriver spawning migrations significantly earlier than previously observed. In some years, the timing of peak migration has shifted more than 6 weeks. Coincident with this early migration are high levels of en route and pre-spawning mortality, occasionally exceeding 90%. These phenomena pose risks to the perpetuation of these fisheries resources. At present, although there are many competing… 

Figures and Tables from this paper

Temperature‐mediated en route migration mortality and travel rates of endangered Snake River sockeye salmon

Temperature- and condition-related adult mortality in Columbia and Fraser River sockeye salmon populations parallel and suggest increased risk for fish in poor initial condition and probable recent selection against late-timed salmon.

Physiology of individual late-run Fraser River sockeye salmon (Oncorhynchus nerka) sampled in the ocean correlates with fate during spawning migration

Differences in physi- ological and energetic status may be associated with high en route mortality in late-run sockeye salmon.

Migration Trends of Sockeye Salmon at the Northern Edge of Their Distribution

AbstractClimate change is affecting arctic and subarctic ecosystems, and anadromous fish such as Pacific salmon Oncorhynchus spp. are particularly susceptible due to the physiological challenge of

Physiological correlates of coastal arrival and river entry timing in late summer Fraser River sockeye salmon (Oncorhynchus nerka)

The first assessment of the physiological correlates of migration timing is provided and a mechanistic understanding of the proximate factors associated with abnormal migration timing in late-run sockeye salmon is provided.

Physiological and energetic correlates of en route mortality for abnormally early migrating adult sockeye salmon (Oncorhynchus nerka) in the Thompson River, British Columbia

Energy depletion, premature reproductive development, and blood loss from wounds as potential contributors to mortality in early migrating late-run sockeye are implicate.

Mechanistic basis of individual mortality in Pacific salmon during spawning migrations.

The predictions that the fish that died prematurely would be characterized by low energy reserves, advanced reproductive development, elevated indicators of stress, and low osmoregulatory preparedness compared with fish that completed their river migration were tested.

Condition‐Dependent En Route Migration Mortality of Adult Chinook Salmon in the Willamette River Main Stem

Migration mortality for 762 radio-tagged adults along a ~260-km reach of the main stem of the Willamette River confirmed concerns about mortality in the migration corridor, and injuries to adult Chinook Salmon were linked to reduced survival during migration to tributaries.

Dead fish swimming: a review of research on the early migration and high premature mortality in adult Fraser River sockeye salmon Oncorhynchus nerka.

The Fraser River late-run O. nerka early migration phenomenon illustrates the complex links that exist between salmonid physiology, behaviour and environment and the pivotal role that water temperature can have on population-specific migration survival.

Modeling the Influence of Environmental Factors on Spawning Migration Mortality for Sockeye Salmon Fisheries Management in the Fraser River, British Columbia

Abstract The impact of freshwater environmental factors on spawning migration mortality was modeled to provide a predictive tool for fisheries management of four run timing groups of Fraser River

High river temperature reduces survival of sockeye salmon (Oncorhynchus nerka) approaching spawning grounds and exacerbates female mortality

Female and male survival differed but only when they experienced warm river temperatures, and it is suspected that females could be immuno- compromised and thus less resistant to pathogens whose rates of development are accelerated by warm temperatures.



Environmental Changes Affecting the Migratory Timing of American Shad and Sockeye Salmon

It is hypothesized that American shad and sockeye salmon may have evolved a migratory pattern that allows greater behavioral response to environmental fluctuations than sockeye Salmon, which spawn in distant lo- cations many months after their upriver migration.

Temperature, flow, and the migration of adult sockeye salmon (Oncorhynchus nerka) in the Columbia River

The travel rate between McNary and Rock Island dams did not change from 1955 to 1994, despite a decrease in estimated water velocity from 85 to 23 km/day, and both travel rate and arrival date were correlated with temperature increases and flow decreases at McNary during that period.

Production of Fraser River sockeye salmon (Oncorhynchus nerka) in relation to decadal-scale changes in the climate and the ocean

The response of Fraser River sockeye to climate changes may be a specific example of a more general response by a number of species of fishes in the Pacific and perhaps in other oceans.


Anadromous Pacific salmon (Oncorhynchus spp.) transport marine-derived nitrogen (MDN) to the rivers in which they reproduce. Isotopic analyses indicate that trees and shrubs near spawning streams

Pacific Salmon, Nutrients, and the Dynamics of Freshwater and Riparian Ecosystems

Pacific salmon (Oncorhynchus spp.) accumulate substantial nutrients in their bodies as they grow to adulthood at sea. These nutrients are carried to predominantly oligotrophic lakes and streams,

Current controversies in the study of salmon homing

Four topics in the study of homing mechanisms which are presently unresolved or controversial are reviewed, including the migration from open ocean to coastal waters; tagging studies and correlations between ocean temperatures and migratory timing are in conflict regarding the possibility of true navigation by salmon.

The influence of ocean currents on latitude of landfall and migration speed of sockeye salmon returning to the Fraser River

We hypothesize that the interannual variability of the Northeast Pacific Ocean circulation affects the latitude of landfall and migration speed of adult sockeye salmon (Oncorhynchus nerka) returning

Epizootiology of Parvicapsula minibicornis in Fraser River sockeye salmon, Oncorhynchus nerka (Walbaum)

In both 1999 and 2000 the parasite was present in all Fraser River sockeye salmon stocks sampled, which suggests that early Stuart salmon may be valuable as a sentinel stock for the presence of the parasite in later-spawning stocks.

Renal infestation with Parvicapsula minibicornis in wild sockeye salmon from the Harrison and Adams rivers in British Columbia.

Renal infestation with Parvicapsula minibicornis in wild sockeye salmon from the Harrison and Adams rivers in British Columbia ockeye salmon (Onchorhynchus nerka) is 1 of 7 wild Pacific salmon

Homing behavior and vertical movements of four species of Pacific salmon (Oncorhynchus spp.) in the central Bering Sea

Sockeye, chum, and pink salmon showed strong surface preferences but chinook salmon swam deeper than did the other species and suggested that salmon had a compass orientation ability functioning without celestial information.