scholarly journals Stock Assessment of Columbia River Anadromous Salmonids : Final Report, Volume I, Chinook, Coho, Chum and Sockeye Salmon Summaries.

1986 ◽  
Author(s):  
Philip J. Howell
Keyword(s):  
Sockeye Salmon ◽  
Stock Assessment ◽  
Columbia River ◽  
Final Report

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

1997 ◽  
Vol 54 (6) ◽  
pp. 1349-1360 ◽  
Author(s):  
Thomas P Quinn ◽  
Sayre Hodgson ◽  
Charles Peven
Keyword(s):  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Columbia River ◽  
Water Velocity ◽  
River Ice ◽  
Snake River ◽  
Arrival Date ◽  
Temperature Regimes ◽  
Arrival Timing ◽  
Travel Rate

We related the arrival timing of adult sockeye salmon (Oncorhynchus nerka) at a series of dams on the Columbia River (Bonneville, McNary, and Rock Island) and Snake River (Ice Harbor) to the changing flow and temperature regimes over the last several decades. The temperatures experienced by sockeye salmon have increased in the lower but not upper reaches of the system, and the flows experienced by the fish have decreased. The Bonneville-McNary travel rate increased from about 22 to 49 km/day, and sockeye salmon now pass McNary Dam about 11 days earlier than in 1954. Both travel rate and arrival date were correlated with temperature increases and flow decreases at McNary during that period. Sockeye salmon arrival at Rock Island Dam (14 days earlier from 1933 to 1994) was also correlated with temperature and flow there. However, 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. Sockeye salmon arrival at Ice Harbor Dam has sometimes been bimodal; the first mode's date has not changed, but annual mean dates have been positively correlated with flow and negatively with temperature.

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.

scholarly journals Lower Columbia River and Estuary Ecosystem Restoration Program Reference Site Study: 2011 Restoration Analysis - FINAL REPORT

2012 ◽  
Author(s):  
Amy B. Borde ◽  
Valerie I. Cullinan ◽  
Heida L. Diefenderfer ◽  
Ronald M. Thom ◽  
Ronald M. Kaufmann ◽  
...  
Keyword(s):  
Reference Site ◽  
Ecosystem Restoration ◽  
Columbia River ◽  
Final Report
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