Download or read book Growth and Abundance of Juvenile Fall Chinook Salmon in Sixes River Estuary 1969 written by Paul E. Reimers and published by . This book was released on 1970 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chinook Salmon Populations in Oregon Coastal River Basins written by J. W. Nicholas and published by . This book was released on 1989 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Length of Residence of Juvenile Fall Chinook Salmon in Sixes River Oregon written by Paul E. Reimers and published by . This book was released on 1971 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Abundance of Epibenthic and Planktonic Macrofauna and Feeding Habits of Juvenile Fall Chinook Salmon Oncorhynchus Tshawytscha in the Mattole River Estuary Lagoon Humboldt County California written by Morgan S. Busby and published by . This book was released on 1991 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Length weight Relationship of Fall Chinook Salmon in the Sixes River Sport Fishery 1969 written by Paul E. Reimers and published by . This book was released on 1975 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sport Fishery Abstracts written by and published by . This book was released on 1974 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Color Patterns and Morphology of Juvenile Coho and Fall Chinook Salmon in Sixes River Oregon written by Roy A. Stein and published by . This book was released on 1970 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Juvenile Chinook Salmon written by Douglas A. Young and published by . This book was released on 1987 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Reports of the Fish Commission of Oregon written by Oregon. Fish Commission and published by . This book was released on 1969 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Utilization of the Campbell River Estuary by Juvenile Chinook Salmon Oncorhynchus Tshawytscha in 1994 written by and published by . This book was released on 1997 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents an analysis of juvenile salmon population growth and abundance data collected in the Campbell River estuary in 1994 to describe chinook habitat use, residency timing, growth, and potential competitive interactions between wild chinook fry, hatchery chinook, and other salmon species. Results are compared with previous information on habitat use, residence timing, and growth of wild and hatchery chinook. Analyses are presented in five parts: use of a discriminant function to predict the origin of chinook juveniles whose origin could not be field-determined; estimation of density and biomass of juvenile salmon in the estuary and a comparison of habitat use and residence timing; calculation of growth rates for wild and hatchery chinook; prediction of wild chinook fry weight based on total salmon biomass; and estimation of the carrying capacity of the estuary for juvenile chinook, coho, and all salmon species combined, based on mark-recapture and escapement-biostandard methods.
Download or read book Fishery Bulletin written by and published by . This book was released on 1991 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Juvenile Chinook Salmon Oncorhynchus Tshawytscha Life History Diversity and Growth Variability in a Large Freshwater Tidal Estuary written by Pascale A. L. Goertler and published by . This book was released on 2014 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: For many fish and wildlife species, a mosaic of available habitats is required to complete their life cycle, and is considered necessary to ensure population stability and persistence. Particularly for young animals, nursery habitats provide opportunities for rapid growth and high survival during this vulnerable life stage. My thesis focuses on juvenile Chinook salmon (Oncorhynchus tshawytscha) and their use of estuarine wetlands as nursery habitat. Estuaries are highly productive systems representing a mosaic of habitats connecting rivers to the sea, and freshwater tidal estuaries provide abundant prey communities, shade, refuge from predation and transitional habitat for the osmoregulatory changes experienced by anadromous fishes. I will be discussing the freshwater tidal wetland habitat use of juvenile Chinook salmon in the Columbia River estuary, which are listed under the Endangered Species Act. I used otolith microstructural growth estimates and prey consumption to measure rearing habitat quality. This sampling effort was designed to target as much genetic diversity as possible, and individual assignment to regional stocks of origin was used to describe the diversity of juvenile Chinook salmon groups inhabiting the estuary. Diversity is important for resilience, and in salmon biocomplexity within fish stocks has been shown to ensure collective productivity despite environmental change. However much of the research which links diversity to resilience in salmon has focused on the adult portion of the life cycle and many resource management policies oversimplify juvenile life history diversity. When this oversimplification of juvenile life history diversity is applied to salmon conservation it may be ignoring critical indicators for stability. Therefore in addition to genetic diversity I also explore methods for better defining juvenile life history diversity and its application in salmon management, such as permitting requirements, habitat restoration, hydropower practices and hatchery management. This study addresses how juvenile salmon growth changes among a range of wetland habitats in the freshwater tidal portion of the Columbia River estuary and how growth variation describes and contributes to life history diversity. To do this, I incorporated otolith microstructure, individual assignment to regional stock of origin, GIS habitat mapping and diet composition, in three habitats (mainstem river, tributary confluence and backwater channel) along ~130 km of the upper estuary. For my first chapter I employed a generalized linear model (GLM) to test three hypotheses: juvenile Chinook growth was best explained by (1) temporal factors, (2) habitat use, or (3) demographic characteristics, such as stock of origin or the timing of seaward migration. I found that variation in growth was best explained by habitat type and an interaction between fork length and month of capture. Juvenile Chinook salmon grew faster in backwater channel habitat and later in the summer. I also found that mid-summer and late summer/fall subyearlings had the highest estuarine growth rates. When compared to other studies in the basin these juvenile Chinook grew on average 0.23, 0.11-0.43 mm/d in the freshwater tidal estuary, similar to estimates in the brackish estuary, but ~4 times slower than those in the plume and upstream reservoirs. However, survival studies from the system elucidated a possible tradeoff between growth and survival in the Columbia River basin. These findings present a unique example of the complexity in understanding the influences of the many processes that generate variation in growth rate for juvenile anadromous fish inhabiting estuaries. In my second chapter, I used otolith microstructure and growth trends produced in a dynamic factor analysis (DFA, a multivariate time series method only recently being used in fisheries) to identify the life history variation in juvenile Chinook salmon caught in the Columbia River estuary over a two-year period (2010-2012). I used genetic assignment to stock of origin and capture location and date with growth trajectories, as a proxy for habitat transitions, to reconstruct life history types. DFA estimated four to five growth trends were present in juvenile Chinook salmon caught in the Columbia River estuary, diversity currently being simplified in many management practices. Regional stocks and habitats did not display divergent growth histories, but the marked hatchery fish did ordinate very similarly in the trend loadings from the DFA analysis, suggesting that hatchery fish may not experience the same breadth of growth variability as wild fish. I was not able to quantify juvenile life history diversity, and juvenile Chinook life history diversity remains difficult to catalog and integrate into species conservation and habitat restoration for resource management. However, by expanding our understanding of how juvenile Chinook salmon experience their freshwater rearing environment we improve our capacity to conserve and manage salmon populations. The findings from my thesis provide the necessary information for a restoration framework to link habitat features with salmon management goals, such as juvenile growth, wild and genetic origin and life history diversity.
Download or read book Juvenile Chinook Salmon Abundance Distribution and Survival in the Sacramento San Joaquin Estuary written by Patricia L. Brandes and published by . This book was released on 2000 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Need for Research on the Estuarine Ecology of Juvenile Fall Chinook Salmon written by Paul E. Reimers and published by . This book was released on 1978 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Reports written by Oregon. Fish Commission and published by . This book was released on 1969 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 1987 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Abundance and Survival of Juvenile Chinook Salmon in the Sacramento San Joaquin Estuary written by and published by . This book was released on 2003 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
