scholarly journals Effects of Iron Gate Dam discharge and other factors on the survival and migration of juvenile coho salmon in the lower Klamath River, northern California, 2006-09

2012 ◽  
pp. i-96 ◽  
Author(s):  
John Beeman ◽  
Steven Juhnke ◽  
Greg Stutzer ◽  
Katrina Wright
Keyword(s):  
Coho Salmon ◽  
Northern California ◽  
Klamath River ◽  
Iron Gate ◽  
And Migration

Overripening as the cause of low survival to hatch in Lake Erie coho salmon (Oncorhynchus kisutch) embryos

1996 ◽  
Vol 74 (5) ◽  
pp. 851-857 ◽  
Author(s):  
P. A. Flett ◽  
G. Van Der Kraak ◽  
K. R. Munkittrick ◽  
J. F. Leatherland
Keyword(s):  
Lake Erie ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Low Fertility ◽  
Genetic Origin ◽  
Salmon Stock ◽  
And Migration ◽  
Cross Fertilization ◽  
Egg Fertility ◽  
Poor Fertilization

We investigated the cause of the low survival to hatch of embryos of coho salmon (Oncorhynchus kisutch) from the Fairview, Pennsylvania, stock in Lake Erie. In 1988, survival to hatch of this stock was only 42%, whereas another Great Lakes coho salmon stock of similar genetic origin had an 84% survival to hatch. Laboratory cross-fertilization studies between the Fairview stock and a reference Lake Erie stock from Simcoe, Ontario, showed that eggs from the Fairview stock were the probable source of the low fertility. The presence of overripe eggs in Fairview females was associated with poor fertilization and low survival to hatch. Plasma gonadotropin II levels were similar in preovulatory females taken from the Fairview and Simcoe stocks, but testosterone and 17α, 20β-dihydroxy-4-pregnen-3-one levels were significantly lower in the Fairview females. Increasing the triiodo-L-thyronine (T3) content of the eggs by the administration of T3 to the preovulatory females did not enhance egg fertility. We propose that the low survival to hatch of the Fairview embryos is due to delayed oocyte maturation and ovulation and vent maturation, which may have been caused by exposure of the Fairview salmon to warmer water during the period of late ovarian maturation and migration.

scholarly journals Effects of subsidies from spawning chum and pink salmon on juvenile coho salmon body size and migration timing

Ecosphere ◽  
2015 ◽  
Vol 6 (10) ◽  
pp. art209-art209 ◽  
Author(s):  
Michelle C. Nelson ◽  
John D. Reynolds
Keyword(s):  
Body Size ◽  
Coho Salmon ◽  
Pink Salmon ◽  
Migration Timing ◽  
And Migration

scholarly journals Stock-Specific Size and Migration of Juvenile Coho Salmon in British Columbia and Southeast Alaska Waters

2016 ◽  
Vol 8 (1) ◽  
pp. 292-314 ◽  
Author(s):  
Terry D. Beacham ◽  
Richard J. Beamish ◽  
Chrys M. Neville ◽  
John R. Candy ◽  
Colin Wallace ◽  
...  
Keyword(s):  
British Columbia ◽  
Coho Salmon ◽  
Southeast Alaska ◽  
And Migration

Effect of lunar-phased releases on adult recovery of coho salmon from Trinity River and Iron Gate hatcheries in California

Aquaculture ◽  
1989 ◽  
Vol 82 (1-4) ◽  
pp. 355-365 ◽  
Author(s):  
Richard S. Nishioka ◽  
E.Gordon Grau ◽  
Howard A. Bern ◽  
Richard J. Lin ◽  
Paul M. Hubbell ◽  
...  
Keyword(s):  
Coho Salmon ◽  
Trinity River ◽  
Iron Gate
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