Download or read book Subpopulation Structure of Steelhead Trout Oncorhynchus Mykiss in the Middle Fork Eel River as Determined by Microsatellite DNA Polymorphisms written by Anthony J. Clemento and published by . This book was released on 2006 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecology and Distribution of Steelhead Oncorhynchus Mykiss in the Eel River California written by Samantha Heather Kannry and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Run-timing in salmonids is a prime example to study adaptive complexity in an iconic, culturally and economically important species. The Eel River in Northwestern California represents the southernmost extant population of summer-run steelhead in North America and is at the near-limit of the species’ thermal tolerance. It therefore presents an ideal location to examine the genetic basis for run-timing variations. Here we examine a number of issues related to steelhead conservation: 1) the extent to which upstream passage is blocked by ostensible physical barriers to dispersal; 2) spawning and rearing distribution of the two run-timings; 3) distribution of resident and anadromous genotypes; and 4) genetic diversity in a population of resident trout isolated above an impassable dam for nearly a century. Using Rapture (RAD Capture), we called genotypes at the region diagnostic for run-timing (GREB1L) and the region strongly associated with residency/anadromy in steelhead (OMY5). Remarkably, we concluded steelhead are passing a waterfall that has been managed as a complete barrier to anadromy. We also observed distinct spatial segregation between winter and summer-run steelhead in both the Middle Fork Eel and Van Duzen Rivers. Finally, we found evidence that prior to dam construction, summer-run steelhead inhabited the upper mainstem Eel, and that both life-history and overall genetic diversity are currently maintained in the resident trout population. Resident trout above the dam are well-suited to re-colonize the upper watershed if upstream passage were to be restored through the upcoming FERC re-licensing process.
Download or read book The Effect of Landscape Features on the Genetic Structure and Diversity of Steelhead and Rainbow Trout Oncorhynchus Mykiss in the Russian River Watershed written by Kristy L. Deiner and published by . This book was released on 2003 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Distinction of Winter run and Summer run Steelhead in the Hood River Oregon written by Andrew Paul Matala and published by . This book was released on 2005 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Oregon Department of Fish and Wildlife (ODFW) is currently conducting a longterm hatchery supplementation program for summer-run (SR) and winter-run (WR) steelhead trout in the Hood River. ODFW is concerned about the genetic risk to both threatened ecotypes resulting frompotential crossbreeding that may occur within their hatchery supplementation program. A previous draft report by this lab provided evidence for genetic divergence between SR and WR steelhead, and supports the management of these ecotypes as separate populations. In this study, we investigated the feasibility of using genetic data at microsatellite, nuclear DNA loci to identify WR and SR steelhead for broodstock. Adult fish identified as either SR or WR, based on return time to Hood River, and juveniles collected from the east, middle, and west forks of Hood River, were genotyped using a suite of 22 microsatellite loci. A neighbor-joining dendrogram, based on Cavalli-Sforza and Edwards chord distance, showed a SR adult and west fork juvenile steelhead cluster distinct from a second cluster of WR adult, and east and middle fork juvenile steelhead. This topology provides evidence of a genetic basis for separation of ecotypes into the different sub-basins of the Hood River. Because juveniles provide a better representative genetic profile for each ecotype, subsequent data analyses were conducted treating juveniles as the baseline to differentiate SR (west fork) and WR (east, middle forks). The 22 loci examined in this study provided improved discriminatory power for distinguishing SR from WR fish over the set of seven loci examined in our BPA draft report dated 10-23-03. A power analysis showed 92.5% (345 of 374) of the east/middle fork fish, and 84.6% (159 of 188) of the west fork fish in the juvenile baseline had likelihood ratios consistent with their respective groups in a jack-knife baseline analysis. Power of assignment of the SR and WR adults to the juvenile baseline produced results similar to the jackknife power analysis: 89.4% of WR assigned to either the east or middle forks, while 80.9% of SR assigned to the west fork. We determined that the 15 highest ranked loci produce results with assignment stringency comparable to the results from the complete 22 loci set, and that these 15 loci can be used to establish a genetic based rapid-response protocol to aid in the identification of Hood River SR and WR fish to use for broodstock in the long-term hatchery supplementation programs for these two threatened ecotypes."--Summary (page 1).
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 Spatial and Temporal Genetic Structure of Winter run Steelhead Oncorhynchus Mykiss Returning to the Mad River California written by Steven R. Fong and published by . This book was released on 2020 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Distinct populations of steelhead in the wild are in decline. The propagation of steelhead in hatcheries has been used to boost population numbers for recreational fisheries and for use in conservation. However, hatchery breeding practices of steelhead can result in changes in genetic structure. I investigated the genetic structure of winter-run steelhead (Oncorhynchus mykiss) returning to the Mad River, California, where a hatchery has been used enhance production for recreational fisheries since 1971. Genetic variability in Mad River steelhead was evaluated using 96 single nucleotide polymorphisms (SNPs) among 4203 individuals, including the Mad River and nearby locations, and spanning 44 years from 1973 to 2017. I resolved evidence that in the 1970s the Mad River contained both an indigenous population, and a population influenced by the introduction of Eel River winter-run broodstock. Even with the introduction of Eel River broodstock, contemporary Mad River steelhead (1983-2017) appear to be distinct from Eel River collections, as well as other surrounding collections (except Redwood Creek). This distinction is a consequence of the presence of a historically unique population in the Mad River, combined with the inability of the initially introduced Eel River steelhead broodstock to establish itself. Lastly, I found that contemporary Mad River Hatchery broodstock are composed of three groups (or broodlines), defined by adult return year (1) 2009, 2012, and 2015, (2) 2010, 2013, and 2016, and (3) 2011 and 2014. Grouping in 3-year intervals is hypothesized to be a result of the predominant usage of age-3 individuals as broodstock at Mad River Hatchery.
