The Feeding Ecology Of Chum Salmon Fry Oncoorhynchus Keta In Northern Prince William Sound Alaska PDF Download

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Feeding Ecology and Energy Density of Juvenile Chum Salmon, Oncorhynchus Keta, from Kuskokwim Bay, Western Alaska

Feeding Ecology and Energy Density of Juvenile Chum Salmon, Oncorhynchus Keta, from Kuskokwim Bay, Western Alaska
Author: Sean Eugene Burril
Publisher:
Total Pages: 152
Release: 2007
Genre: Chum salmon
ISBN:

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"Juvenile chum salmon from Kuskokwim Bay were sampled for patterns in diet and energy density in 2003 and 2004. Comparisons were made interannually, seasonally, between juvenile size classes, and between sailinity ranges. Sampling was conducted using a modified Kvichak Trawl. Bomb calorimetry was used to obtain energy density values. Feeding success and feeding intensity increased with fish size and season, and was highest in waters with moderate salinity. Feeding success and intensity were lowest for smaller juvenile chum salmon collected early in the season in water with low salinity. Prey composition was similar in both years, but varied with fish size, salinity ranges, and sampling weeks. Calanoid copepods and insects combined made up >50% of all prey items consumed and >80% of the overall prey biomass for all size classes, salinity ranges, and weeks. Feeding by juvenile chum salmon in Kuskokwim Bay appeared to be opportunistic. In 2003, no significant differences in energy density were found. In 2004, energy density decreased significantly from mid-May to mid-June and with increasing fish size. Decreasing energy density with season and size suggests that juvenile chum salmon were allocating the majority of their energy towards growth and smoltification, rather than lipid storage. Results from this study indicate that Kuskokwim bay may provide a suboptimal estuarine rearing habitat for juvenile chum salmon. If seasonally increasing energy demands are not balanced by an increasing food supply, the severe implications potentially include declines in growth rates and possibly overall survival probability of chum salmon juveniles in Kuskokwim Bay"--Leaf iii.


Estuarine Comparisons

Estuarine Comparisons
Author: Victor S Kennedy
Publisher: Elsevier
Total Pages: 728
Release: 2013-09-25
Genre: Science
ISBN: 1483257851

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Estuarine Comparisons compares the knowledge gained about many of the world's estuaries. The book compares the Pacific, Gulf, and Atlantic coast estuaries, and the physical, chemical, and biological parameters in estuaries throughout the world. The text also compares the features of North Sea, east and West Atlantic, Gulf, and Pacific estuaries, as well as of pioneering work in the Chang Jiang estuary of China, one of the largest in the world. Comparisons of anadromous fisheries, estuarine microbiology, and many other interactive features over a wide variety of latitudinal and longitudinal variation are also encompassed. People interested in estuaries, including ecologists, will find the book invaluable.


The Behavior and Ecology of Pacific Salmon and Trout

The Behavior and Ecology of Pacific Salmon and Trout
Author: Thomas P. Quinn
Publisher: University of Washington Press
Total Pages: 398
Release: 2005
Genre: Science
ISBN: 9780295984575

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Few subjects have generated as much emotional dialogue around conflicting scientific and policy agendas as the protection and management of Pacific salmon resources. In this major new work, esteemed fisheries expert Thomas Quinn distills from the vast scientific literature the essential information on the behavior and ecology of Pacific salmon, including steelhead and cutthroat trout. Unlike other books that examine only selected life stages, habitats, or species, this book--richly illustrated with beautiful photographs and original drawings--thoroughly covers the complete life cycle, emphasizing common themes and differences among the various species of salmon. Representing the range of species and geographic regions, Quinn includes examples from classic studies by pioneers of salmon biology and from the most current research to illustrate the important features of salmon life history and behavior and the complex physical, biological, and human factors that affect them. The Behavior and Ecology of Pacific Salmon and Trout introduces salmon and trout as a group, with a brief description of each species, and compares them to other fishes. The book then follows salmon on their amazing homeward migration from the open ocean, through the complex coastal waters, and upstream to the precise location where they were spawned years earlier. It explains the patterns of mate choice, the competition for nest sites, and the fate of the salmon after their death. It describes the lives of offspring during the months they spend incubating in gravel, growing in fresh water, and migrating out to sea to mature. Quinn emphasizes the importance of salmon to humans and to natural ecosystems and the need to integrate sound biology into conservation efforts. This thorough, up-to-date survey should be on the shelf of anyone with a professional or personal interest in Pacific salmon and trout. Written in a technically accurate but engaging style, it will appeal to a wide range of readers, including students, anglers, biologists, conservationists, legislators, and armchair naturalists.