Download or read book Eastern Oyster Crassostrea Virginica Growth and Epifaunal Community Development on Bars of Varying Oyster Density in Chesapeake Bay written by Charles Stewart Harris and published by . This book was released on 2003 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Growth of Eastern Oyster Crassostrea Virginica in Chesapeake Bay written by Jessica Marie Coakley and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Eastern Oyster written by Victor S. Kennedy and published by University of Maryland Sea Grant Publications. This book was released on 1996 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1966 Congress passed the National Sea Grant College Program Act to promote marine research, education, and extension services in institutions along the nation's ocean and Great Lakes coasts. In Maryland a Sea Grant Program -- a partnership among federal and state governments, universities, and industries -- began in 1977, and in 1982 the University of Maryland was named the nation's seventeenth Sea Grant College. The Maryland Sea Grant College focuses its efforts on the Chesapeake Bay, with emphasis on the marine concerns of fisheries, seafood technology, and environmental quality. The first comprehensive review of the biology of the eastern oyster in more than thirty years. The twenty-one chapters synthesize every aspect of oyster biology -- for instance, general anatomy, physiology, the circulatory system, reproduction, genetics, diseases -- and issues related to management and aquaculture.
Download or read book Development of a Habitat Suitability Index for the Eastern Oyster Crassostrea Virginica in Great Wicomico River Virginia written by Seth Joseph Theuerkauf and published by . This book was released on 2012 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: The eastern oyster, Crassostrea virginica, provides critical ecological functions to Chesapeake Bay. Unfortunately, as a result of overharvesting, disease, and poor water quality, the native oyster population of the Bay currently stands at less than 1% of its historic size. Within the Great Wicomico River, a tributary of the Bay, the United States Army Corps of Engineers (USACE) Norfolk District has successfully restored approximately 85 acres of "no take" sanctuary oyster reef. This study developed a habitat suitability index (HSI) for the eastern oyster in the Great Wicomico River in order to identify areas of suitable oyster habitat. The model was validated using live adult oyster density data derived from the 2011 VIMS monitoring survey of the USACE restored reefs. The results from this model can be used to inform the rehabilitation of the existing sanctuary oyster reef network and the construction of additional oyster reef in the Great Wicomico River.
Download or read book Nonnative Oysters in the Chesapeake Bay written by National Research Council and published by National Academies Press. This book was released on 2004-03-09 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonnative Oysters in the Chesapeake Bay discusses the proposed plan to offset the dramatic decline in the bay's native oysters by introducing disease-resistant reproductive Suminoe oysters from Asia. It suggests this move should be delayed until more is known about the environmental risks, even though carefully regulated cultivation of sterile Asian oysters in contained areas could help the local industry and researchers. It is also noted that even though these oysters eat the excess algae caused by pollution, it could take decades before there are enough of them to improve water quality.
Download or read book Diseases Parasites of the Eastern Oyster Crassostrea Virginica in Chesapeake Bay written by Chris Dungan and published by . This book was released on 2020-11 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication supports the development of oyster aquaculture industries and restored populations of wild oysters in the eastern United States. Both aquaculture and efforts to restore the eastern oyster, Crassostrea virginica, have expanded in recent years, increasing the need for a broader understanding of oyster health. This volume addresses that need by providing detailed information on the histological presentation of diseases and parasites affecting eastern oysters.
Download or read book Geospatial Analysis of Eastern Oyster Habitat and Disease in the Chesapeake Bay written by and published by . This book was released on 2018 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: Crassostrea virginica, common name eastern oyster, in the Chesapeake Bay is currently at 1% of its peak annual landings in 1884 (600,000 metric tons). This decline is in spite of being considered a resilient species. Causes of the decline include overharvesting, disease, and habitat loss. While efforts have been made to combat each cause, the key element to recovering the population is coordinated habitat restoration. This study aims to develop a GIS-based habitat model for the eastern oyster in the Chesapeake Bay. The first goal of this study was to determine the water quality parameters necessary for successful oyster population restoration and to locate where those conditions exist concurrently. To identify these areas that are most suitable for restoration efforts, a habitat analysis was performed using GIS data of water quality parameters in the bay consisting of water temperature, salinity, dissolved oxygen, pH, and bathymetry. Data obtained from monitoring stations throughout the bay were used to estimate the water quality parameters. Those parameters were interpolated using inverse distance weighting to create continuous rasters of seasonal averages for each parameter. Then rasters were combined and analyzed using geospatial processing to determine the areas that contain the most favorable conditions for oyster growth at both larval and adult life stages. Additionally, the conditions for proliferation of oyster diseases MSX and Dermo were assessed geospatially. The second goal of this study was to determine the potential changes to suitable oyster habitat area and Dermo proliferation following the climate change experts' prediction of a 2°C water temperature increase. Resulting models showed a decrease in total area of high quality habitat for larval and adult models with the 2°C increase, as compared to the current condition models. Disease proliferation of Dermo also exhibited increases in higher risk areas in the 2°C increase model when compared to the current condition model.
