Migrations, Abundance, and Origins of Salmonids in Offshore Waters of the North Pacific, 1997
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Published: 1997
Total Pages: 212
ISBN-13:
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Author:
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Published: 1997
Total Pages: 212
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Published: 1998
Total Pages: 130
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Published: 1995
Total Pages: 192
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Published: 2000
Total Pages: 108
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DOWNLOAD EBOOKAuthor: Cornelis Groot
Publisher: UBC Press
Published: 1991
Total Pages: 602
ISBN-13: 9780774803595
DOWNLOAD EBOOKPacific salmon are an important biological and economic resource of countries of the North Pacific rim. They are also a unique group of fish possessing unusually complex life histories. There are seven species of Pacific salmon, five occurring on both the North American and Asian continents (sockeye, pink, chum, chinook, and coho) and two (masu and amago) only in Asia. The life cycle of the Pacific salmon begins in the autumn when the adult female deposits eggs that are fertilized in gravel beds in rivers or lakes. The young emerge from the gravel the following spring and will either migrate immediately to salt water or spend one or more years in a river or lake before migrating. Migrations in the ocean are extensive during the feeding and growing phase, covering thousands of kilometres. After one or more years the maturing adults find their way back to their home river, returning to their ancestral breeding grounds to spawn. They die after spawning and the eggs in the gravel signify a new cycle. Upon this theme Pacific salmon have developed many variations, both between as well as within species. Pacific Salmon Life Histories provides detailed descriptions of the different life phases through which each of the seven species passes. Each chapter is written by a scientist who has spent years studying and observing a particular species of salmon. Some of the topics covered are geographic distribution, transplants, freshwater life, ocean life, development, growth, feeding, diet, migration, and spawning behaviour. The text is richly supplemented by numerous maps, illustrations, colour plates, and tables and there is a detailed general index, as well as a useful geographical index.
Author: Katherine W. Myers
Publisher:
Published: 1998
Total Pages: 68
ISBN-13:
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Published: 1984
Total Pages: 962
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DOWNLOAD EBOOKAuthor: Loren Stern
Publisher:
Published: 1976
Total Pages: 104
ISBN-13:
DOWNLOAD EBOOKAuthor: National Research Council
Publisher: National Academies Press
Published: 2004-09-07
Total Pages: 304
ISBN-13: 0309166586
DOWNLOAD EBOOKBecause of the pervasive and substantial decline of Atlantic salmon populations in Maine over the past 150 years, and because they are close to extinction, a comprehensive statewide action should be taken now to ensure their survival. The populations of Atlantic salmon have declined drastically, from an estimated half million adult salmon returning to U.S. rivers each year in the early 1800s to perhaps as few as 1,000 in 2001. The report recommends implementing a formalized decision-making approach to establish priorities, evaluate options and coordinate plans for conserving and restoring the salmon.