Download or read book Age Growth and Life History of Steelhead Rainbow Trout Oncorhynchus Mykiss in the Lower Yuba River California written by William T. Mitchell and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Age Growth and Life History of Klamath River Basin Steelhead Trout Oncorhynchus Mykiss Irideus as Determined from Scale Analysis written by James S. Hopelain and published by . This book was released on 1998 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Age and Growth of Steelhead Rainbow Trout Oncorhynchus Mykiss in the Big Sur River written by Cynthia Collin and published by . This book was released on 1998 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study characterized age and length at spawning, age and length at smolting, and range and frequency of adult sizes of the Big Sur River steelhead population.
Download or read book Summer Distribution Abundance and Movements of Rainbow Trout Oncorhynchus Mykiss and Other Fishes in the Lower Yuba River California written by Jeffrey F. Kozlowski and published by . This book was released on 2004 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Life Histories of the Steelhead Rainbow Trout Salmo Gairdneri Gairdneri and Silver Salmon Oncorhynchus Kisutch with Special Reference to Waddell Creek California and Recommendations Regarding Their Management written by Leo Shapovalov and published by . This book was released on 1954 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Age and Growth of the Steelhead Rainbow Trout in Two Northern California Streams written by Jeffrey Lehn Gidley and published by . This book was released on 1982 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecological Relation of Sympatric Steelhead and Resident Rainbow Trout in the Deschutes River Oregon written by Christian E. Zimmerman and published by . This book was released on 2000 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sympatric steelhead and resident rainbow trout (Oncorhynchus mykiss) are known to exist in many rivers throughout the Pacific Rim. Whether sympatric steelhead and resident rainbow trout are polymorphisms within a single gene pool or two reproductively isolated populations has significant implications concerning the study and conservation of this polytypic species. I examined population structure and use of spawning and rearing habitats by steelhead and resident rainbow trout in the Deschutes River, Oregon. I used otolith microchemistry to determine the maternal origin (steelhead verses resident) of adult steelhead and resident rainbow trout based on Sr/Ca ratios in primordia and freshwater growth regions of otoliths. Only steelhead of steelhead origin and resident rainbow trout of resident origin were encountered. In the Babine River of British Columbia, however, steelhead of resident origin and resident rainbow trout of steelhead origin were present. Temporal and spatial segregation of spawning habitat served to limit breeding between steelhead and resident rainbow trout in the mainstem Deschutes River. The timing of 50% spawning by steelhead occurred 9 to 10 weeks earlier than by resident rainbow trout. Steelhead spawning sites were deeper and of larger substrate than those used by resident rainbow trout. There was an overlap in the timing of emergence by steelhead and resident rainbow trout fry in the mainstem Deschutes River, but higher levels of aggression and territoriality characterize newly emerged steelhead fry. Determination of maternal origin based on otolith microchemistry indicated that young-of- year 0. mykiss in small hydrologically unstable tributaries to the Deschutes River were exclusively the progeny of steelhead. Progeny of resident rainbow trout numerically dominated mainstem-rearing habitats. Based on the degree of segregation between steelhead and resident rainbow trout, the two life history forms act as two separate species in the Deschutes River. This relationship has significant implications concerning the restoration and conservation of steelhead and resident rainbow trout. Where steelhead and resident rainbow trout constitute reproductively isolated populations, conservation of both life history forms within the species cannot be achieved unless both populations are maintained.
Download or read book The Steelhead Trout written by Trey Combs and published by . This book was released on 1971 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Early Life Growth and Precipitation Zone on Survival to Adulthood in Wild Steelhead Trout Oncorhynchus Mykiss in the Skagit River Basin WA written by Jamie N. Thompson and published by . This book was released on 2013 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wild Steelhead Trout, Oncorhynchus mykiss, in the Puget Sound are currently in decline, and very little is known about the early life history of these threatened fish. This study evaluated consequences of early life growth in terms of survival to smolt or adult stages. The objectives of this study were to determine whether significant size-selective mortality (SSM) in Steelhead could be detected between freshwater stages and returning adults; and if so, how the magnitude of size selectivity varied among reaches categorized by three different precipitation zones (snow, mixed rain-snow, or rain). Wild Steelhead in the Skagit River basin were sampled as juveniles, smolts, and adults, and scales were measured to compare back-calculated freshwater growth rates and size distributions of rearing juveniles with individuals that survived from an earlier life stage to the smolt and adult stages. Linear regression of scale radius (SR) and fork length indicated that SR was a reasonable predictor of fork length during freshwater residency. Back-calculated size-at-annulus estimates indicated that fish sampled as adults grew significantly faster to age 1, 2, and 3 annuli compared to fish sampled as juveniles, and faster to the age 2 and 3 annuli compared to fish sampled as smolts. Within precipitation zones, fish sampled as juveniles were consistently smaller at each freshwater annulus compared to those same freshwater annuli on fish sampled as adults. An increased disparity in size-at-annuli 2 and 3 between fish sampled as juveniles, smolts, and adults suggests that fast growth during the period at which Steelhead smoltify is vitally important to survival to adulthood. These findings provide evidence that survival among life stages is an important dynamic in wild Steelhead, and can be attributed, in part, to size attained at earlier life stages. Efforts for recovery of threatened Puget Sound Steelhead could benefit by considering growth- and size-selective mortality in freshwater environments, and identifying factors that limit early life growth at a finer scale of habitat, for example among sub-basins or precipitation zones.
