Age At Maturity Of The Pacific Coast Salmon Of The Genus Oncorhynchus Classic Reprint
DOWNLOAD
Download Age At Maturity Of The Pacific Coast Salmon Of The Genus Oncorhynchus Classic Reprint PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Age At Maturity Of The Pacific Coast Salmon Of The Genus Oncorhynchus Classic Reprint book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Age At Maturity Of The Pacific Coast Salmon Of The Genus Oncorhynchus Classic Reprint
DOWNLOAD
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.
Bulletin Of The United States Bureau Of Fisheries Vol 37
DOWNLOAD
Author : Hugh M. Smith
language : en
Publisher:
Release Date : 2015-07-21
Bulletin Of The United States Bureau Of Fisheries Vol 37 written by Hugh M. Smith and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-07-21 with Science categories.
Excerpt from Bulletin of the United States Bureau of Fisheries, Vol. 37: 1919-1920 The present study of the chinook salmon (Oncorhynchus Ischawylscha), of which this paper forms the first contribution, was started in the summer of 1914 at the instance of the U.S. Bureau of Fisheries. The importance and necessity of such a study had been made apparent, especially by the work of Gilbert on the sockeye salmon, and it seemed advisable to extend in detail the outline of the life history of the chinook as given by Gilbert (1913). The method employed - that of analysis on the basis of scale studies - is now too well known and too widely used to need description. The paper just cited and subsequent studies of the sockeye by the same author contain a complete description of the methods emoloyed and form admirable examples of studies prosecuted on this basis. Our knowledge of the life histories of all the Pacific coast Salmonidae was distinctly unsatisfactory previous to the discovery of the value of scale studies. The descriptions given by Jordan and Evermann (1896-1900), Jordan (1905), Rutter (1903), Scofield (1898), and Chamberlain (1907), contain the most accurate information regarding the chinook which was available prior to Gilbert's first study. The general features of the early life in fresh water and of the seaward migration were well known, and Chamberlain had shown quite conclusively that the sockeye and chinook salmon mature commonly at about the fourth year, although this is subject to variation. The work of McMurrich (1912) on the chinook salmon, based on the scales, has been shown by Gilbert (1913) to be unreliable because of the small number of specimens examined and an incorrect interpretation of the central (nuclear) area of the scales. It remained, therefore, for Gilbert (1913) to give us the first accurate description of the general features of the life history of the chinook salmon in his paper, "The Age at Maturity of the Pacific Coast Salmon of the genus Oncorhynchus." In this he shows, among other things, that: (a) The chinook, or king, salmon spawn normally either in the fourth, fifth, sixth, or seventh year, the females more frequently in the fourth year; (b) the "grilse" are exclusively males and are of two sizes, representing two and three year fish; (c) the young may migrate as fry soon after hatching, or may remain in the stream until their second spring, migrating as yearlings; and (d) among the fish of any given age, the larger specimens will be those which migrated seaward as fry, although these do not attain the average stature of those fish, one year older, which migrated as yearlings. 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."
Salmon Without Rivers
DOWNLOAD
Author : Jim Lichatowich
language : en
Publisher:
Release Date : 1999-08
Salmon Without Rivers written by Jim Lichatowich and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-08 with History categories.
"Fundamentally, the salmon's decline has been the consequence of a vision based on flawed assumptions and unchallenged myths.... We assumed we could control the biological productivity of salmon and 'improve' upon natural processes that we didn't even try to understand. We assumed we could have salmon without rivers." --from the introduction From a mountain top where an eagle carries a salmon carcass to feed its young to the distant oceanic waters of the California current and the Alaskan Gyre, salmon have penetrated the Northwest to an extent unmatched by any other animal. Since the turn of the twentieth century, the natural productivity of salmon in Oregon, Washington, California, and Idaho has declined by eighty percent. The decline of Pacific salmon to the brink of extinction is a clear sign of serious problems in the region. In Salmon Without Rivers, fisheries biologist Jim Lichatowich offers an eye-opening look at the roots and evolution of the salmon crisis in the Pacific Northwest. He describes the multitude of factors over the past century and a half that have led to the salmon's decline, and examines in depth the abject failure of restoration efforts that have focused almost exclusively on hatcheries to return salmon stocks to healthy levels without addressing the underlying causes of the decline. The book: describes the evolutionary history of the salmon along with the geologic history of the Pacific Northwest over the past 40 million years considers the indigenous cultures of the region, and the emergence of salmon-based economies that survived for thousands of years examines the rapid transformation of the region following the arrival of Europeans presents the history of efforts to protect and restore the salmon offers a critical assessment of why restoration efforts have failed Throughout, Lichatowich argues that the dominant worldview of our society -- a worldview that denies connections between humans and the natural world -- has created the conflict and controversy that characterize the recent history of salmon; unless that worldview is challenged and changed, there is little hope for recovery. Salmon Without Rivers exposes the myths that have guided recent human-salmon interactions. It clearly explains the difficult choices facing the citizens of the region, and provides unique insight into one of the most tragic chapters in our nation's environmental history.
