Download or read book Impacts of Cumulative Thermal and Fishery Stressors and Infection Development on the Health and Survival of Adult Pacific Salmon During Freshwater Residence written by Amy Teffer and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cumulative stressors influence the infection development, health and survival of wild Pacific salmon (Oncorhynchus spp.). Infectious disease is generally assumed to be the ultimate cause of death of wild adult salmon, but empirical evidence demonstrating links between infections and early mortality (i.e., prior to spawning) is lacking, especially as a function of cumulative migratory stressors. The influences of high river temperature and fishery capture and release on infection development and early mortality was explored in three Pacific salmon species. Adults were captured at river entry and held in freshwater tanks for the duration of river migration (days-weeks). Tank temperatures reflected either optimal (cool), warm (climate change scenario), or dynamic (changes in river temperature, behavioral thermoregulation) thermal conditions during migration. A subset of fish in all temperature groups was treated with a fishery bycatch release simulation (gillnet entanglement, air exposure) at the start of the holding period. We tracked shifts in physiology, immune activity and multiple infections using repeated biopsy (gill, blood) and molecular tools. Laboratory experiments were complimented by a telemetry study to assess impacts on behavior in the river. Novel application of high-throughput qPCR on nonlethally-sampled gill measured infections (bacteria, viruses, protozoa) concurrently with host immune gene expression, and was complemented by blood plasma chemistry to assess physiology. Ecologically relevant high temperatures increased mortality, infection development and stress metabolites and impaired host osmoregulatory function. Fishery stress reduced survival, especially after long entanglements and at high temperature, which reduced the capacity of individuals to resolve stress and infections. Females were more drastically affected, and mortality was delayed by more than a week. Fish with heavy infections in the river migrated more rapidly but traveled less distance. Sublethal effects of stressors included reduced migration rates and suppressed maturation indices that could delay maturity and extend river residence. Finally, river-exposed fish carried heavier infections and died sooner than those that bypassed the lower river, suggesting a causal influence of infections on early mortality. These findings support river-derived infections as causal factors contributing to the early mortality of adult Pacific salmon in fresh water and clarify its mechanisms, which comprise influences of multiple infections, sex, species, water temperature and fishery stress.
Download or read book Climate Impacts on Pacific Salmon written by Richard James Beamish and published by . This book was released on 2010 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physiological Ecology of Pacific Salmon written by Cornelis Groot and published by UBC Press. This book was released on 2010-10-01 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Upstream written by National Research Council and published by National Academies Press. This book was released on 1996-08-17 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: The importance of salmon to the Pacific Northwestâ€"economic, recreational, symbolicâ€"is enormous. Generations ago, salmon were abundant from central California through Idaho, Oregon, and Washington to British Columbia and Alaska. Now they have disappeared from about 40 percent of their historical range. The decline in salmon numbers has been lamented for at least 100 years, but the issue has become more widespread and acute recently. The Endangered Species Act has been invoked, federal laws have been passed, and lawsuits have been filed. More than $1 billion has been spent to improve salmon runsâ€"and still the populations decline. In this new volume a committee with diverse expertise explores the complications and conflicts surrounding the salmon problemâ€"starting with available data on the status of salmon populations and an illustrative case study from Washington state's Willapa Bay. The book offers specific recommendations for salmon rehabilitation that take into account the key role played by genetic variability in salmon survival and the urgent need for habitat protection and management of fishing. The committee presents a comprehensive discussion of the salmon problem, with a wealth of informative graphs and charts and the right amount of historical perspective to clarify today's issues, including: Salmon biology and geographyâ€"their life's journey from fresh waters to the sea and back again to spawn, and their interaction with ecosystems along the way. The impacts of human activitiesâ€"grazing, damming, timber, agriculture, and population and economic growth. Included is a case study of Washington state's Elwha River dam removal project. Values, attitudes, and the conflicting desires for short-term economic gain and long-term environmental health. The committee traces the roots of the salmon problem to the extractive philosophy characterizing management of land and water in the West. The impact of hatcheries, which were introduced to build fish stocks but which have actually harmed the genetic variability that wild stocks need to survive. This book offers something for everyone with an interest in the salmon issueâ€"policymakers and regulators in the United States and Canada; environmental scientists; environmental advocates; natural resource managers; commercial, tribal, and recreational fishers; and concerned residents of the Pacific Northwest.
Download or read book Pacific Salmon their Ecosystems written by Deanna J. Stouder and published by Springer Science & Business Media. This book was released on 2012-02-02 with total page 681 pages. Available in PDF, EPUB and Kindle. Book excerpt: The symposium "Pacific Salmon and Their Ecosystems: Status and Future Options',' and this book resulted from initial efforts in 1992 by Robert J. Naiman and Deanna J. Stouder to examine the problem of declining Pacific salmon (Oncorhynchus spp.). Our primary goal was to determine informational gaps. As we explored different scientific sources, state, provincial, and federal agencies, as well as non-profit and fishing organizations, we found that the information existed but was not being communicated across institutional and organizational boundaries. At this juncture, we decided to create a steering committee and plan a symposium to bring together researchers, managers, and resource users. The steering committee consisted of members from state and federal agencies, non-profit organizations, and private industry (see Acknowledgments for names and affiliations). In February 1993, we met at the University of Washington in Seattle to begin planning the symposium. The steering committee spent the next four months developing the conceptual framework for the symposium and the subsequent book. Our objectives were to accomplish the following: (1) assess changes in anadromous Pacific Northwest salmonid populations, (2) examine factors responsible for those changes, and (3) identify options available to society to restore Pacific salmon in the Northwest. The symposium on Pacific Salmon was held in Seattle, Washington, January 10-12, 1994. Four hundred and thirty-five people listened to oral presentations and examined more than forty posters over two and a half days. We made a deliberate attempt to draw in speakers and attendees from outside the Pacific Northwest.
