scholarly journals Lopsided Fish in the Snake River Basin – Fluctuating Asymmetry as a way of Assessing Impact of Hatchery Supplementation in Chinook Salmon, Oncorhynchus tshawytscha

2004 ◽  
Vol 69 (1-4) ◽  
pp. 379-393 ◽  
Author(s):  
Orlay Johnson ◽  
Kathleen Neely ◽  
Robin Waples
Keyword(s):  
River Basin ◽  
Fluctuating Asymmetry ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Snake River ◽  
Hatchery Supplementation

Movement and Spawner Distribution of Hatchery Fall Chinook Salmon Adults Acclimated and Released as Yearlings at Three Locations in the Snake River Basin

2004 ◽  
Vol 24 (4) ◽  
pp. 1134-1144 ◽  
Author(s):  
Aaron P. Garcia ◽  
William P. Connor ◽  
Deborah J. Milks ◽  
Stephen J. Rocklage ◽  
R. Kirk Steinhorst
Keyword(s):  
River Basin ◽  
Chinook Salmon ◽  
Snake River

scholarly journals Fall Chinook Salmon Spawning Ground Surveys in the Snake River Basin Upriver of Lower Granite Dam, 2004 Annual Report.

2005 ◽  
Author(s):  
A.P. Garcia ◽  
S. Bradbury ◽  
B.D. Arnsberg ◽  
S.J. Rocklage ◽  
P.A. Groves
Keyword(s):  
River Basin ◽  
Chinook Salmon ◽  
Annual Report ◽  
Snake River ◽  
Spawning Ground

Within-river straying: sex and size influence recovery location of hatchery Chinook salmon (Oncorhynchus tshawytscha)

2020 ◽  
Vol 77 (2) ◽  
pp. 226-235 ◽  
Author(s):  
Amanda M.M. Pollock ◽  
Maryam Kamran ◽  
Andrew H. Dittman ◽  
Marc A. Johnson ◽  
David L.G. Noakes
Keyword(s):  
River Basin ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Classification Tree ◽  
River System ◽  
Classification Tree Analysis ◽  
Spawning Grounds ◽  
Natural Origin ◽  
Elk River ◽  
In The Wild

Salmon straying is often defined as the failure of adults to return to their natal river system. However, straying within a river basin can be problematic if hatchery salmon do not return to their hatchery of origin and subsequently spawn in the wild with natural-origin salmon. We examined within-river straying patterns from 34 years of coded-wire tag data, representing 29 941 hatchery fall Chinook salmon (Oncorhynchus tshawytscha) in the Elk River, Oregon, USA. Using classification tree analysis, we found that females and larger salmon were more likely to be recovered on the spawning grounds than males and smaller fish. Females larger than 980 mm had a 51.6% likelihood of recovery on the spawning grounds rather than at the Elk River Hatchery. Our findings raise questions about the behavior of straying adults and implications for management of these stocks, with a focus on methods to reduce within-river straying. We recommend further studies to determine whether carcass recoveries are fully representative of hatchery salmon that stray within the Elk River basin.

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