Mechanisms Of Migration In Fishes
DOWNLOAD
Author : James D. McCleave
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-13
Mechanisms Of Migration In Fishes written by James D. McCleave and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-13 with Science categories.
The last major synthesis of our knowledge of fish migration and the underlying transport and guidance phenomena, both physical and biological, was "Fish Migration" published 16 years ago by F.R. Harden Jones (1968). That synthesis was based largely upon what could be gleaned by classical fishery-biology techni.ques, such as tagging and recapture studies, commercial fishing statistics, and netting and trapping studies. Despite the fact that Harden Jones also provided, with a good deal of thought and speculation, a theoretical basis for studying the various aspects of fish migration and migratory orientation, progress in this field has been, with a few excepti.ons, piecemeal and more disjointed than might have been expected. Thus we welcomed the approach from the NATO Marine Sciences Programme Panel and the encouragement from F.R. Harden Jones to develop a proprosal for, and ultimately to organize, a NATO Advanced Research Institute (ARI) on mechanisms of fish migration. Substantial progress had been made with descriptive, analytical and predictive approaches to fish migration since the appearance of "Fish ~ligration." Both because of the progress and the often conflicting results of research, we felt that the time was again right and the effort justified to synthesize and to critically assess our knowledge. Our ultimate aim was to identify the gains and shortcomings and to develop testable hypotheses for the next decade or two.
Migratory Fishes Of South America
DOWNLOAD
Author : Joachim Carolsfeld
language : en
Publisher: IDRC
Release Date : 2003
Migratory Fishes Of South America written by Joachim Carolsfeld and has been published by IDRC this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Nature categories.
The Diversity Of Fishes
DOWNLOAD
Author : Gene Helfman
language : en
Publisher: John Wiley & Sons
Release Date : 2009-04-03
The Diversity Of Fishes written by Gene Helfman and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-04-03 with Technology & Engineering categories.
The second edition of The Diversity of Fishes represents a major revision of the world’s most widely adopted ichthyology textbook. Expanded and updated, the second edition is illustrated throughout with striking color photographs depicting the spectacular evolutionary adaptations of the most ecologically and taxonomically diverse vertebrate group. The text incorporates the latest advances in the biology of fishes, covering taxonomy, anatomy, physiology, biogeography, ecology, and behavior. A new chapter on genetics and molecular ecology of fishes has been added, and conservation is emphasized throughout. Hundreds of new and redrawn illustrations augment readable text, and every chapter has been revised to reflect the discoveries and greater understanding achieved during the past decade. Written by a team of internationally-recognized authorities, the first edition of The Diversity of Fishes was received with enthusiasm and praise, and incorporated into ichthyology and fish biology classes around the globe, at both undergraduate and postgraduate levels. The second edition is a substantial update of an already classic reference and text. Companion resources site This book is accompanied by a resources site: www.wiley.com/go/helfman The site is being constantly updated by the author team and provides: · Related videos selected by the authors · Updates to the book since publication · Instructor resources · A chance to send in feedback
Ocean Ecology Of North Pacific Salmonids
DOWNLOAD
Author : William G. Pearcy
language : en
Publisher: University of Washington Press
Release Date : 1992
Ocean Ecology Of North Pacific Salmonids written by William G. Pearcy and has been published by University of Washington Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Nature categories.
