Age At Maturity Of The Pacific Coast Salmon Of The Genus Oncorhynchus
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Age At Maturity Of The Pacific Coast Salmon Of The Genus Oncorhynchus
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Author : Charles Henry Gilbert
language : en
Publisher:
Release Date : 1913
Age At Maturity Of The Pacific Coast Salmon Of The Genus Oncorhynchus written by Charles Henry Gilbert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1913 with Fishes categories.
Age At Maturity Of The Pacific Coast Salmon Of The Genus Oncorhynchus
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Author : Charles Henry Gilbert
language : en
Publisher:
Release Date : 1912
Age At Maturity Of The Pacific Coast Salmon Of The Genus Oncorhynchus written by Charles Henry Gilbert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1912 with Salmon categories.
Age At Maturity Of The Pacific Coast Salmon Of The Genus Oncorhynchus Microform
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Author : British Columbia. Provincial Fisheries Department
language : en
Publisher:
Release Date : 1912
Age At Maturity Of The Pacific Coast Salmon Of The Genus Oncorhynchus Microform written by British Columbia. Provincial Fisheries Department and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1912 with Pacific salmon categories.
Age At Maturity Of The Pacific Coast Salmon Of The Genus Oncorhynchus Classic Reprint
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Author : Charles Henry Gilbert
language : en
Publisher: Forgotten Books
Release Date : 2017-10-29
Age At Maturity Of The Pacific Coast Salmon Of The Genus Oncorhynchus Classic Reprint written by Charles Henry Gilbert and has been published by Forgotten Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-10-29 with categories.
Excerpt from Age at Maturity of the Pacific Coast Salmon of the Genus Oncorhynchus Three-year fish, or grilse, were not included in the above table. During the summer of 1911 they were not numerous. Only a few (perhaps three or four on the average) could usually be found in each fish brought in. It is the current belief among those who handle Fraser River sockeyes that all the grilse are male fish. As previously noted, all those examined by us were males, with one exception, a female with well-developed ova. Examina tion of the scales (see Pl. 1, Fig. 2) shows that the final summer's growth is more extensi1e in grilse than in those which mature at four and five years, and the narrowing of the marginal rings to form the third winter band has often begun. Much larger specimens than those included in the table were selected for examination in an attempt to find individuals older than five years. Several were found over 30 inches long. Weighing 12 lb. But all were five-year fish. Examination of a larger number may possibly bring to light's rare individual which has not matured until its sixth year. Even this is doubtful, and we assuredly do not anticipate finding older than six year individuals among the Fraser River sockeyes. 'lhe significance of the marking experiments of the Bureau of Fisheries in the Naha River, with the reported recovery of marked specimens up to nine years old, remains to be determined. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Age At Maturity Of The Pacific Coast Salmon Of The Genus Oncorhynchus Microform
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Author : Charles H (Charles Henry) Gilbert
language : en
Publisher: Legare Street Press
Release Date : 2021-09-09
Age At Maturity Of The Pacific Coast Salmon Of The Genus Oncorhynchus Microform written by Charles H (Charles Henry) Gilbert and has been published by Legare Street Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-09-09 with categories.
This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Physiological Ecology Of Pacific Salmon
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Author : Cornelis Groot
language : en
Publisher: UBC Press
Release Date : 2010-10-01
Physiological Ecology Of Pacific Salmon written by Cornelis Groot and has been published by UBC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-10-01 with Nature categories.
Every year, countless juvenile Pacific salmon leave streams and rivers on their migration to feeding grounds in the North Pacific Ocean and the Bering Sea. After periods ranging from a few months to several years, adult salmon enter rivers along the coasts of Asia and North America to spawn and complete their life cycle. Within this general outline, various life history patterns, both among and within species, involve diverse ways of exploiting freshwater, estuarine, and marine habitats. There are seven species of Pacific salmon. Five (coho, chinook chum, pink, and sockeye) occur in both North America and Asia. Their complex life histories and spectacular migrations have long fascinated biologists and amateurs alike. Physiological Ecology of Pacific Salmon provides comprehensive reviews by leading researchers of the physiological adaptations that allow Pacific Salmon to sustain themselves in the diverse environments in which they live. It begins with an analysis of energy expenditure and continues with reviews of locomotion, growth, feeding, and nutrition. Subsequent chapters deal with osmotic adjustments enabling the passage between fresh and salt water, nitrogen excretion and regulation of acid-base balance, circulation and gas transfer, and finally, responses to stress. This thorough and authoritative volume will be a valuable reference for students and researchers of biology and fisheries science as they seek to understand the environmental requirements for the perpetuation of these unique and valuable species.
Draft Amendment 14 Pacific Coast Salmon Plan
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Author :
language : en
Publisher:
Release Date : 1999
Draft Amendment 14 Pacific Coast Salmon Plan written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
Papers On Pacific Salmon
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Author :
language : en
Publisher:
Release Date : 1898
Papers On Pacific Salmon written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1898 with Fishes categories.
Bureau Of Fisheries Document
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Author :
language : en
Publisher:
Release Date : 1913
Bureau Of Fisheries Document written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1913 with Fisheries categories.
Pacific Salmon Life Histories
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Author : Cornelis Groot
language : en
Publisher: UBC Press
Release Date : 1991
Pacific Salmon Life Histories written by Cornelis Groot and has been published by UBC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Nature categories.
Pacific 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.