scholarly journals Linking Freshwater Environmental Factors to Up-river Migration Timing of Fraser River Chinook Salmon

2019 ◽  
pp. 16-18
Author(s):  
Kaitlyn Dionne ◽  
Chuck Parken ◽  
Brittany Jenewein
Keyword(s):  
Environmental Factors ◽  
Chinook Salmon ◽  
Fraser River ◽  
Migration Timing ◽  
River Migration

scholarly journals Variation in Out-migration Timing and Estuary Reliance of “ocean-type” Chinook Salmon in the Fraser River Estuary, BC

2019 ◽  
pp. 25-27
Author(s):  
David Scott ◽  
Lia Chalifour ◽  
Misty MacDuffee ◽  
Julia Baum ◽  
Scott Hinch
Keyword(s):  
Chinook Salmon ◽  
River Estuary ◽  
Fraser River ◽  
Migration Timing

An Evaluation of Rearing Densities to Improve Growth and Survival of Hatchery Spring Chinook Salmon

2013 ◽  
Vol 4 (1) ◽  
pp. 114-123 ◽  
Author(s):  
Douglas E. Olson ◽  
Michael Paiya
Keyword(s):  
Mortality Rate ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Confounding Factor ◽  
Fork Length ◽  
High Density ◽  
Growth And Survival ◽  
Migration Timing ◽  
Rearing Density ◽  
Salmon Stock

Abstract We evaluated growth and survival of spring Chinook salmon Oncorhynchus tshawytscha reared at varying densities at Warm Springs National Fish Hatchery, Oregon. For three consecutive brood years, density treatments consisted of low, medium, and high groups in 57.8-m3 raceways with approximately 16,000, 24,000, and 32,000 fish/raceway, respectively. Fish were volitionally released in both the autumn and spring to mimic the downstream migration timing of the endemic wild spring Chinook salmon stock. Just prior to the autumn release, the rearing density estimate was 4.24 kg/m3 for the low-density group, 6.27 kg/m3 for the medium-density group, and 8.42 kg/m3 for the high-density group. While weight gain did not differ among density treatments (P  =  0.72), significant differences were found in median fork length (P < 0.001) for fish reared at different densities. Fish reared at high density exhibited the highest on-hatchery mortality rate during two brood years; however, differences in mortality rate among densities were not significant (P  =  0.20). In one brood year, adult recovery rates appeared to support the hypothesis that lower initial densities improved postrelease survival (P < 0.01). All rearing densities utilized in this evaluation were relatively low and may partially explain why more differences were not readily apparent among density groups. In addition, the volitional release was a confounding factor in our study because we were unable to quantify the number of fish released in the autumn.

Susceptibility of six Fraser chinook salmon stocks to Ceratomyxa shasta and the effects of salinity on ceratomyxosis

1984 ◽  
Vol 62 (6) ◽  
pp. 1081-1083 ◽  
Author(s):  
Hilda Lei Ching ◽  
D. R. Munday
Keyword(s):  
Chinook Salmon ◽  
Drainage System ◽  
Infected Fish ◽  
Estuarine Environment ◽  
Fish Stock ◽  
Fraser River ◽  
Time Of Death ◽  
Juvenile Chinook Salmon ◽  
Juvenile Chinook ◽  
High Level

Juvenile chinook salmon representing six stocks from the Fraser River drainage system were tested for susceptibility to the myxozoan pathogen, Ceratomyxa shasta. Of the six stocks tested, three were collected from the Nechako, Quesnel, and Clearwater rivers and three were hatchery stocks originating from Slim Creek and the Bowron and Birkenhead rivers. Of 302 fish exposed in August 1982, 95% became infected and died of ceratomyxosis. Susceptibility was high and time of death varied with the fish stock. High river temperatures during the 10 days of exposure and a high level of abundance of infectious C. shasta contributed to high mortalities of fish. Results of maintenance of infected fish in seawater indicated that ceratomyxosis is not attenuated and fish will continue to die after entering the estuarine environment.

Bioconcentration of Chlorophenols by Early Life Stages of Fraser River Pink and Chinook Salmon (Oncorhynchus gorbuscha, O. tshawytscha)

1988 ◽  
Vol 23 (1) ◽  
pp. 88-99 ◽  
Author(s):  
James A. Servizi ◽  
Robert W. Gordon ◽  
John H. Carey
Keyword(s):  
Chinook Salmon ◽  
Pink Salmon ◽  
Paper Mill ◽  
Oncorhynchus Gorbuscha ◽  
Fraser River ◽  
Life Stages ◽  
Early Life Stages ◽  
Pulp And Paper Mill ◽  
Paper Mill Effluents ◽  
Salmon Fry

