Download or read book Survival and Migration Dynamics of Juvenile Chinook Salmon Oncorhynchus Tshawytscha in the Sacramento San Joaquin River Delta written by Russell W. Perry and published by . This book was released on 2010 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Survival and Migration Route Probabilities of Juvenile Chinook Salmon in the Sacramento San Joaquin River Delta During the Winter of 2009 10 written by U.S. Department Of The Interior and published by CreateSpace. This book was released on 2014-03 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Juvenile Chinook salmon (Oncorhynchus tshawytscha) emigrating from natal tributaries of the Sacramento River may use a number of migration routes to negotiate the Sacramento-San Joaquin River Delta (hereafter, "the Delta"), each of which may influence their probability of surviving. We applied a mark-recapture model to data from acoustically tagged juvenile late-fall Chinook salmon that migrated through the Delta during the winter of 2009-10 (hereafter, 2010). This report presents findings from our fourth year of research.
Download or read book The Regional Salmon Outmigration Study survival and Migration Routing of Juvenile Chinook Salmon in the Sacramento San Joaquin River Delta During the Winter of 2008 09 written by U.S. Department Of The Interior and published by CreateSpace. This book was released on 2014-03 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Juvenile Chinook salmon (Oncorhynchus tshawytscha) emigrating from natal tributaries of the Sacramento River may use a number of migration routes to navigate the Sacramento-San Joaquin River Delta (hereafter called "the Delta"), each of which may influence their probability of surviving. We applied a mark-recapture model to data from acoustically tagged juvenile late fall-run Chinook salmon that migrated through the Delta during the winter of 2008-09 to estimate route entrainment, survival, and migration times through the Delta.
Download or read book River Estuarine Survival and Migration of Yearling Sacramento River Chinook Salmon Oncorhynchus Tshawytscha Smolts and the Influence of Environment written by Cyril J. Michel and published by . This book was released on 2010 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Needs of Chinook Salmon Oncorhynchus Tshawytscha in the Sacramento San Joaquin Estuary written by and published by . This book was released on 1987 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Outmigration Survival of Juvenile Spring run Chinook Salmon in Relation to Physicochemical Conditions in the San Joaquin River written by Colby Hause and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Extirpation of Central Valley spring-run Chinook salmon ESU (Oncorhynchus tshawytscha) from the San Joaquin River is emblematic of salmonid declines across the Pacific Northwest. Previous telemetry studies monitoring reintroduction of threatened spring-run Chinook salmon to the San Joaquin River revealed low out-migration survival of juveniles from rehabilitated upriver habitats to the ocean. To evaluate the link between overall habitat conditions and survivorship, we combined state-of-the-art habitat mapping approaches (Fast Automated Limnological Measurements or "FLAMe") with classic acoustic telemetry technology along the 270 km emigration corridor in Spring of 2019. We used classification algorithms on FLAMe data to develop a zonation scheme for aquatic habitats along the mainstem San Joaquin River, including a portion of the Delta. Despite elevated flow conditions in 2019, outmigration survival of smolts was again comparatively low (5%). However, our habitat-based classification scheme described variation in survival of acoustic-tagged juvenile spring-run Chinook salmon better than other candidate models based on geography or distance. Two regional mortality sinks were evident along the water quality transect, revealing poor survival in areas with higher temperatures and low levels of chlorophyll-[alpha], fDOM, and turbidity. These findings illustrate an overall value in integrating simple classification frameworks to improve our understanding of habitat variation on survival dynamics of imperiled salmonid populations.
