The relationship between hydroregime and coho salmon ( Oncorhynchus kisutch ) redd construction in the Smith River, Oregon

2021 ◽  
Author(s):  
Mackenzie B. Butler ◽  
Rebecca L. Flitcroft ◽  
Guillermo Giannico
Keyword(s):  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
The Relationship

An Investigation of the Relationship Between Oregon Coho Salmon (Oncorhynchus kisutch) Hatchery Releases and Adult Production Utilizing Law of the Minimum Regression

1983 ◽  
Vol 40 (4) ◽  
pp. 516-523 ◽  
Author(s):  
Jerry Clark ◽  
Bruce McCarl
Keyword(s):  
Density Dependence ◽  
Regression Models ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Regression Technique ◽  
Limiting Factors ◽  
Regression Equations ◽  
Simple Simulation ◽  
The Relationship

This study examines aggregate relationships between coho salmon (Oncorhynchus kisutch) adult production and hatchery releases within the Oregon Index Area (OIA). Previous analyses have indicated the presence of density dependence, and concluded with a request for a reduction in hatchery smolt releases. The hypothesis that density dependence is exhibited in the OIA is tested via a broad correlation approach. Several regression models are used including one unique one in fisheries research based on limiting factors.Analysis was done on the fitted regression equations including a simple simulation of release policies. Neither significant density dependence nor a statistically supportable technical maximum for smolt releases was found. The limiting factors regression technique generally gives the best results of all the models employed, and thus appears potentially useful in this type of fisheries work.

Food abundance and territory size in juvenile coho salmon (Oncorhynchus kisutch)

1981 ◽  
Vol 59 (9) ◽  
pp. 1801-1809 ◽  
Author(s):  
Lawrence M. Dill ◽  
Ronald C. Ydenberg ◽  
Alex H. G. Fraser
Keyword(s):  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Food Abundance ◽  
Territory Size ◽  
Feeding Territory ◽  
Effect Of Food ◽  
Benthic Food ◽  
The Relationship ◽  
Potential Food ◽  
Behavioural Mechanism

Feeding territory size and potential food abundance were measured simultaneously in a field population of juvenile (40–50 mm) coho salmon. Territory size was inversely related to the density of benthic food on the territory, as predicted from an energy-based model of territoriality. The relationship between the abundance of drift food and territory size was in the predicted direction, but was not significant. Territories were also smaller where intruder pressure was higher, but intrusion rate and food abundance were not directly correlated. Therefore, the effect of food abundance on territory size was not caused indirectly by attraction of nonterritorial fish to areas where food was abundant. In the laboratory, the distance from which a resident coho attacked an approaching model intruder increased asymptotically with hunger. The fish therefore appear to possess an appropriate behavioural mechanism (tactic) to adjust territory size to local food abundance.

Effect of Temperature, Season, and Fish Size on Acute Lethality of Suspended Sediments to Coho Salmon (Oncorhynchus kisutch)

1991 ◽  
Vol 48 (3) ◽  
pp. 493-497 ◽  
Author(s):  
James A. Servizi ◽  
Dennis W. Martens
Keyword(s):  
Oxygen Transfer ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Suspended Sediments ◽  
Effect Of Temperature ◽  
Fraser River ◽  
Metabolic Rates ◽  
Temperature Dependent ◽  
Cough Reflex ◽  
The Relationship

Tolerance of underyearling coho salmon (Oncorhynchus kisutch) to Fraser River suspended sediments (SS) at 7 °C was independent of season of the year. However, coho of 0.52 g (4.0 cm) possessed only 35% of the tolerance of larger specimens. Tolerance to SS was temperature dependent, with 96-h LC50 at 1 and 18 °C being 47 and 33%, respectively, of the value at 7 °C. Tolerance was further reduced among underyearling coho which were later found to have a viral kidney infection. Cough reflex, oxygen transfer, oxygen saturation levels, metabolic rates, and capacity to do work all probably affect the relationship between SS tolerance and temperature.