Abstract Chlorophenol content of emergent pink salmon fry from five natal spawning grounds and fingerling Chinook from the Fraser River was determined. Major Chlorophenols identified were pentachlorophenol, 2,3,4,6-tetrachlorophenol, 2,4,6-trichlorophenol and 2,4-dichlorophenol. Sources of these compounds appear to be lumber mills using chlorophenol based fungicides and pulp and paper mill effluents. Chlorophenol content was greatest in pink salmon fry from the Thompson River (58.4 ng/g total Chlorophenols). Fingerling Chinook from the Fraser River contained 3 7.7 ng/g total Chlorophenols. The 96-hr LC50 of Woodbrite 24, a chlorophenol based fungicide to pink salmon during the egg-to-fry stage was determined to be in the 100 to 150 ug/L range. This range is about 100 times higher than average levels reported for Fraser River water.

Functional gene diversity and migration timing in reintroduced Chinook salmon

2015 ◽  
Vol 16 (6) ◽  
pp. 1455-1464 ◽  
Author(s):  
Melissa L. Evans ◽  
Samuel J. Shry ◽  
Dave P. Jacobson ◽  
Nicholas M. Sard ◽  
Kathleen G. O’Malley
Keyword(s):  
Chinook Salmon ◽  
Gene Diversity ◽  
Functional Gene ◽  
Migration Timing ◽  
Functional Gene Diversity ◽  
And Migration

Individual variation in dispersal behaviour of newly emerged chinook salmon (Oncorhynchus tshawytscha) from the Upper Fraser River, British Columbia

1997 ◽  
Vol 54 (7) ◽  
pp. 1585-1592 ◽  
Author(s):  
M J Bradford ◽  
G C Taylor
Keyword(s):  
British Columbia ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Population Variation ◽  
Fraser River ◽  
Movement Behaviour ◽  
Spawning Areas ◽  
Dispersal Distances ◽  
Stream Type ◽  
Downstream Movement

Immediately after emergence from spawning gravels, fry of stream-type chinook salmon (Oncorhynchus tshawytscha) populations from tributaries of the upper Fraser River, British Columbia, distribute themselves downstream from the spawning areas, throughout the natal stream, and into the Fraser River. We tested the hypothesis that this range in dispersal distances is caused by innate differences in nocturnal migratory tendency among individuals. Using an experimental stream channel, we found repeatable differences in downstream movement behaviour among newly emerged chinook fry. Fish that moved downstream were larger than those that held position in the channel. However, the incidence of downstream movement behaviours decreased over the first 2 weeks after emergence. We propose that the variation among individuals in downstream movement behaviour we observed leads to the dispersal of newly emerged fry throughout all available rearing habitats. Thus, between- and within-population variation in the freshwater life history observed in these populations may be caused by small differences in the behaviour of individuals.

Migration Timing of Adult Chinook Salmon into the Togiak River, Alaska, Watershed: Is There Evidence for Stock Structure?

2015 ◽  
Vol 144 (4) ◽  
pp. 829-836 ◽  
Author(s):  
Sydney C. Clark ◽  
Theresa L. Tanner ◽  
Suresh A. Sethi ◽  
Kale T. Bentley ◽  
Daniel E. Schindler
Keyword(s):  
Chinook Salmon ◽  
Stock Structure ◽  
Migration Timing

scholarly journals Modelling salmon migration as a mixture problem

2019 ◽  
Vol 76 (6) ◽  
pp. 856-870 ◽  
Author(s):  
Skip McKinnell
Keyword(s):  
Chinook Salmon ◽  
Sockeye Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Simulated Data ◽  
Columbia River ◽  
Single Pulse ◽  
Model Complexity ◽  
Fraser River ◽  
The Individual ◽  
Large Adult

Pulses of abundance in salmon migrations can arise from single populations arriving at different times, from multiple populations with different timing characteristics, or as a combination of these. Daily observations typically record an aggregate measure of abundance passing some location rather than the abundances of the individual components. An objective method is described that partitions a compound migration into its component parts by exploiting differences in the characteristics of each pulse. Simulated data were used to demonstrate when greater model complexity may be desirable. Three case studies of increasing complexity (Chilko Lake sockeye salmon smolts (Oncorhynchus nerka), large adult Columbia River Chinook salmon (Oncorhynchus tshawytscha), Fraser River salmon test fishery) demonstrate how the model can be applied in practice. Results indicated that Chilko Lake smolts rarely emigrate to sea as a single pulse, that the dates used to distinguish the spring run of Chinook salmon in the Columbia River may be overestimating its abundance, and that pulses of sockeye salmon abundance in a Fraser River ocean test fishery in 2014 may have arisen from some factor other than population composition.

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