The application of recent smoltification research to public hatchery releases: An assessment of size/time requirements for Columbia River hatchery coho salmon (Oncorhynchus kisutch)

Aquaculture ◽  
1982 ◽  
Vol 28 (1-2) ◽  
pp. 251-268 ◽  
Author(s):  
Conrad Mahnken ◽  
Earl Prentice ◽  
William Waknitz ◽  
Gerald Monan ◽  
Carl Sims ◽  
...  
Keyword(s):  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Columbia River ◽  
Time Requirements

Spatiotemporal patterns in migration timing of coho salmon (Oncorhynchus kisutch) smolts in North America

2010 ◽  
Vol 67 (8) ◽  
pp. 1316-1334 ◽  
Author(s):  
Brian C. Spence ◽  
James D. Hall
Keyword(s):  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Columbia River ◽  
Life Transition ◽  
Regional Patterns ◽  
Migration Patterns ◽  
Watershed Characteristics ◽  
Migration Timing ◽  
Queen Charlotte Islands ◽  
Kodiak Island

The timing of ocean entry by salmon smolts is presumed adaptive to maximize survival during this critical life transition. We analyzed the peak timing, duration, and interannual variation in timing of smolt migrations for 53 coho salmon ( Oncorhynchus kisutch ) populations from central California to Kodiak Island, Alaska. The objective was to examine potential influences of both local watershed characteristics and larger-scale processes in the marine environment on smolt migration patterns. Multivariate analyses demonstrated a strong latitudinal gradient in migration patterns with trends toward later, shorter, and more predictable migrations with increasing latitude. Cluster analysis performed on migration descriptors indicated three major population groupings that coincide with major coastal oceanic regions in the northeast Pacific: a northern group from Kodiak Island to the Queen Charlotte Islands, British Columbia, a central group from the Queen Charlotte Islands south to the Columbia River, and a southern group from the Columbia River southward. These regional patterns transcended local variability associated with watershed characteristics and trap location, suggesting that the patterns reflect adaptation to differences in timing and relative predictability of favorable conditions in the marine environments that smolts enter.

Transferrin Polymorphism in Coho Salmon (Oncorhynchus kisutch)

1970 ◽  
Vol 27 (12) ◽  
pp. 2371-2373 ◽  
Author(s):  
Fred M. Utter ◽  
Warren E. Ames ◽  
Harold O. Hodgins
Keyword(s):  
Coho Salmon ◽  
Puget Sound ◽  
Oncorhynchus Kisutch ◽  
Columbia River ◽  
Single Locus ◽  
Potential Usefulness ◽  
Stock Identification ◽  
Transferrin Polymorphism

Six transferrin phenotypes observed in sera of coho salmon (Oncorhynchus kisutch) were interpreted as a reflection of three alleles — TfA, TfB, and TfC — at a single locus. The distribution of these alleles differed significantly among samples collected from streams entering Puget Sound and tributaries of the Columbia River, suggesting a potential usefulness of this system for stock identification.

Survival, Contribution, and Return of Hatchery Coho Salmon (Oncorhynchus kisutch) Released into Freshwater, Estuarine, and Marine Environments

1991 ◽  
Vol 48 (2) ◽  
pp. 248-253 ◽  
Author(s):  
Mario F. Solazzi ◽  
Thomas E. Nickelson ◽  
Steven L. Johnson
Keyword(s):  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Columbia River ◽  
Fold Increase ◽  
Coast Guard ◽  
Control Group ◽  
Survival Index ◽  
Significant Difference ◽  
Columbia River Plume ◽  
Brood Fish

We released six groups of marked yearling hatchery coho salmon (Oncorhynchus kisutch) in six locations each year for five years beginning with the 1981 brood. Fish were released immediately below Bonneville Dam (control), at the Tongue Point Coast Guard Station (head of saltwater intrusion in the Columbia River), between the jetties at the Columbia River bar, in the Columbia River plume water, in coastal water approximately 19 km north and 19 km offshore of the mouth of the river, and in oceanic water approximately 38 km offshore. We found a 1.6-fold increase in the survival index (ocean catch through September 18 each year) for the fish released at Tongue Point compared with the control group. After adjusting for differences in the survival index between release groups, we found a 2.5-fold increase in the contribution to the Columbia River gillnet fishery from the fish released at Tongue Point compared with the control group. We found no significant difference between survival of the other release groups and survival of the control group. We also found that the percentage of adult fish that returned to locations other than the Columbia basin increased as the distance the fish were transported offshore increased.

Induced ovulation in coho salmon (Oncorhynchus kisutch). I. Further studies on the use of salmon pituitary preparations

Aquaculture ◽  
1981 ◽  
Vol 26 (1-2) ◽  
pp. 117-127 ◽  
Author(s):  
George A. Hunter ◽  
Edward M. Donaldson ◽  
Helen M. Dye
Keyword(s):  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Induced Ovulation

Physiological Response of Juvenile Coho Salmon (Oncorhynchus kisutch) and Rainbow Trout (Salmo gairdneri) to Handling and Crowding Stress in Intensive Fish Culture

1976 ◽  
Vol 33 (12) ◽  
pp. 2699-2702 ◽  
Author(s):  
Gary A. Wedemeyer
Keyword(s):  
Rainbow Trout ◽  
Feeding Behavior ◽  
Coho Salmon ◽  
Physiological Stress ◽  
Oncorhynchus Kisutch ◽  
Fish Distribution ◽  
Salmo Gairdneri ◽  
Crowding Stress ◽  
Normal Feeding ◽  
Intensive Fish Culture

Moving 4–5-in. coho salmon (Oncorhynchus kisutch) held in soft (20 ppm CaCO3) water from the relatively light loading density of 0.5 lb/ft3 to 1, 2, or 4 lb/ft3 (density index, DI = 0.1, 0.2, 0.4, 0.8) caused significant stress as indicated by loss of feeding behavior, but only minimal physiological disturbances, as indicated by lack of hyperglycemia or hypochloremia. However, moving them to 6 or 12 lb/ft3 (DI = 1.2, 2.4) caused significant physiological stress which required at least a week for recovery. Smolting coho salmon were physiologically stressed by population densities of 1 lb/ft3 or more and a subclinical corynebacterial kidney infection was activated. Rainbow trout (Salmo gairdneri) (4–5 in.) were physiologically stressed when moved and held at 1 lb/ft3 or more but retained normal feeding behavior. This indicates that handling and crowding stress will be minimized in softwater areas if densities in fish distribution trucks or in ponds or raceways during disease treatments are held to 0.1–0.5 lb/gal.

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