Download or read book How Has the Atlantic Salmon Population and Population Structure in the River Frome Changed Over the Past 40 Years with Reference to Related Populations written by Louis Chancellor and published by . This book was released on 2019 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecology of Atlantic Salmon and Brown Trout written by Bror Jonsson and published by Springer Science & Business Media. This book was released on 2011-05-03 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: Destruction of habitat is the major cause for loss of biodiversity including variation in life history and habitat ecology. Each species and population adapts to its environment, adaptations visible in morphology, ecology, behaviour, physiology and genetics. Here, the authors present the population ecology of Atlantic salmon and brown trout and how it is influenced by the environment in terms of growth, migration, spawning and recruitment. Salmonids appeared as freshwater fish some 50 million years ago. Atlantic salmon and brown trout evolved in the Atlantic basin, Atlantic salmon in North America and Europe, brown trout in Europe, Northern Africa and Western Asia. The species live in small streams as well as large rivers, lakes, estuaries, coastal seas and oceans, with brown trout better adapted to small streams and less well adapted to feeding in the ocean than Atlantic salmon. Smolt and adult sizes and longevity are constrained by habitat conditions of populations spawning in small streams. Feeding, wintering and spawning opportunities influence migratory versus resident lifestyles, while the growth rate influences egg size and number, age at maturity, reproductive success and longevity. Further, early experiences influence later performance. For instance, juvenile behaviour influences adult homing, competition for spawning habitat, partner finding and predator avoidance. The abundance of wild Atlantic salmon populations has declined in recent years; climate change and escaped farmed salmon are major threats. The climate influences through changes in temperature and flow, while escaped farmed salmon do so through ecological competition, interbreeding and the spreading of contagious diseases. The authors pinpoint essential problems and offer suggestions as to how they can be reduced. In this context, population enhancement, habitat restoration and management are also discussed. The text closes with a presentation of what the authors view as major scientific challenges in ecological research on these species.
Download or read book The Atlantic Salmon written by Eric Verspoor and published by John Wiley & Sons. This book was released on 2008-04-15 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atlantic Salmon is a cultural icon throughout its North Atlantic range; it is the focus of probably the World’s highest profile recreational fishery and is the basis for one of the World’s largest aquaculture industries. Despite this, many wild stocks of salmon are in decline and underpinning this is a dearth of information on the nature and extent of population structuring and adaptive population differentiation, and its implications for species conservation. This important new book will go a long way to rectify this situation by providing a thorough review of the genetics of Atlantic salmon. Sponsored by the European Union and the Atlantic Salmon Trust, this book comprises the work of an international team of scientists, carefully integrated and edited to provide a landmark book of vital interest to all those working with Atlantic salmon.
Download or read book Genetic Status of Atlantic Salmon in Maine written by National Research Council and published by National Academies Press. This book was released on 2002-03-22 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atlantic salmon in Maine, once abundant but now seriously depleted, were listed as endangered under the federal Endangered Species Act (ESA) in November 2000. The listing covers the wild fish in eight Maine rivers as a single "distinct population segment." The controversy in Maine that accompanied the listing led Congress to request the National Research Council's (NRC's) advice on the science relevant to understanding and reversing the declines in Maine's salmon populations. The charge to the NRC's Committee on Atlantic Salmon in Maine included an interim report focusing on the genetic makeup of Maine Atlantic salmon populations. This is the interim report. Understanding the genetic makeup of Maine's salmon is important for recovery efforts, because the degree to which populations in Maine differ from adjacent populations in Canada and the degree to which populations in different Maine rivers and tributaries differ from each other affect the choice of recovery options that are most likely to be effective. This report focuses only on questions of genetic distinctiveness. The committee's final report will address the broader issues, such as the factors that have caused Maine's salmon populations to decline and the options for helping them to recover.