A compendium of Northeast Pacific salmon ecology, encompassing all five salmon and two trout species of Oncorhynchus--with Oregon coho salmon, the author's specialty for the past decade, acting as centerpiece. Annotation copyrighted by Book News, Inc., Portland, OR
Fishers Knowledge In Fisheries Science And Management
DOWNLOAD
Author : Nigel Haggan
language : en
Publisher: United Nations Educational, Scientific & Cultural Organization
Release Date : 2007
Fishers Knowledge In Fisheries Science And Management written by Nigel Haggan and has been published by United Nations Educational, Scientific & Cultural Organization this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Social Science categories.
Drawing on a number of case studies from around the world, this publication considers how the local knowledge and practices of indigenous fishing communities are being used in collaboration with scientists, government managers and non-governmental organisations to establish effective frameworks for sustainable fisheries science and management. It seeks to contribute towards achieving the goal of establishing international responsibility for the ethical collection, preservation, dissemination and application of fishers' knowledge.
Handbook Of Fish Biology And Fisheries
DOWNLOAD
Author : Paul J. B. Hart
language : en
Publisher: John Wiley & Sons
Release Date : 2008-04-15
Handbook Of Fish Biology And Fisheries written by Paul J. B. Hart and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-04-15 with Technology & Engineering categories.
Recent decades have witnessed strong declines in fish stocks aroundthe globe, amid growing concerns about the impact of fisheries onmarine and freshwater biodiversity. Fisheries biologists andmanagers are therefore increasingly asking about aspects ofecology, behaviour, evolution and biodiversity that weretraditionally studied by people working in very separate fields.This has highlighted the need to work more closely together, inorder to help ensure future success both in management andconservation. The Handbook of Fish Biology and Fisheries has beenwritten by an international team of scientists and practitioners,to provide an overview of the biology of freshwater and marine fishspecies together with the science that supports fisheriesmanagement and conservation. This volume, subtitled Fish Biology, reviews a broadvariety of topics from evolutionary relationships and globalbiogeography to physiology, recruitment, life histories, genetics,foraging behaviour, reproductive behaviour and community ecology.The second volume, subtitled Fisheries, uses much of thisinformation in a wide-ranging review of fisheries biology,including methods of capture, marketing, economics, stockassessment, forecasting, ecosystem impacts and conservation. Together, these books present the state of the art in ourunderstanding of fish biology and fisheries and will serve asvaluable references for undergraduates and graduates looking for acomprehensive source on a wide variety of topics in fisheriesscience. They will also be useful to researchers who needup-to-date reviews of topics that impinge on their fields, anddecision makers who need to appreciate the scientific backgroundfor management and conservation of aquatic ecosystems. To order volume I, go to the box in the top right hand corner.Alternatively to order volume II, go to:http://www.blackwellpublishing.com/book.asp?ref=063206482X or toorder the 2 volume set, go to:http://www.blackwellpublishing.com/book.asp?ref=0632064838. Provides a unique overview of the study of fish biology andecology, and the assessment and management of fish populations andecosystems. The first volume concentrates on aspects of fish biology andecology, both at the individual and population levels, whilst thesecond volume addresses the assessment and management of fishpopulations and ecosystems. Written by an international team of expert scientists andpractitioners. An invaluable reference tool for both students, researchers andpractitioners working in the fields of fish biology andfisheries.
Tilapias Biology And Exploitation
DOWNLOAD
Author : M.C.M Beveridge
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Tilapias Biology And Exploitation written by M.C.M Beveridge and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Referred to in the Bible, pictured on the wall-friezes of ancient Egyptian tombs, and a subject of fascination for generations of scientists, the tilapias (Cichlidae: Tilapiini) have featured in the diet and culture of humankind for thousands of years. The present century has seen their spread from Africa throughout the tropics and sub-tropics, largely for food and fisheries purposes. This book attempts to pull together our knowledge of this important group - their biology and fisheries and aquaculture - in a single volume, something that has not been done comprehensively for nearly two decades. A succession of chapters by acknowledged authorities covers evolution, phylogenetic relationships and biogeography, reproductive biology, mating systems and parental care, diet, feeding and digestive physiology, environmental physiology and energetics, the role of tilapias in ecosystems, population dynamics and management, genetics, seed production, nutrition, farming, economics and marketing. The book is aimed at biologists, fisheries scientists, aquaculturists, and all interested in aquatic ecology.