Download or read book Should I Stay Or Should I Go written by Geoff Koch and published by . This book was released on 2015 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Steelhead are the sea-going form of Oncorhynchus mykiss. Rainbow trout, also O. mykiss, remain in freshwater. Each form, or life-history, can produce offspring of the other, but the mechanism for this and potential effects that climate change may have on the species are poorly understood. Forest Service scientist Gordie Reeves, along with colleagues from other federal agencies and Oregon State University, conducted a series of studies to better document the biological processes that affect the life-history expression of O. mykiss. They found that standard metabolic rate and lipid levels play important roles: those fish with higher metabolisms and lower lipid levels tended to be steelhead, while those with lower metabolisms and higher lipid levels tended to be resident rainbows. Reeves' findings challenge the existing theory that faster growing individuals of the species tend to be seagoing steelhead. The research examined the effects of water temperature on life-history expression within the species. These findings offer clues about how climate change may affect the rainbow steelhead ratio in the years ahead. This research informs habitat improvement efforts and protection for steelhead populations, which are listed under the Endangered Species Act. It provides context, revealing how their life-history is interconnected with that of rainbow trout, which are not listed.
Download or read book Born to Run written by Matthew R. Sloat and published by . This book was released on 2013 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Steelhead and rainbow trout are common names for marine-migratory (anadromous) and freshwater-resident forms of Oncorhynchus mykiss, a partially migratory salmonid fish. Anadromous and resident forms are sympatric and can produce offspring with a life history different from their own (i.e., steelhead parents can produce rainbow trout offspring and vice versa). The expression of these alternative life histories is a plastic response to individual patterns of energy acquisition, assimilation, and allocation during juvenile life stages. Individual performance during early stream life is of particular interest because of potential carry-over effects on subsequent growth and developmental trajectories. In a series of experiments in laboratory streams, I determined the influence of individual variation in energy metabolism on behavior, growth, and life-history expression in O. mykiss. Individual variation in energy metabolism was a strong predictor of feeding territory acquisition by juvenile fish during the transition from dependence on maternal provisioning of egg yolk reserves to independent feeding. Feeding territory acquisition was positively associated with standard metabolic rate (SMR) under conditions of an abundant and predictable food supply. When the density of intraspecific competitors was manipulated, the association between SMR and territory acquisition was strongest at intermediate stocking densities, moderate at the highest stocking densities, and weakest at the lowest stocking densities. However, reducing the spatial predictability of food resources within streams reversed the influence of SMR on competitive outcomes. These experiments determined that variation in ecological conditions during early life stages imposes different selection regimes on juvenile O. mykiss and results in physiological divergence among cohorts. Subsequent rearing experiments determined that behavioral dominance influences rates of anadromy and freshwater maturation, most likely through the association between SMR and territory acquisition. In addition to the effects of behavioral dominance, I observed a significant influence of sex, rearing temperature, and individual growth trajectories on the expression of anadromy and freshwater maturation. Partially migratory populations of O. mykiss maintain an exceptionally diverse portfolio of life-history strategies. Results from this work lend insight into a suite of behavioral and physiological processes influencing individual life histories.
Download or read book Steelhead rainbow Trout Oncorhynchus Mykiss Resources South of the Golden Gate California written by Gordon S. Becker and published by . This book was released on 2008 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Possible Decline in the Half pounder Life History Among Trinity River Steelhead Oncorhynchus Mykiss written by Matt L. Peterson and published by . This book was released on 2011 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Historical Distribution and Current Status of Steelhead rainbow Trout Oncorhynchus Mykiss in Streams of the San Francisco Estuary California written by R. A. Leidy and published by . This book was released on 2005 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Age and Growth Characteristics of Rainbow Trout Oncorhynchus Mykiss in Little River Watershed Great Smoky Mountains National Park written by Stephanie K. Masterson and published by . This book was released on 1991 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Life History Patterns of the Mattole River Steelhead Oncorhynchus Mykiss written by Kathy Lynn Day and published by . This book was released on 1996 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Comparison of Growth Rates of Wild Rainbow Trout Oncorhynchus Mykiss in the Upper Sacramento River Before and After the Cantara Spill of 1991 written by Stanley C. Glowacki and published by . This book was released on 2003 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