Download or read book Atlantic Salmon Ecology written by Øystein Aas and published by John Wiley & Sons. This book was released on 2011-07-05 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Atlantic salmon is one of the most prized and exploited species worldwide, being at the centre of a massive sports fishing industry and increasingly as the major farmed species in many countries worldwide. Atlantic Salmon Ecology is a landmark publication, both scientifically important and visually attractive. Comprehensively covering all major aspects of the relationship of the Atlantic salmon with its environment, chapters include details of migration and dispersal, reproduction, habitat requirements, feeding, growth rates, competition, predation, parasitsm, population dynamics, effects of landscape use, hydro power development, climate change, and exploitation. The book closes with a summary and look at possible future research directions. Backed by the Norwegian Research Council and with editors and contributors widely known and respected, Atlantic Salmon Ecology is an essential purchase for all those working with this species, including fisheries scientists and managers, fish biologists, ecologists, physiologists, environmental biologists and aquatic scientists, fish and wildlife department personnel and regulatory bodies. Libraries in all universities and research establishments where these subjects are studied and taught should have copies of this important publication. Comprehensive and up-to-date coverage of Atlantic Salmon Atlantic Salmon is one of the world's most commercially important species Backed by the Norwegian Research Council Experienced editor and internationally respected contributors
Download or read book Age Growth and Mortality of Juvenile Atlantic Salmon in Streams written by Patrick W. Bley and published by . This book was released on 1987 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evolutionary Biology of the Atlantic Salmon written by Tomislav Vladić and published by CRC Press. This book was released on 2015-08-10 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atlantic salmon (Salmo salar, L) is an anadromous species contributing to major fishery catches and comprising a significant part of the aquaculturally produced fish for human consumption. The aim of this book is to incite the interest in the field of knowledge gathered from a broad scope of disciplines that have investigated this fish species. Und
Download or read book A Molecular telemetric Approach to Atlantic Salmon Reintroductions written by Andrew B. Harbicht and published by . This book was released on 2018 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: With increases to the number of species and populations impacted by human activities, the need for human involvement in their maintenance and/or conservation has grown in turn. This involvement increasingly takes the form of re-introductions, relocations, or supplementation of populations in decline or that have been lost. As a result, reintroduction biology has become a quickly growing field of research that attempts to answer the many questions related to reintroductions and translocations. When and how to release individuals into the wild, at what age should they be released, and in what situations is the introduction of new individuals sufficient to establish new populations. To advance our understanding of species reintroductions and address some of these questions in situ, adaptive management experiments and new techniques were developed for the Atlantic salmon reintroduction program in the Lake Champlain basin. These experiments assessed the suitability of commonly used methods in salmonid reintroduction and supplementation for re-establishing or strengthening self-sustaining populations and meta-population structure through direct comparisons of long-term survival, spawning returns, and dispersal rates. Concurrently, to address how changes in the species composition of Lake Champlain have affected the ability of reintroduced salmon to establish themselves, radio telemetry was employed to monitor spawning migrations through a challenging, high velocity section of the Boquet River, a tributary to Lake Champlain. In doing so, new, transferrable radio telemetric techniques for continuous fine scale monitoring were developed. In comparing alternative rearing/release techniques to the standard method of producing large 1+ parr through the use of elevated rearing temperatures, several significant trends were apparent. First, while fry (age 0+) are commonly held to exhibit reduced survival to adulthood relative to 1+ parr, once natural mortality during the first year was accounted for, fry returns exceeded those of standard production parr while their dispersal rates were more consistent with Atlantic salmon meta-populations. Second, all three alternative parr rearing/release methods reduced straying rates relative to standard methods. Third, while advancing release dates lowered parr-to-adult survival relative to standard procedures, using seasonal water temperatures prior to release significantly improved both survival and spawning returns. Once released, growing salmon fed on alewife, an invasive prey species containing thiaminase, which lowered thiamine levels among mature adults, potentially impacting energy levels and swimming performance. At a challenging, high velocity section of the Boquet River, we detected a significant effect of this thiamine deficiency on downstream movement rates from both high and low flow sections of the river as well as an effect of thiamine supplementation, particularly among male salmon. To confirm this, however, a new telemetric technique was required. We therefore developed a technique that successfully estimated the location of tagged salmon to within several meters using readily available equipment and statistical models. Overall, these results will assist the reintroduction efforts in Lake Champlain and their implications are highly transferrable to the reintroduction/supplementation of other at-risk or extirpated populations. The methods developed below are readily implementable and provide positive returns on investment, both over the short- and long-term, while representing a step forward for the reintroduction of species of high economic, cultural, and ecological importance.
Download or read book The timing of migration and changes in age structure of Atlantic salmon Salmo salar L in the River Frome a Dorset chalk stream over a 24 year period written by J S. Welton and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Lives of Salmon written by A. F. Youngson and published by Voyageur Press (MN). This book was released on 1996 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a popular scientific account of the biology of salmon and the biology of the populations to which they belong. It tells of the ways in which the salmon's lives are organised, why they vary so much and how this affects salmon fisheries.