Download or read book From the Edge written by and published by . This book was released on 2000 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Impacts of climate change on fisheries and aquaculture written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 2019-01-06 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report indicates that climate change will significantly affect the availability and trade of fish products, especially for those countries most dependent on the sector, and calls for effective adaptation and mitigation actions encompassing food production.
Download or read book Pacific Salmon Life Histories written by Cornelis Groot and published by UBC Press. This book was released on 1991 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Effects of Temperature on Diseases of Salmonid Fishes written by John L. Fryer and published by . This book was released on 1974 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pacific Salmon written by William Hagen and published by . This book was released on 1953 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biology of Stress in Fish written by Carl B. Schreck and published by Academic Press. This book was released on 2016-11-01 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biology of Stress in Fish: Fish Physiology provides a general understanding on the topic of stress biology, including most of the recent advances in the field. The book starts with a general discussion of stress, providing answers to issues such as its definition, the nature of the physiological stress response, and the factors that affect the stress response. It also considers the biotic and abiotic factors that cause variation in the stress response, how the stress response is generated and controlled, its effect on physiological and organismic function and performance, and applied assessment of stress, animal welfare, and stress as related to model species. Provides the definitive reference on stress in fish as written by world-renowned experts in the field Includes the most recent advances and up-to-date thinking about the causes of stress in fish, their implications, and how to minimize the negative effects Considers the biotic and abiotic factors that cause variation in the stress response
Download or read book Understanding the Consequences of Fisheries related Stressors on Adult Migrating Pacific Salmon written by Michael Ryan Donaldson and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Warming and Hypoxia as Individual and Combined Stressors on the Survival Physiology and Development of Early Life Stage Chinook Salmon written by Annelise Mary Del Rio and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chinook salmon (Oncorhynchus tshawytscha) populations in the Central Valley of California are the most vulnerable to climate variability within the species (Crozier et al., 2019). Major threats include climate change, habitat loss, and water management infrastructure. Early life stages of salmon are particularly susceptible to stressors related to these threats because they have little to no ability to swim away from sub-optimal conditions within the incubation environment. Instead, they must rely on internal physiological responses to cope with stressors. Developing salmon thrive in cool, well-oxygenated water; however, warming and hypoxia (low dissolved oxygen) are two stressors that are prevalent within the gravel redds. Few studies have examined the effects of multiple, co-occurring stressors on salmon embryos, but warming and hypoxia are likely to interact because of opposing effects on metabolic rate and physiological performance. The interaction between warming and hypoxia may have contributed to recent high embryo mortality in an endangered population of Sacramento River salmon, where low flows and resulting hypoxia are hypothesized to have reduced the thermal tolerance of salmon embryos (Martin et al. 2017). In this dissertation I examined the effects of warming and hypoxia on the survival and physiology of early life stage Chinook salmon in laboratory and field studies. Rearing embryos under chronic hypoxia resulted in higher mortality, especially in combination with warming, and affected upper thermal tolerance and hypoxia tolerance (Chapter 2). In Chapter 3, I investigated how the timing of exposure to warming, hypoxia, or both stressors affected early life stages during the exposure and found that exposure to both stressors had the greatest effect on hatching, growth, and metabolic rate if embryos were chronically exposed to these stressors during their entire embryogenesis or if they were only exposed late in embryogenesis, shortly before hatch. Furthermore, salmon developmental rate, metabolic rate, and acute stress tolerance continued to be affected in the alevin and fry even though they were transferred to control conditions following hatch, suggesting there are lasting effects of early stress exposure on the physiological performance of juvenile salmon. In Chapter 4, I conducted a field experiment to study how natural water quality variables, with a focus on dissolved oxygen and temperature, affected salmon embryo hatching and survival within artificial redds on the American River near Sacramento, California. Overall, hatching success was low, in part because of poor egg quality. Intergravel dissolved oxygen was highly variable and contributed to differences in embryo survival among the redds, along with intergravel temperature and water flow above the redds. Overall, these studies indicate that the interactions between temperature and dissolved oxygen affect key aspects of early salmon development and physiology in different ways than the individual stressors. My dissertation should help to inform management strategies to improve early life stage salmon survival in Central Valley rivers such as dam management plans for river flows that consider dissolved oxygen and water temperature for salmon.
Download or read book Progress Report International Pacific Salmon Fisheries Commission written by International Pacific Salmon Fisheries Commission and published by . This book was released on 1966 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Species Profiles written by Scott A. Bonar and published by . This book was released on 1989 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Impacts of Climate Change on Human Health in the United States written by US Global Change Research Program and published by Simon and Schuster. This book was released on 2018-02-06 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: As global climate change proliferates, so too do the health risks associated with the changing world around us. Called for in the President’s Climate Action Plan and put together by experts from eight different Federal agencies, The Impacts of Climate Change on Human Health: A Scientific Assessment is a comprehensive report on these evolving health risks, including: Temperature-related death and illness Air quality deterioration Impacts of extreme events on human health Vector-borne diseases Climate impacts on water-related Illness Food safety, nutrition, and distribution Mental health and well-being This report summarizes scientific data in a concise and accessible fashion for the general public, providing executive summaries, key takeaways, and full-color diagrams and charts. Learn what health risks face you and your family as a result of global climate change and start preparing now with The Impacts of Climate Change on Human Health.
Download or read book Pathways to Resilience written by Daniel L. Bottom and published by . This book was released on 2011 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
