Feeding Bionomics of Juvenile Chinook Salmon Relative to Thermal Discharges in the Central Columbia River
Title | Feeding Bionomics of Juvenile Chinook Salmon Relative to Thermal Discharges in the Central Columbia River PDF eBook |
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Release | 1994 |
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Food and Feeding of Juvenile Chinook Salmon in the Central Columbia River in Relation to Thermal Discharges and Other Environmental Features
Title | Food and Feeding of Juvenile Chinook Salmon in the Central Columbia River in Relation to Thermal Discharges and Other Environmental Features PDF eBook |
Author | Clarence Dale Becker |
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Pages | 84 |
Release | 1971 |
Genre | Chinook salmon |
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Food and Feeding of Juvenile Chinook Salmon in the Central Columbia River in Relation to Thermal Discharges and Other Environmental Features
Title | Food and Feeding of Juvenile Chinook Salmon in the Central Columbia River in Relation to Thermal Discharges and Other Environmental Features PDF eBook |
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Release | 1970 |
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Energy Research Abstracts
Title | Energy Research Abstracts PDF eBook |
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Pages | 782 |
Release | 1995 |
Genre | Power resources |
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Sport Fishery Abstracts
Title | Sport Fishery Abstracts PDF eBook |
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Pages | 338 |
Release | 1975 |
Genre | Fish culture |
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Food and Growth Parameters of Juvenile Chinook in the Central Columbia River
Title | Food and Growth Parameters of Juvenile Chinook in the Central Columbia River PDF eBook |
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Pages | 44 |
Release | 1994 |
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Juvenile chinook, salmon (Oncorhynchus tshawytscha) in the Hanford area of the free-flowing central Columbia River, Washington consume almost entirely adult and larval stages of aquatic insects. The diet is dominated by midges (Diptera: Chironomidae). By numbers, adult midges provided 64 and 58% of the diet and larval midges 17 and 18% of the diet, in 1968 and 1969, respectively. The families Hydropsychidae (Trichoptera), Notonectidae (Hemiptera) and Hypogastruridae (Collembola) are of minor numerical importance with a combined utilization of 7% in 1968 and 15% in 1969. Distinctive features of food and feeding activity of juvenile chinook at Hanford are fourfold: (1) the fish utilize relatively few insect groups, predominantly Chironomidae; (2) they depend largely upon autochthonous river organisms; (3) they visually select living prey drifting, floating or swimming in the water; and (4) they are apparently habitat opportunists to a large extent. Analyses were made of variations in diet and numbers of insects consumed between six sampling stations distributed along a 38 km section of the river. Data are provided on feeding intensity, fish lengths, length-weight relationships, and coefficients of condition. Seasonal changes in river temperature and discharge, as well as variations in regulated flow levels are environmental features influencing feeding, growth, and emigration of fish in the Hanford environs.
Temperature, Timing and Seaward Migration of Juvenile Chinook Salmon from the Central Columbia River
Title | Temperature, Timing and Seaward Migration of Juvenile Chinook Salmon from the Central Columbia River PDF eBook |
Author | Clarence Dale Becker |
Publisher | |
Pages | 32 |
Release | 1970 |
Genre | Chinook salmon |
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