Download or read book Genetic Status of Atlantic Salmon in Maine written by Committee on Atlantic Salmon in Maine and published by National Academies Press. This book was released on 2002-04-05 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atlantic salmon in Maine, once abundant but now seriously depleted, were listed as endangered under the federal Endangered Species Act (ESA) in November 2000. The listing covers the wild fish in eight Maine rivers as a single "distinct population segment." The controversy in Maine that accompanied the listing led Congress to request the National Research Council's (NRC's) advice on the science relevant to understanding and reversing the declines in Maine's salmon populations. The charge to the NRC's Committee on Atlantic Salmon in Maine included an interim report focusing on the genetic makeup of Maine Atlantic salmon populations. This is the interim report. Understanding the genetic makeup of Maine's salmon is important for recovery efforts, because the degree to which populations in Maine differ from adjacent populations in Canada and the degree to which populations in different Maine rivers and tributaries differ from each other affect the choice of recovery options that are most likely to be effective. This report focuses only on questions of genetic distinctiveness. The committee's final report will address the broader issues, such as the factors that have caused Maine's salmon populations to decline and the options for helping them to recover.
Download or read book A Comparative Study of Life Histories of Atlantic Salmon in Two Norwegian and Two Russian Rivers written by and published by Niku Norsk Institutt for Kulturminneforskning. This book was released on 1997 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecology and Management of Atlantic Salmon written by D. Mills and published by Springer Science & Business Media. This book was released on 1989-01-31 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews advances in the understanding of the biology, ecology and management of the Atlantic salmon throughout its geographical range, and examines the effects on salmon of afforestation, pollution, acid rain, water abstraction and changing agricultural methods. The rapid escalation of salmon farming with its impact on wild stocks is analyzed as is the increasing threat of over-exploitation on both the open seas and in home waters.
Download or read book Atlantic Salmon written by Andrew Barbour and published by Canongate Books. This book was released on 1992 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Centennial scale Influence of Climate Fishing and Artificial Production on Salmon Population Dynamics written by Michael Price and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pacific salmon (Oncorhynchus spp.) are common and abundant species with substantial population and life-history diversity. While several studies have documented shifts in salmon abundance and diversity over the last several decades, it has remained a challenge to understand changes over longer periods, such as the last century of major human impacts. Here, I use sockeye salmon (O. nerka) in the Skeena River watershed as a case study to quantify how population-specific abundance and diversity have responded to fishing, artificial production, and climatic change over the last century. In Chapter 2, I demonstrate that contemporary period data are at an all-time low, resulting in an inability to assess the health of one-half of salmon populations returning to British Columbia's mid coast, including over 50% of Skeena sockeye populations. Importantly, 40% of populations assessed as at-risk would have improved in status had Canadian fisheries exploitation been reduced. In Chapter 3, I show that sockeye populations were 56% to 99% larger one century ago, and that fisheries selectivity of larger-bodied populations is the most probable driver of differences in rates of decline between populations. In Chapter 4, I add 1933-1947 baseline data that, when combined with 1913-1923, demonstrate that the total number of wild sockeye now returning to the Skeena is 69% lower than during the historical era. While artificial enhancement has returned aggregate abundances to historical levels, declines across all wild populations has increased the dependency of fisheries on enhanced fish, and decreased the provisioning of salmon to local fisheries and ecosystems. In Chapter 5, I quantify the influence of competition and climate as filtered by habitat on the response diversity of sockeye populations, and model future potential effects of warming temperatures on fish growth. While growth was lower in years with high temperatures and intraspecific competition, population-specific habitat played an important role in modulating the negative effect of temperature. Collectively, this body of work improves our understanding of the magnitude of different responses of populations to a century of change in climate, fishing, and artificial production, which can help realize the potential resilience of salmon in watersheds like the Skeena to future environmental change.
Download or read book Genetic Diversity in Atlantic Salmon and Salmon Management in Relation to Genetic Factors written by Dag Møller and published by New York : International Atlantic Salmon Foundation. This book was released on 1970 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Atlantic Salmon written by David Shearer and published by Wiley. This book was released on 1992-11-10 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: William Shearer, an eminent biologist of international reputation, has devoted a lifetime to studying the Atlantic salmon. His book describes the life history of the Atlantic salmon, in the light of the results of the last thirty years' research. In addition, it details all aspects of the fisheries which exploit this valuable resource - their ownership and management, the different gears, past and present catches, the high seas fisheries and their possible effects on home-water stocks - and discusses the present status of the Atlantic salmon with special reference to Scotland. The results and implications of the author's North Esk research are discussed along with the effects of fish farming on wild stocks and the future of the salmon.
