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A Preliminary Estimate Of The Value Of Snake River Fish Runs Item Info

Since 1938 anadromous fish have had to navigate past the dams on the Columbia and Snake Rivers. The U.S. Army Crops of Engineers has maintained fish ladders and counting facilities at these dams, and has provided an annual count of the numbers of fish by major species since 1938. The U.S. Army Corps of Engineers has contracted with the Washington Department of Wildlife to do fish counting. The species of fish counted and included in this study include chinook and sockeye salmon, and steelhead trout. Over the years the number of fish counted annually has varied greatly. This variation is related to a number of factors such as the cycle of spawning, river and ocean conditions, and a number of other factors which are not well understood. Among these factors is the ability of particular species to respond to changing environmental conditions. These environmental conditions include both freshwater and salt water factors . In the freshwater situation, spawning habitat, downstream and upstream fish passage, and the mainstream predation environment, and the fresh water harvest are all factors to be considered. In the salt water environment the off shore ocean fishery, El Nin'o, and predation are factors. Additionally, some mature fish return to spawn after one year (jacks), some after two years, some after 3 years, some after four years, and some after 5 years. This variability is reflected in the fish counts and appears as the peaks and valleys on the charts which follow.

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Title:
A Preliminary Estimate Of The Value Of Snake River Fish Runs
Creator:
Michalson, Edgar L.
Date Created (ISO Standard):
1995-06
Description:
Since 1938 anadromous fish have had to navigate past the dams on the Columbia and Snake Rivers. The U.S. Army Crops of Engineers has maintained fish ladders and counting facilities at these dams, and has provided an annual count of the numbers of fish by major species since 1938. The U.S. Army Corps of Engineers has contracted with the Washington Department of Wildlife to do fish counting. The species of fish counted and included in this study include chinook and sockeye salmon, and steelhead trout. Over the years the number of fish counted annually has varied greatly. This variation is related to a number of factors such as the cycle of spawning, river and ocean conditions, and a number of other factors which are not well understood. Among these factors is the ability of particular species to respond to changing environmental conditions. These environmental conditions include both freshwater and salt water factors . In the freshwater situation, spawning habitat, downstream and upstream fish passage, and the mainstream predation environment, and the fresh water harvest are all factors to be considered. In the salt water environment the off shore ocean fishery, El Nin'o, and predation are factors. Additionally, some mature fish return to spawn after one year (jacks), some after two years, some after 3 years, some after four years, and some after 5 years. This variability is reflected in the fish counts and appears as the peaks and valleys on the charts which follow.
Subjects:
Impact analysis cost benefit rivers
AgEcon Search Subjects:
Research Methods/ Statistical Methods Demand and Price Analysis Resource /Energy Economics and Policy
Series:
Agricultural Economic Research Series
Source Identifier:
aers95-05
Type:
text
Format:
application/pdf
Contributing Departments:
Department of Agricultural Economics and Rural Sociology

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Source
Preferred Citation:
"A Preliminary Estimate Of The Value Of Snake River Fish Runs", Agricultural Economics Research Series, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/aers/items/aers227.html
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In Copyright – Educational Use Permitted. Digital reproduction rights assigned to University of Idaho Library by donor/contributing institution/source (as applicable). For more information, please contact University of Idaho Library Special Collections and Archives Department at libspec@uidaho.edu.
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