Download or read book Survival and Migration Route Probabilities of Juvenile Chinook Salmon in the Sacramento San Joaquin River Delta During the Winter of 2007 2008 written by Russell W. Perry and published by . This book was released on 2009 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Survival and Migration Route Probabilities of Juvenile Chinook Salmon in the Sacramento San Joaquin River Delta During the Winter of 2009 10 written by Russell W. Perry and published by . This book was released on 2012 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distribution and Joint Fish Tag Survival of Juvenile Chinook Salmon Migrating Through the Sacramentro San Joaquin River Delta California 2008 written by U.S. Department of the Interior and published by CreateSpace. This book was released on 2014-03-30 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chinook salmon in California's Central Valley were decimated in the 19th and 20th centuries by overfishing, dam construction, channelization, population, and water diversions.
Download or read book The Regional Salmon Outmigration Study written by Jason G. Romine and published by . This book was released on 2013 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distribution and Joint Fish tag Survival of Juvenile Chinook Salmon Migrating Through the Sacramento San Joaquin River Delta California 2008 written by Christopher M. Holbrook and published by . This book was released on 2009 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Analysis of Juvenile Chinook Salmon Outmigration Speed and Survival in Response to Habitat Features Sacramento River from Knights Landing to Sacramento California written by Natalie N McNair and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Outmigration is an important life stage for Chinook salmon (Oncorhynchus tshawytscha) survival in the Sacramento River, and yet our understanding of their behavior and needs during this time is limited. To gain a better understanding of their survival and movement rates during outmigration, late fall run Chinook salmon smolts were tracked using acoustic telemetry techniques. Habitat features were measured and quantified throughout the study area to evaluate how Chinook salmon respond to key levee features including shade, instream woody material, and aquatic vegetation. The overall average movement speed through the entire study area was 0.77 m/s with an overall survival of 86%. Based on multiple linear regressions, vegetation was found to have the largest effect on speed with fish slowing down with increased vegetation cover. Shade, river mile, and velocity also had significant effects on movement speeds, but instream woody material was not significant. The result for woody material was surprising since it was anticipated to have a large impact on movement speeds. A positive correlation was found between faster fish movement speeds and higher survival. No evidence of diel movement patterns was found after releasing the fish. These finding can help managers create sites better designed to help Chinook salmon in the Sacramento River system. Results from this paper indicate that the type of woody material being installed might not be appropriate for this life stage of salmon.
Download or read book Movement and Survival of Juvenile Chinook Salmon in California s Central Calley written by Gabriel P. Singer and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Riverine ecosystems around the world have undergone extensive anthropogenic alterations, often to the detriment of native aquatic biodiversity. Migratory fishes are particularly vulnerable to habitat fragmentation and degradation. For example, Chinook Salmon populations in the Sacramento and San Joaquin Rivers, CA have been declining for nearly a century. Its Mediterranean climate, position in a landscape dominated by urban and agricultural land use, and the presence of an inland delta that serves as the hub of California's vast water conveyance system, makes this a particularly perilous region for migrating juvenile salmon. These studies use acoustic telemetry as tool to investigate survival and routing of juvenile fall and spring-run Chinook salmon during their riverine and estuarine migratory phases in the Sacramento and San Joaquin Rivers. Survival to the ocean in these river systems is already lower relative to other Chinook Salmon populations in North American. Tracking studies included investigations of the sub-lethal effects of tagging fish with acoustic transmitters, movement ecology and survival of two distinct evolutionary significant units of Chinook Salmon during an historic drought, and the movement ecology and survival of a reintroduced population of Chinook Salmon in the San Joaquin River.
Download or read book Survival of Chinook Salmon Smolts in the Sacramento San Joaquin Delta and Pacific Ocean written by Peter Fritz Baker and published by . This book was released on 200? with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper summarizes current knowledge about the effects of river flow and water export on the survival of San Joaquin River Basin Chinook salmon smolts migrating through the Sacramento-San Joaquin Delta.
