Fate of Coho Salmon (Oncorhynchus kisutch) Carcasses in Spawning Streams

1989 ◽  
Vol 46 (8) ◽  
pp. 1347-1355 ◽  
Author(s):  
C. J. Cederholm ◽  
D. B. Houston ◽  
D. L. Cole ◽  
W. J. Scarlett
Keyword(s):  
Food Webs ◽  
Human Activities ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Olympic Peninsula ◽  
Streams And Rivers ◽  
Organic Debris ◽  
Spawning Streams

We examined the levels of retention and utilization of 945 coho salmon (Oncorhynchus kisutch) carcasses released experimentally into seven spawning streams on the Olympic Peninsula, Washington. Most carcasses were retained in the streams and in adjacent forests, few were flushed beyond 600 m. Organic debris caught and held many carcasses. Much of the fish mass was consumed by 22 species of mammals and birds. The distances that carcasses drifted appeared to be related directly to the occurrence of freshets and inversely to debris load and carnivore scavenging. The capacity of many streams and rivers to retain carcasses has probably been reduced by human activities. The importance of coho carcasses to populations of carnivores and to the dynamics of lotic food webs merits additional study.

The Retention of Coho Salmon (Oncorhynchus kisutch) Carcasses by Organic Debris in Small Streams

1985 ◽  
Vol 42 (6) ◽  
pp. 1222-1225 ◽  
Author(s):  
C J. Cederholm ◽  
N. P. Peterson
Keyword(s):  
Riparian Zone ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Release Site ◽  
Positive Trend ◽  
Stream Channel ◽  
Olympic Peninsula ◽  
Spawning Period ◽  
Organic Debris ◽  
Small Streams

Twenty marked coho salmon (Oncorhynchus kisutch) carcasses were placed in each of nine small streams on the Olympic Peninsula of Washington during the fall–winter spawning period. Distribution of the carcasses in 500 m of stream below each release site was followed for 4 wk. One week after placement, 78 of the 180 carcasses were found in the nine study reaches; 80% were found in the first 200 m downstream of the release sites. A general positive trend was observed between the number of carcasses retained and the amount of debris in the stream channel (r = 0.61). Terrestrial animals rapidly consumed carcasses during the experiment, and removed many of them to the riparian zone.

Immigration of Juvenile Coho Salmon (Oncorhynchus kisutch) into Riverine Ponds

1982 ◽  
Vol 39 (9) ◽  
pp. 1308-1310 ◽  
Author(s):  
N. P. Peterson
Keyword(s):  
Habitat Management ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Large River ◽  
Production Potential ◽  
Olympic Peninsula ◽  
Clearwater River

Riverine ponds on the Olympic Peninsula provide important winter refuge for juvenile coho salmon (Oncorhynchus kisutch). A total of 9530 juvenile coho migrated into two riverine ponds of the Clearwater River in 1977, principally during fall freshets. Extensive movement by marked fish (as much as 32.6 km downstream) before entering the ponds suggests that a system-wide approach to habitat management is important in maintaining freshwater production potential of large river systems.Key words: juvenile coho, immigration, winter behavior, migration, freshet, pond

Vertical Distribution of Sediment and Organic Debris in Coho Salmon (Oncorhynchus kisutch) Redds in Three Small Oregon Streams

1988 ◽  
Vol 45 (4) ◽  
pp. 742-747 ◽  
Author(s):  
Neil H. Ringler ◽  
James D. Hall
Keyword(s):  
Vertical Distribution ◽  
Coho Salmon ◽  
Particle Diameter ◽  
Oncorhynchus Kisutch ◽  
Organic Content ◽  
Sediment Particle ◽  
Core Samples ◽  
Organic Debris ◽  
Coastal Streams ◽  
Sediment Layers

Vertical distribution of sediment (particle diameter <3.33 mm) and organic debris was studied in coho salmon (Oncorhynchus kisutch) redds in three Oregon coastal streams subjected to different degrees of logging. Gravel composition in frozen cores varied significantly among redds in both logged streams. Sediment content in redds appeared to decrease with depth in the logged streams, but differences in gravel composition among streams obscured differences among depths. Sediment layers of variable thickness were visible in several core samples. In one logged stream, redds contained an average of 25% less sediment than redds used 1 yr earlier. Organic content of the gravel represented <2.8% of the core samples by weight and was directly related to the quantity of sediment in the streambed. The pattern of vertical distribution of organic debris in the clearcut stream (most abundant near the surface) differed significantly from that in the other two streams. Patterns of distribution and variability in gravel composition were consistent with post-logging changes in gravel permeability and survival to emergence of coho salmon.

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.

scholarly journals Hyperbilirubinemia of Coho Salmon Oncorhynchus kisutch Infected with Erythrocytic Inclusion Body Syndrome (EIBS) Virus

1994 ◽  
Vol 60 (5) ◽  
pp. 519-521 ◽  
Author(s):  
Tadashi Sakai ◽  
Hisashi Murata ◽  
Kiyoshi Yamauchi ◽  
Kiyotaka Takahashi ◽  
Nobuaki Okamoto ◽  
...  
Keyword(s):  
Inclusion Body ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch
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