Download or read book The Ecology of Intertidal Oyster Reefs of the South Atlantic Coast written by Leonard M. Bahr and published by . This book was released on 1981 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Growth and Mortality of the Eastern Oyster Crassostrea Virginica in the Patuxent River written by Amy Corker Freise and published by . This book was released on 1996 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Biology Ecology and Ecosystem Contributions of the Eastern Oyster Crassostrea Virginica from Natural and Artificial Habitats in Tampa Bay Florida written by Michael Drexler and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this project was to document the status of oysters, Crassostrea virginica, from non-reef habitats throughout Tampa Bay, Florida, and assess the ecosystem contributions of those populations relative to reef-dwelling oysters. The aspects of oyster ecology studied here include condition, prevalence and intensity of disease (Perkinsus marinus - dermo), reproductive activity (including stage, fecundity, and juvenile recruitment), adult oyster density, and the faunal community associated with the oysters. The predominant source of variation was seasonal, with lesser contributions among sites, and in most cases, little or no effect of the habitat type. Oysters populations from each habitat recruit juvenile oysters, produce mature individuals, and contribute viable gametes at the same magnitude with similar seasonality. The associated faunal communities were also largely similar between habitats at any given site. Measures of oyster density, combined with estimates of the total available habitat, suggest that natural oyster reefs may represent only a small portion of the total oyster community in Tampa Bay, while oysters associated with mangrove habitats and seawalls are probably the most abundant in the bay. Additional mapping and quantification of these habitats would help to define their bay-wide ecosystem-services value. Restoration projects, though small in size relative to other habitats, do provide alternative and additional habitat with comparable value to other oyster-bearing habitats.
Download or read book POPULATION GENETICS OF EASTERN OYSTER Crassostrea Virginica RESTORATION IN THE CHESPEAKE BAY written by and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The strategic release of captive-bred organisms is one of the most popular methods to restore species, but concerns exist regarding genetic impacts on natural populations over the long-term. Slow recovery of depleted eastern oyster C. virginica populations in the Chesapeake Bay prompted a large-scale hatchery-based restoration program consisting of the mass-release of hatchery-produced juveniles from local, wild broodstock. This dissertation characterized the genetic impact of this program, with the overall goal of understanding how characteristics of species life-history interact with hatchery practices to shape genetic variation in populations over short and long-time scales. In Chapter 2, analysis of genetic diversity changes resulting from hatchery production under two spawning designs (mass- and controlled-spawns) revealed substantial reductions in diversity and the number of breeders from parents to offspring, due primarily to high variance in reproductive success among adults in hatchery culture. In Chapter 3, high-resolution genomic data was used in a population genetic analysis comparing diversity of restored reefs in Harris Creek with variable planting histories and husbandry practices to 'wild' Chesapeake Bay oyster reefs. While restored reefs showed similar levels of diversity as wild reefs, strong positive relationships between planting frequency or broodstock numbers and genetic diversity were found, suggesting that hatchery practices can significantly impact diversity in natural populations. These genomic data also permitted the investigation of local adaptation and genotype by environment associations which revealed that salinity was correlated with loci putatively under selection, suggesting potential fitness tradeoffs for sourcing non-local broodstock. In Chapter 4, an individual-based model was created using biological and demographic data from Chesapeake Bay oysters to simultaneously evaluate the impact of multiple hatchery practices on natural p
