Download or read book Investigation of an Iodine Isotopic Effect in the Pacific Oyster Crassostrea Gigas and Eggs of Steelhead Trout Salmo Gairdneri written by Larry Deane Tornberg and published by . This book was released on 1979 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research in Fisheries written by University of Washington. College of Fisheries and published by . This book was released on 1979 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Investigation Into the Effect of Triploidy on the Filtration Rate of the Pacific Oyster Crassostrea Gigas Thunberg written by S. Freeman 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 Summer Mortality of Pacific Oyster Crassostrea Gigas written by Jean-François Samain and published by Editions Quae. This book was released on 2008-02-13 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mass oyster mortalities have been known for many years throughout the world, but no strictly pathological explication has been found. This book describes how environmental influences, reproduction, stress, genetics, pathogens and temperature contribute to oyster summer mortality in France. An interaction model is derived from the results and recommendations are made for forecasting and managing risk factors.

Download or read book The Behaviour of the Pacific Oyster Crassostrea Gigas in Polluted and Unpolluted Environments written by Wilfredo A. Almarzah G. and published by . This book was released on 1992 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Insights from Stable Isotope Dynamics Into the Sensitivity of Larval Pacific Oysters to Ocean Acidification written by Elizabeth Lev Brunner and published by . This book was released on 2013 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: Larvae of the Pacific Oyster, Crassostrea gigas, at Whiskey Creek Shellfish Hatchery (WCH) in Netarts Bay, Oregon, are negatively impacted by high-CO2 water and exposure during the initial shell formation period appears to be particularly damaging. To investigate the mechanism of this early susceptibility, several cohorts of larvae at WCH were monitored for stable isotope incorporation and biochemical composition: one in May 2011 and two in August 2011. The observations presented here focus on the isotopic shifts associated with initiation and rate of feeding, and the catabolism of C-rich (lipid) and N-rich (protein) pools. Persistent ontological patterns in bulk composition among the cohorts suggest that the creation of the initial shell is energetically expensive, and that the major energetic source during this period is maternally-derived egg lipids. The May cohort did not isotopically reflect their food source as rapidly as the August cohorts, indicating slower feeding, higher metabolic demand or lower maternal energy investments. All cohorts turned over organic carbon faster than organic nitrogen. Shell carbon isotopes of all cohorts show a decreasing dependence on ambient dissolved inorganic carbon (DIC) carbon with time and subtle differences in this trend between the May and August cohorts are explored. Patterns in shell [delta]13C suggest greater exposure to ambient conditions during initial shell development, which could be an important process linking ambient carbonate chemistry and larval susceptibility. Scanning electron microscopy (SEM) images are used to document the initial shell formation. Kinetic isotope fractionation, dissolved organic matter (DOM) utilization, and the dissolvability of shell microstructures are also briefly considered in the context of larval susceptibility.

Download or read book The Effects of Temperature on Metamorphosis of the Pacific Oyster Crassostrea Gigas written by Kevin J. Bright and published by . This book was released on 1986 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ocean Acidification Influences on Physiology and Epigenetics in the Pacific Oyster Crassostrea Gigas written by Yaamini Ranjani Venkataraman and published by . This book was released on 2021 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: As ocean acidification continues to impact marine ecosystems at unprecedented rates, phenotypicplasticity may allow organisms to withstand more stressful conditions. Genomic methods can elucidate molecular mechanisms that contribute to phenotypic plasticity, allowing for a deeper understanding of how physiological processes will be impacted by low pH. My dissertation examines the effects of ocean acidification on the Pacific oyster (Crassostrea gigas) stress response and reproduction; elucidate how exposure history impacts phenotype; and explore the role of functional role DNA methylation in somatic and reproductive tissue. I investigated the effect of regional environmental variation on the molecular physiology of C. gigas outplanted at five different estuarine sites (four in Puget Sound, one in Willapa Bay) in Washington, USA using gel-free proteomic methods. While there was no difference in survival, or any protein abundances due to pH differences between sites, C. gigas outplanted at the site with the highest temperature had significantly higher abundances of antioxidant enzymes and molecular chaperones, elucidating the molecular underpinnings of thermotolerance. In a hatchery setting, I explored the impact of ocean acidification on reproductive maturity and output. A seven week low pH exposure did not affect sex ratio or maturation stage; however, it did significantly affect survival of larvae. Even though adult oysters spent four months in ambient pH conditions between low pH exposure and strip spawning, larvae from females that experienced low pH conditions had significantly higher mortality. Finally, I conducted the first investigations examining the effect of ocean acidification in C. gigas methylomes. To investigate the role of environmentally-responsive methylation in reproductive tissue, I analyzed gonad methylomes of female C. gigas exposed to low pH. A total of 1,599 differentially methylated loci (DML) were found in gene bodies. The genic DML were associated with cilium movement, development, and cytoskeletal processes, implying a need to regulate cellular growth in the gonad in response to low pH. I then explored the influence of low pH on the somatic tissue methylome using diploid and triploid oyster ctenidia. Differences in ploidy status yielded 154 DML. These ploidy-DML were associated with cell-cell adhesion and dephosphorlylation processes, which are not commonly associated with methylome changes in organisms that undergo natural polyploidization. The 178 pH-DML were associated with processes commonly observed in oysters exposed to ocean acidification, including apoptosis, protein ubiquitination, zinc ion binding, and cytoskeletal processes. In both reproductive and somatic tissue, the enrichment of DML in genes with multiple transcripts could indicate a role for methylation to regulate gene expression via alternative splicing. Investigating the molecular underpinnings of responses to ocean acidification in C. gigas will provide a thorough understanding of this global aquaculture product’s ability to withstand future ocean conditions.