Download or read book Racial Identification of Juvenile Summer and Winter Steelhead and Resident Rainbow Trout Salmo Gairdneri Richardson written by Brian D. Winter 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 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 Genetic Structure of Southern California Coastal Steelhead Oncorhynchus Mykiss Popluations written by Kiera Adams Larbre and published by . This book was released on 2009 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mitochondrial DNA Variation in Steelhead Trout Oncorhynchus Mykiss written by Charles C. Krueger and published by . This book was released on 1999 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mitochondrial DNA variation was analyzed in anadromous steelhead trout collected during the spring spawning season from three streams in Kodiak National Wildlife Refuge. Results were compared to two resident rainbow trout collections from the Kisarilik River.
Download or read book Geographic Distribution of Chromosome and Microsatellite DNA Polymorphisms in Oncorhynchus Mykiss Native to Western Washington written by Carl Olof Ostberg and published by . This book was released on 1997 with total page 104 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 Microsatellite Diversity in California Steelhead Oncorhynchus Mykiss written by Jennifer L. Nielsen 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 Adaptive Naturalization of Steelhead Oncorhynchus Mykiss Populations from Northern Lake Superior Tributaries written by Peter Arthur Addison and published by . This book was released on 2007 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Complementary life-history and genetic diversity (microsatellite DNA loci) were used to assess potential sources of extant phenotypic variation of eight naturalized steelhead populations from northern Lake Superior tributaries. Supplemental stocking subsequent to colonization, which occurred by 1920, has been very limited, thereby providing opportunities for genetic and phenotypic divergence. Populations exhibited high genetic diversity and similar allele size ranges, indicating a highly diverse common ancestor colonized the area. Furthermore, significant hierarchical divergence existed among populations. Five life-history parameters that are used to distinguish between native stocks of steelhead varied significantly among the study populations. Life-history variation was inconsistent with genetic variation and consistent with geographic distance among populations. Assuming that differences among tributary biophysical environments are positively associated with geographic distance these results support the hypothesis that reported life-history variation is the result natural processes (phenotypic plasticity, adaptation, drift and migration) and not contingent upon ancestry.
Download or read book Feeding Aggression and Growth in Juvenile Steelhead Trout Salmo Gairdneri microform written by Abbott, Jeremy C and published by National Library of Canada. This book was released on 1985 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lampreys Biology Conservation and Control written by Margaret F. Docker and published by Springer. This book was released on 2014-11-24 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides the most comprehensive review of lamprey biology since Hardisty and Potter’s five-volume “The Biology of Lampreys” published more than 30 years ago. Published in two volumes, it includes contributions from international lamprey experts, reviewing and providing new insights into the evolution, general biology, and management of lampreys worldwide. This first volume offers up-to-date chapters on the systematics, general biology, conservation status, and conservation needs of lampreys. It will serve as an important reference for researchers working on any aspect of lamprey biology and fishery managers whose mandate is to control or conserve lamprey populations.
Download or read book Genomics in Aquaculture to Better Understand Species Biology and Accelerate Genetic Progress written by José Manuel Yáñez and published by Frontiers Media SA. This book was released on 2016-09-15 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: From a global perspective aquaculture is an activity related to food production with large potential for growth. Considering a continuously growing population, the efficiency and sustainability of this activity will be crucial to meet the needs of protein for human consumption in the near future. However, for continuous enhancement of the culture of both fish and shellfish there are still challenges to overcome, mostly related to the biology of the cultured species and their interaction with (increasingly changing) environmental factors. Examples of these challenges include early sexual maturation, feed meal replacement, immune response to infectious diseases and parasites, and temperature and salinity tolerance. Moreover, it is estimated that less than 10% of the total aquaculture production in the world is based on populations genetically improved by means of artificial selection. Thus, there is considerable room for implementing breeding schemes aimed at improving productive traits having significant economic impact. By far the most economically relevant trait is growth rate, which can be efficiently improved by conventional genetic selection (i.e. based on breeding values of selection candidates). However, there are other important traits that cannot be measured directly on selection candidates, such as resistance against infectious and parasitic agents and carcass quality traits (e.g. fillet yield and meat color). However, these traits can be more efficiently improved using molecular tools to assist breeding programs by means of marker-assisted selection, using a few markers explaining a high proportion of the trait variation, or genomic selection, using thousands of markers to estimate genomic breeding values. The development and implementation of new technologies applied to molecular biology and genomics, such as next-generation sequencing methods and high-throughput genotyping platforms, are allowing the rapid increase of availability of genomic resources in aquaculture species. These resources will provide powerful tools to the research community and will aid in the determination of the genetic factors involved in several biological aspects of aquaculture species. In this regard, it is important to establish discussion in terms of which strategies will be more efficient to solve the primary challenges that are affecting aquaculture systems around the world. The main objective of this Research Topic is to provide a forum to communicate recent research and implementation strategies in the use of genomics in aquaculture species with emphasis on (1) a better understanding of fish and shellfish biological processes having considerable impact on aquaculture systems; and (2) the efficient incorporation of molecular information into breeding programs to accelerate genetic progress of economically relevant traits.