Download or read book Development Growth and Environmental Adaptations in Two Genetically Distinct Populations of the Eastern Oyster Crassostrea Virginica GMELIN written by Mirella Concepcion Martinez-Bucciantini and published by . This book was released on 1995 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Habitat Suitability Index for the Eastern Oyster Crassostrea Virginica in the Chesapeake Bay written by Timothy Adams Battista and published by . This book was released on 1999 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Stock Assessment of the Eastern Oyster Crassostrea Virginica in the Maryland Water of Chesapeake Bay written by and published by . This book was released on 2018 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Eastern Oyster Crassostrea Virginica written by Denise Cormier Méthé and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the early 1990s, the introduction of suspended culture methods and the development of a market for cocktail oysters (65-75 mm) propelled the oyster aquaculture industry in New Brunswick forward, now producing over 140,000,000 oysters (337,000 floating bags) on 2,649 hectares of private shellfish leases. Recently, the industry has been threatened by an oyster disease outbreak, known as MSX in the Bras D'Or Lakes region (Nova Scotia). The possibility of the MSX parasite spreading into New Brunswick waters, as well as an increasing number of aquatic invasive species in the area, is a real concern for the industry and has prompted an investigation on possible mitigation strategies. The benefits of incorporating an upriver site into the production cycle of oyster aquaculture operations were evaluated. Seed (~ 26 mm shell height) and adult (~ 66 mm shell height) oysters were taken from downriver (salinity ~ 20-30‰) aquaculture sites and transferred upriver (salinity ~ 5-20‰) and monitored for shell and meat growth (May-October). At the same time, the impact of the relay fishery (harvest of oyster in closed marginally contaminated areas for relay to tenures in open areas) on oyster productivity was evaluated; wild upriver oysters were transferred downriver and monitored. Productivity data revealed that seed transferred upriver grew and survived as well as seed that remained downriver, while the mortality rates of adult oysters were lower at the upriver site. Meat content was unaffected in adult oysters transferred upriver. However, adult oysters transferred upriver had a gain in shell height (least squares means ± standard error) over the oysters that remained downriver (2.7 ± 0.5 mm vs. 1.8 ± 0.5 mm) and, in shell width (Median [95% CI]; 2.8 mm [1.9, 3.6] vs. 1.0 mm [0.3, 1.2]). Final organic meat content were approximately 35% less in adult oysters transferred downriver compared to those that remained upriver, confirming anecdotal reports from fishers of the relay fishery. Stress response of adult oysters was also assessed (80 and 150 days post transfer). Stress response measured revealed that regardless of their origin (upriver, downriver), oysters maintained upriver showed high levels of lysosomal destabilization and tissue atrophy. By contrast, the transfer downriver had the opposite effect, i.e. low lysosomal destabilization and low tubule atrophy. Results suggest that there exists no association between productivity parameters and the level of stress response measured by the biomarkers. The field investigation prompted further exploration on the impact of hemolymph fluid osmolality on neutral red retention assay (NRA) outcome. The prescribed saline solution for the assay assumes animals are isosmotic to surrounding water; however oysters sampled were hyperosmotic. Hemolymph osmolality was manipulated under laboratory conditions by subjecting adult oysters to temperature (0, 5, 10, 15, 20oC) and salinity (6, 27‰) regimes. At 10-20oC, oysters remained isosmotic to ambient waters, while hyperosmotic at 0-5oC. When mimicking spring freshets (salinity 6‰), hyperosmotic condition was observed in all temperature groups, and was inversely proportional to temperature. Monitoring of valve activity confirmed a restricted exchange at 6‰ salinity (e.g. spring freshet). With these laboratory results, use of filtered hemolymph fluid (NRAMOD) is recommended instead of the prescribed standard solution (standard NRA) adjusted to ambient seawater.
Download or read book A Study of Competition Between Native Eastern Oyster crassostrea Virginica and Nonnative Suminoe Oyster crassostrea Ariakensis and Implications for the Chesapeake Bay written by Katherine Frances Holt and published by . This book was released on 2013 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Reduction and Analysis Data from the James River Operation Oyster Spat written by D. W. Pritchard and published by . This book was released on 1953 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
