Elevation of plasma cortisol during the spawning migration of landlocked kokanee salmon (Oncorhynchus nerka kennerlyi)

2000 ◽  
Vol 127 (2) ◽  
pp. 123-131 ◽  
Author(s):  
Laura L Carruth ◽  
Robert M Dores ◽  
Tammy A Maldonado ◽  
David O Norris ◽  
Tina Ruth ◽  
...  
Keyword(s):  
Plasma Cortisol ◽  
Oncorhynchus Nerka ◽  
Spawning Migration ◽  
Kokanee Salmon

Biochemical Studies on Sockeye Salmon During Spawning Migration: XI. The Free Histidine Content of the Tissues

1960 ◽  
Vol 17 (3) ◽  
pp. 347-351 ◽  
Author(s):  
J. D. Wood ◽  
D. W. Duncan ◽  
M. Jackson
Keyword(s):  
Amino Acid ◽  
Sockeye Salmon ◽  
Alimentary Tract ◽  
Oncorhynchus Nerka ◽  
The Other ◽  
Spawning Migration ◽  
Fraser River ◽  
Initial Value ◽  
Spawning Grounds ◽  
Biochemical Studies

During the first 250 miles (400 km) of spawning migration of Fraser River sockeye salmon (Oncorhynchus nerka) the free histidine content of the muscle, alimentary tract, and head+skin+bones+tail decreased to a small fraction of the initial value. A further decrease occurred in the levels of this amino acid in the alimentary tract during the subsequent 415-mile (657-km) migration to the spawning grounds, no change being observed with the other tissues. Comparatively small changes in free histidine were found with heart, spleen, liver, kidney and gonads during migration.

An Acoustic Estimate of the Escapement of Sockeye Salmon (Oncorhynchus nerka) into Lake Washington in 1971

1974 ◽  
Vol 31 (2) ◽  
pp. 222-225 ◽  
Author(s):  
Richard E. Thorne ◽  
James J. Dawson
Keyword(s):  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Spawning Migration ◽  
Spawning Ground ◽  
Large Fish ◽  
Before And After ◽  
Lake Washington

The feasibility of estimating the escapement of sockeye salmon (Oncorhynchus nerka) into Lake Washington by hydroacoustics was explored during 1971. Surveys were made of large fish targets within the lake just before and after the spawning migration of sockeye salmon up the Cedar River. A decrease was observed after the spawning migration comparable to the estimated escapement as determined by weir counts and spawning ground surveys.

Corticosteroid Concentrations in Sockeye Salmon (Oncorhynchus nerka) Exposed to Low Concentrations of Copper

1975 ◽  
Vol 32 (4) ◽  
pp. 533-539 ◽  
Author(s):  
Edward M. Donaldson ◽  
Helen M. Dye
Keyword(s):  
Heavy Metals ◽  
Stress Response ◽  
Plasma Cortisol ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Rapid Evaluation ◽  
Low Concentrations ◽  
Competitive Protein Binding ◽  
Cupric Sulphate ◽  
Sublethal Concentrations

Yearling sockeye salmon (Oncorhynchus nerka) were exposed for 1–24 h to 10−7, 10−6, or 10−5 molar cupric sulphate in freshwater aquaria. Plasma cortisol, cortisone, and "total" corticosteroid concentrations were measured by a competitive protein binding technique.Cortisol, cortisone and "total" corticosteroid levels were significantly higher than control concentrations after 1 h of exposure to 10−5 or 10−6 M copper. "Total" corticosteroid and cortisone concentrations were significantly higher than control concentrations after 2 and 4 h of exposure to 10−7 M copper, respectively. Fish exposed to 10−5 M copper died between 8 and 24 h.The data reflect a rapid corticosteroid stress response to lethal and sublethal concentrations of copper. The technique may be of use for rapid evaluation of effluents containing heavy metals, especially those containing a mixture of toxicants.