Cost of Sustained and Burst Swimming to Juvenile Coho Salmon (Oncorhynchus kisutch)

1984 ◽  
Vol 41 (11) ◽  
pp. 1546-1551 ◽  
Author(s):  
K. J. Puckett ◽  
L. M. Dill
Keyword(s):  
Oxygen Consumption ◽  
Metabolic Rate ◽  
Oxygen Consumption Rate ◽  
Sockeye Salmon ◽  
Consumption Rate ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Metabolic Rates ◽  
Burst Swimming ◽  
The Relationship

The relationship between oxygen consumption rate (milligrams per kilogram per hour) and sustained swimming speed (calculated from tailbeat frequency) was determined for 1.2-g juvenile coho salmon (Oncorhynchus kisutch) at 15 °C. The data are best described by the following equation: log oxygen consumption rate = 2.2 + 0.13 (body lengths-s−1). This relationship is very similar to that extrapolated for sockeye salmon (O. nerka) of the same size, thus potentially enabling researchers to utilize the extensive sockeye data base to predict metabolic rates of coho. The oxygen consumption rate during burst swimming (9 body lengths∙s−1) was also determined. The burst swimming metabolic rate (38 000 mgO2∙kg−1∙h−1) is nearly 40 times greater than the maximum sustained swimming metabolic rate.

The influence of fall-spawning coho salmon (Oncorhynchus kisutch) on growth and production of juvenile coho salmon rearing in beaver ponds on the Copper River Delta, Alaska

2006 ◽  
Vol 63 (4) ◽  
pp. 917-930 ◽  
Author(s):  
Dirk W Lang ◽  
Gordon H Reeves ◽  
James D Hall ◽  
Mark S Wipfli
Keyword(s):  
Growth Rates ◽  
Feedback Loop ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
River Delta ◽  
Short Term ◽  
Beaver Ponds ◽  
Copper River Delta ◽  
The Relationship ◽  
Salmon Carcasses

This study examined the influence of fall-spawning coho salmon (Oncorhynchus kisutch) on the density, growth rate, body condition, and survival to outmigration of juvenile coho salmon on the Copper River Delta, Alaska, USA. During the fall of 1999 and 2000, fish rearing in beaver ponds that received spawning salmon were compared with fish from ponds that did not receive spawners and also with fish from ponds that were artificially enriched with salmon carcasses and eggs. The response to spawning salmon was variable. In some ponds, fall-spawning salmon increased growth rates and improved the condition of juvenile coho salmon. The enrichment with salmon carcasses and eggs significantly increased growth rates of fish in nonspawning ponds. However, there was little evidence that the short-term growth benefits observed in the fall led to greater overwinter growth or survival to outmigration when compared with fish from the nonspawning ponds. One potential reason for this result may be that nutrients from spawning salmon are widely distributed across the delta because of hydrologic connectivity and hyporheic flows. The relationship among spawning salmon, overwinter growth, and smolt production on the Copper River Delta does not appear to be limited entirely to a simple positive feedback loop.

An examination of the PCB: lipid relationship among individual fish

1997 ◽  
Vol 54 (5) ◽  
pp. 1031-1038
Author(s):  
C A Stow ◽  
L J Jackson ◽  
J F Amrhein
Keyword(s):  
Salmo Trutta ◽  
Lake Michigan ◽  
Oncorhynchus Tshawytscha ◽  
Lake Trout ◽  
Coho Salmon ◽  
Salvelinus Namaycush ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Strong Linear Correlation ◽  
Brown Trout Salmo Trutta ◽  
The Relationship

We examined data from 1984 to 1994 for five species of Lake Michigan salmonids to explore the relationship between total PCB concentration and percent lipid. When we compared mean species lipid and PCB values, we found a strong linear correlation. When we compared values among individuals, we found modest positive PCB:lipid associations in brown trout (Salmo trutta), chinook salmon (Oncorhynchus tshawytscha), coho salmon (Oncorhynchus kisutch), and rainbow trout (Oncorhynchus mykiss) collected during spawning, but positive associations were not apparent among nonspawning individuals. Lake trout (Salvelinus namaycush) exhibited no discernible PCB:lipid relationship. Our results are not incompatible with previous observations that contaminants are differentially partitioned into lipids within a fish, but these results do suggest that lipids are not a major factor influencing contaminant uptake.

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
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