Mechanisms Influencing the Timing and Success of Reproductive Migration in a Capital Breeding Semelparous Fish Species, the Sockeye Salmon

  title={Mechanisms Influencing the Timing and Success of Reproductive Migration in a Capital Breeding Semelparous Fish Species, the Sockeye Salmon},
  author={Glenn T. Crossin and Scott G. Hinch and Steven J. Cooke and Michael S Cooperman and David A. Patterson and David W. Welch and Kyle C. Hanson and Ivan Olsson and Karl K. English and Anthony P. Farrell},
  journal={Physiological and Biochemical Zoology},
  pages={635 - 652}
Two populations of homing sockeye salmon (Oncorhynchus nerka; Adams and Chilko) were intercepted in the marine approaches around the northern and southern ends of Vancouver Island (British Columbia, Canada) en route to a natal river. More than 500 salmon were nonlethally biopsied for blood plasma, gill filament tips, and gross somatic energy (GSE) and were released with either acoustic or radio transmitters. At the time of capture, GSE, body length, and circulating testosterone ([T]) differed… 
Condition dependence in the marine exit timing of sockeye salmon (Oncorhynchus nerka) returning to Copper Creek, Haida Gwaii
It is found individuals with early marine exit had higher growth rates in the months prior to river entry, had greater lipid density, and were more likely male, more likely of the 2.2 versus 1.2 age class.
Effects of natal water concentration and temperature on the behaviour of up-river migrating sockeye salmon
There were few associations between metabolic stress indices and reproductive hormone levels with this behaviour in either population; however, higher temperatures and elevated natal water concentrations in the Seton River were associated with shorter powerhouse delays and less wandering in late-run migrants.
Thermal regime, predation danger and the early marine exit of sockeye salmon Oncorhynchus nerka.
The data presented here appear inconsistent with thermal avoidance as an explanation for the early marine exit timing in Copper Creek and in three other populations on the Haida Gwaii Archipelago with early marineexit.
Environmental conditions and physiological state influence estuarine movements of homing sockeye salmon
It is proposed that wind-induced currents exposed sockeye salmon entering the estuary to stronger olfactory cues associated with Fraser River water, which resulted in faster migration rates presumably due to either an increased ability for olfatory navigation and/or advanced reproductive schedule through a neuroendocrine response to olfitory cues.
Physiological Condition Differentially Affects the Behavior and Survival of Two Populations of Sockeye Salmon during Their Freshwater Spawning Migration
It is concluded that physiological condition differentially affects the behavior and survival of these two populations, which may be a consequence of the early‐entry phenomenon by a segment of the Adams‐Shuswap population.
The critical importance of an undammed river segment to the reproductive cycle of a migratory Neotropical fish
Examining the migratory and reproductive dynamics of Prochilodus costatus in the Sao Francisco River watershed, south‐east Brazil, by comparing the ecological importance of two rivers to the species shows the key role of undammed river segments for the conservation of Neotropic migratory fish species.
Characterizing Migration Behaviour of Adult Fraser River Sockeye Salmon (Oncorhynchus nerka) During Costal and Estuarian Passage Using Acceleration Transmitters
Though behaviour during the reproductive migration of Pacific salmon (Oncorhynchus spp.) has been studied during upriver migrations, equivalent information for coastal marine migrations has been
Coastal marine and in-river migration behaviour of adult sockeye salmon en route to spawning grounds
Overall this study demonstrates that using acoustic accelerometer transmitters can provide valuable insights into behaviour of homing sockeye salmon in both marine and freshwater environments.


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.
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.
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.
Individual Variation in Migration Speed of Upriver‐Migrating Sockeye Salmon in the Fraser River in Relation to Their Physiological and Energetic Status at Marine Approach
It is suggested that there could be extensive variation in migration behavior among individuals, sexes, and populations and that physiological condition in the ocean explained little of this variation relative to in‐river environmental conditions and energetic status.
Behaviour and physiology of sockeye salmon homing through coastal waters to a natal river
From point of release to the river mouth, males migrated faster than females, but once in river migration rates did not differ between sexes, and a correlation was discovered between levels of circulating testosterone and river entry timing among all females.
Exposure to high temperature influences the behaviour, physiology, and survival of sockeye salmon during spawning migration
Since 1996, some populations of Fraser River sockeye salmon (Oncorhynchus nerkaWalbaum in Artedi, 1792) have begun spawning migrations weeks earlier than normal, and most perish en route as a result.
Abnormal Migration Timing and High en route Mortality of Sockeye Salmon in the Fraser River, British Columbia
Since 1995, several stocks of Fraser River sockeye salmon have begun upriver spawning migrations significantly earlier than previously observed, with high levels of en route and pre-spawning mortality, occasionally exceeding 90%.
Energetics and morphology of sockeye salmon: effects of upriver migratory distance and elevation
Despite large among-population differences in somatic energy at the start of upriver migration, all populations completed migration and spawning, and subsequently died, with c.
Metabolic rates and swimming performance of adult Fraser River sockeye salmon (Oncorhynchus nerka) after a controlled infection with Parvicapsula minibicornis
Adult sockeye salmon (Oncorhynchus nerka) acquire infections with the myxosporean kidney parasite Parvicapsula minibicornis during their spawning migration in the Fraser River, British Columbia.