Xenobiotic metabolizing enzyme activity in sockeye salmon (Oncorhynchus nerka) during spawning migration

1992 ◽  
Vol 34 (1-4) ◽  
pp. 293-298 ◽  
Author(s):  
John M. Kennish ◽  
Reese A. Bolinger ◽  
Kent A. Chambers ◽  
Melinda L. Russell
Keyword(s):  
Enzyme Activity ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Spawning Migration ◽  
Metabolizing Enzyme

scholarly journals Physiology of individual late-run Fraser River sockeye salmon (Oncorhynchus nerka) sampled in the ocean correlates with fate during spawning migration

2006 ◽  
Vol 63 (7) ◽  
pp. 1469-1480 ◽  
Author(s):  
Steven J Cooke ◽  
Scott G Hinch ◽  
Glenn T Crossin ◽  
David A Patterson ◽  
Karl K English ◽  
...  
Keyword(s):  
Sockeye Salmon ◽  
Acute Stress ◽  
Oncorhynchus Nerka ◽  
Spawning Migration ◽  
Fraser River ◽  
Stress Indicators ◽  
Spawning Areas ◽  
Plasma Estradiol ◽  
Somatic Energy ◽  
Estradiol Levels

Beginning in 1995, segments of the late-run sockeye salmon (Oncorhynchus nerka) stocks from the Fraser River, British Columbia, have initiated upriver spawning migration up to 6 weeks earlier than historical records; and those fish have experienced high rates of en route mortality. We examined the correlations between physiological and energetic status prior to river entry with subsequent migratory performance of individual salmon using telemetry and noninvasive biopsies for Adams–Thompson–Shuswap (Adams) and Weaver–Harrison (W–H) stocks. Salmon that failed to reach the river were characterized by a tendency to have elevated levels of chronic and acute stress indicators. For one stock of fish (i.e., Adams) that entered the river, those that died before reaching spawning grounds were individuals with low gross somatic energy. Furthermore, females tended to have elevated plasma estradiol levels. When contrasting fish with different behaviours and fates, fish that did not hold in the estuary and subsequently died tended to have less energy than fish that held and reached spawning areas. Females from the former group also had higher 11-ketotestosterone and estradiol levels relative to those from the later group. These data suggest that differences in physiological and energetic status may be associated with high en route mortality in late-run sockeye salmon.

Impact of the Introduction of Kokanee (Oncorhynchus nerka) and Opossum Shrimp (Mysis relicta) on a Subalpine Lake

1978 ◽  
Vol 35 (12) ◽  
pp. 1572-1579 ◽  
Author(s):  
Mark D. Morgan ◽  
Stephen T. Threlkeld ◽  
Charles R. Goldman
Keyword(s):  
Population Dynamics ◽  
Lake Trout ◽  
Oncorhynchus Nerka ◽  
Food Sources ◽  
Mysis Relicta ◽  
Kokanee Salmon ◽  
Opossum Shrimp ◽  
Cladoceran Species ◽  
Subalpine Lake ◽  
The Impact

Introductions of opossum shrimp (Mysis relicta) and kokanee salmon (Oncorhynchus nerka) are common management tools for improvement of local sport fisheries. This paper summarizes published information from varied sources and presents supplemental data on the impact of these introductions on the Lake Tahoe zooplankton and fish communities. Concomitant with peak spawning runs of kokanee and the establishment and high densities of Mysis was the disappearance of the three pelagic cladoceran species in the lake. Population dynamics analysis of the cladoceran populations indicate that their elimination was due to increasing death rates (related to Mysis and kokanee predation) and decreasing birth rates (possibly related to cultural eutrophication). Changes have also been observed in the fish populations. Lake trout have altered their food habits to include large quantities of Mysis, but this has been done to the exclusion of other prey types. Thus, improvement in lake trout condition has been indicated only in years when Mysis is abundant. Recent evidence of a sustained decline in the mysid population suggests that unless lake trout shift back to more traditional food sources, their condition could deteriorate to below pre-mysid levels. Finally, mean weight and abundance of kokanee spawners have declined since the cladoceran disappearance, suggesting a negative impact on the whole population which fed heavily on cladocerans. Key words: opossum shrimp, kokanee salmon, population dynamics, cladoceran decline, introductions, subalpine lake

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