Download or read book An Evaluation of Four Sacramento San Joaquin River Delta Juvenile Salmon Survival Studies written by Ken B. Newman and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Movements of Juvenile Chinook Salmon in the Sacramento Watershed California written by Anna Edith Steel and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Juvenile Chinook salmon (Oncorhynchus tshawytscha) experience high rates of mortality as they out-migrate, frequently navigating through rivers heavily modified by human activities. Understanding patterns of movement and survival is key to informing management decisions in these human-dominated aquatic systems. Ultrasonic telemetry is a valuable tool allowing us to observe the movement patterns of aquatic animals. The first chapter of this dissertation examines the performance of an ultrasonic telemetry positioning system by comparing receiver arrays deployed in three diverse environments. It suggests that researchers utilizing a positioning system should focus on testing the geometry of receivers before the study begins, as well as minimizing receiver movements and maximizing the accuracy of speed-of-sound estimates. The second chapter uses an ultrasonic positioning system to observe the route selection of juvenile out-migrants at an artificial juncture in the tidal portion of the Sacramento River, California. The strongest predictor of ultimate migratory route was the relative water velocity at the river's junction with the water diversion channel. The third chapter describes patterns in survival through a segment of the lower Sacramento River. We applied a previously derived analytical model, the mean free-path length model, in a new way to determine whether predator densities or prey behaviors were more indicative of fine-scale mortality rates. The model indicated that the hatchery smolt were highly directional in their outmigration behavior, leading us to conclude that spatial patterns in survival of juvenile Chinook were driven by increasing density or efficiency of the predator community. Ultrasonic telemetry technologies can be valuable in habitats where direct observation of animals is difficult, including in large river systems such as the Sacramento River. Through the continuing advancement of these technologies, their careful application, and the appropriate union of empirical data and modeling approaches, we can provide valuable information about the movements and mortality patterns of species of conservation concern.
Download or read book Out Migration Survival of Wild Chinook Salmon Oncorhynchus Tshawytscha Smolts from Mill Creek Through the Sacramento River During Drought Conditions written by Jeremy Notch and published by . This book was released on 2017 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: Once emerged from the gravel after being spawned in natal streams, Chinook salmon spend many months rearing and growing in freshwater before undergoing smoltification and out-migrating to the ocean. This relatively short period of time is considered to be the most vulnerable and dangerous phase in the life cycle of a Pacific salmon. It is during this phase when smolts navigate around many anthropogenic structures and experience environmental stressors while making their way to the ocean. In California's Central Valley, the few remaining wild populations of Chinook salmon (Oncorhynchus tshawytscha) out-migrate through a highly modified riverine and estuary landscape characterized by leveed banks, altered flow and temperature regimes, transformed food webs, and limited floodplain and rearing habitat. Juvenile salmon smolts migrate through these landscapes within a relatively short period of time, requiring them to quickly adapt to changing water conditions and habitat types. Understanding the survival rates of wild smolts from source tributaries to the Pacific Ocean is essential in protecting and restoring these populations from the low abundances currently observed. When faced with drought conditions out-migrating smolts experience low flows, elevated water temperatures and high densities of predators while out-migrating to sea. In order to assess smolt survival during drought conditions in late spring (April-May), 304 wild smolts were acoustically tagged and tracked from Mill Creek (Tehama County) to the Pacific Ocean between 2013 and 2016. Total outmigration survival to the ocean was 0.3% during these years, with only one fish making it to the Golden Gate and the Pacific Ocean. These survival estimates are some of the lowest ever recorded for salmon out-migrating to the Pacific Ocean, with much of the mortality occurring within Mill Creek and the Sacramento River. Cumulative survival through Mill Creek (rkm 452--441) was 68% (+/-12 S.E.), and cumulative survival through the Sacramento River (rkm 441--203) was 7.6% (+/- 16 S.E.) These low survival rates are likely attributed to low flows in Mill Creek and the Sacramento River resulting from critically dry winters between 2013 and 2015, which were reduced even further by water diversions for agriculture in both Mill Creek and the Sacramento River. During periods of higher flow in 2016 survival rates dramatically increased, suggesting that more water in Mill Creek and the Sacramento River is necessary to improve in-river smolt migration survival during the late spring.