Download or read book The Effects of Temperature and Salinity on Meiosis Fertilization and First Mitosis of the Pacific Oyster Crassostrea Gigas Eggs written by Jenn-Kan Lu and published by . This book was released on 1986 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measured Effects of the Pacific Oyster Crassostrea Gigas on Water Quality for the Design of a Holding System written by Marcin Whitman and published by . This book was released on 1989 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of X and Gamma Irradiation on the Juvenile Pacific Oyster Crassostrea Gigas written by Steve Ray Trenholm and published by . This book was released on 1977 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two separate studies were conducted during this research project. Oysters were irradiated with 500 and 1000 rads and 5, 10, 20, 50, 75, 100, 150, and 200 krads in the first study in order to determine the effects of ionizing radiation on survival and growth rates. Two periods of high mortality were noted; the first occurred from 2 to 7 days postirradiation in oysters receiving 75 to 200 krads and was associated with an "acute lethal tissue degenerative syndrome." The second mortality period occurred from 40 to 60 days postirradiation in oysters exposed to 10 krads or more and was caused by a "lethal tissue degenerative syndrome." The LD-50 dose was found to be a complex function of time from the moment of irradiation until approximately 80 days postirradiation. The 238-day LD-50 value was 16.5 krads. The mean wet weight of oysters exposed to 20 krads was significantly less than that of the controls from 167 to 238 days postirradiation. Analysis of the results suggest a dose dependent wet-weight relationship in the 5 and 10-krad oysters; they did not weigh significantly less than the controls. Although not statistically significant, the mean wet weights of oysters exposed to 500 and 1000 rads exceeded that of the controls from 43 to 238 days postirradiation. In the second study, oysters were irradiated with 200 R, 600 R, 1000 R, 5 kR (X irradiation), and 8, 16, and 40 krads (gamma irradiation). The purposes of the second study were to analyze histopathologically, the degenerative syndromes and subsequent tissue repair processes in the stomach, gut, collecting ducts, and digestive tubules. Degenerative changes were seen only in the digestive tubules of 5- and 8-kR oysters while in oysters exposed to 16 and 40 krads, degenerative changes coincided with the lethal tissue degenerative syndrome noted in the survival-wet weight study. A tissue regeneration sequence was observed in the stomach, gut, collecting ducts, and digestive tubules of most oysters exposed to 16 krads and in a smaller number of oysters exposed to 40 krads. Tissue regeneration was first observed in the digestive tubules and subsequently in the stomach, gut, and collecting ducts. Repopulation of the digestive tubules involved reepithelialization of the tubule with large, undifferentiated crypt cells followed by their differentiation into secretory and absorptive cells. Tissue recovery in the stomach, gut, and collecting ducts was initiated by islands of small basophilic cells not previously described in these tissues. Rapid mitotic proliferation of these cells and their subsequent differentiation into basal epithelial cells, resulted in the reepithelialization and eventual recovery of these tissues.

Download or read book Effects of Ionizing Radiation and Temperature on the Larvae of the Pacific Oyster Crassostrea Gigas written by Victor Avery Nelson and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fatty Acids in the Eggs and Sac Fry of Steelhead Trout Salmo Gairdneri written by Lyle Wayne Hayes and published by . This book was released on 1971 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Histopathological Effects of Ionizing Radiation on the Pacific Oyster Crassostrea Gigas written by Michael Cary Mix and published by . This book was released on 1970 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Influence of the Trophic Environment and Metabolism on the Dynamics of Stable Isotopes in the Pacific Oyster Crassostrea Gigas written by Antoine Marie Emmery and published by . This book was released on 2013 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Ionizing Radiation and Temperature on the Larvae of the Pacific Oyster Crassostrea Gigas written by and published by . This book was released on 1971 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Ionizing Radition and Temperature on the Larvae of the Pacific Oyster Crassostrea Gigas written by Victor Avery Nelson and published by . This book was released on 1972 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: