Changes in the Population Ecology of Hatchery and Wild Coho Salmon in the Strait of Georgia

2008 ◽  
Vol 137 (2) ◽  
pp. 503-520 ◽  
Author(s):  
R. J. Beamish ◽  
R. M. Sweeting ◽  
K. L. Lange ◽  
C. M. Neville
Keyword(s):  
Population Ecology ◽  
Coho Salmon ◽  
Strait Of Georgia

Estimating the Abundance of Juvenile Coho Salmon in the Strait of Georgia by Means of Surface Trawls

2000 ◽  
Vol 20 (2) ◽  
pp. 369-375 ◽  
Author(s):  
R. J. Beamish ◽  
D. McCaughran ◽  
J. R. King ◽  
R. M. Sweeting ◽  
G. A. McFarlane
Keyword(s):  
Coho Salmon ◽  
Strait Of Georgia

Variation in Body Morphology Among British Columbia Populations of Coho Salmon, Oncorhynchus kisutch

1985 ◽  
Vol 42 (12) ◽  
pp. 2020-2028 ◽  
Author(s):  
Eric B. Taylor ◽  
J. D. McPhail
Keyword(s):  
British Columbia ◽  
Coho Salmon ◽  
Function Analysis ◽  
Oncorhynchus Kisutch ◽  
Fraser River ◽  
Strait Of Georgia ◽  
Coastal Streams ◽  
Morphological Differences ◽  
Median Fins ◽  
Coastal British Columbia

Ten populations of juvenile coho salmon, Oncorhynchus kisutch, from streams tributary to the upper Fraser River, the lower Fraser River, and the Strait of Georgia region were morphologically compared. Juveniles from coastal streams (Fraser River below Hell's Gate and the Strait of Georgia) were more robust (deeper bodies and caudal peduncles, shorter heads, and larger median fins) than interior Juveniles. Discriminant function analysis indicated that juvenile coho could be identified as to river of origin with 71% accuracy. Juvenile coho from coastal streams were less successfully classified as to stream of origin; however, juveniles could be successfully identified as either coastal or interior with 93% accuracy. Juvenile coho from north coastal British Columbia, Alaska, and the upper Columbia system also fitted this coastal and interior grouping. This suggests that a coastwide coastal–interior dichotomy in juvenile body form exists. Three populations (one interior and two coastal) were studied in more detail. In these populations the coastal versus interior morphology was consistent over successive years, and was also displayed in individuals reared from eggs in the laboratory. Adult coho salmon also showed some of the coastal–interior morphological differences exhibited by juveniles. We concluded that the morphological differences between coastal and interior coho salmon are at least partially inherited.

The Use of Acoustic Tags to Determine the Timing and Location of the Juvenile Coho Salmon Migration out of the Strait of Georgia, Canada

2009 ◽  
Vol 138 (6) ◽  
pp. 1220-1225 ◽  
Author(s):  
C. M. Chittenden ◽  
R. J. Beamish ◽  
C. M. Neville ◽  
R. M. Sweeting ◽  
R. S. McKinley
Keyword(s):  
Coho Salmon ◽  
Strait Of Georgia ◽  
Acoustic Tags

scholarly journals Effects of smolt release timing and size on the survival of hatchery-origin coho salmon in the Strait of Georgia

2013 ◽  
Vol 115 ◽  
pp. 111-118 ◽  
Author(s):  
J.R. Irvine ◽  
M. O’Neill ◽  
L. Godbout ◽  
J. Schnute
Keyword(s):  
Coho Salmon ◽  
Strait Of Georgia ◽  
Release Timing

Recent declines in the recreational catch of coho salmon (Oncorhynchus kisutch) in the Strait of Georgia are related to climate

1999 ◽  
Vol 56 (3) ◽  
pp. 506-515 ◽  
Author(s):  
R J Beamish ◽  
G A McFarlane ◽  
R E Thomson
Keyword(s):  
Coho Salmon ◽  
Global Climate ◽  
Oncorhynchus Kisutch ◽  
Climate Indices ◽  
Strait Of Georgia ◽  
Dramatic Decline ◽  
Westerly Winds ◽  
Ocean Conditions ◽  
Climate Events ◽  
The Impact

Wild and hatchery-reared coho salmon (Oncorhynchus kisutch) from streams and rivers that flow into the Strait of Georgia are caught in the Strait of Georgia and off the west coast of Vancouver Island. The percentage of coho caught in either of these two areas varies from year to year. The variation is associated with the flow of freshwater from the Fraser River and became more extreme in the 1990's. In four of eight years in the 1990's and in the past three years, most coho have been caught outside the Strait of Georgia. The dramatic decline in the sport catch in the Strait is related to ocean conditions in the Strait. The change in ocean conditions is related to an increase in the number of days of zonal (westerly) winds in October, November, and December and to an increase in relative sea level height. The climate change about 1989 that affected the pattern of winter winds and the circulation in the Strait of Georgia was associated with changes in other global climate indices, demonstrating the impact that global climate events can have on the dynamics of regional salmon stocks.

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