Download or read book The Potential for Eutrophication Mitigation from Aquaculture of the Native Oyster Crassostrea Virginica in Chesapeake Bay written by Colleen Beth Higgins and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Native oysters have been promoted as a means to improve water quality in Chesapeake Bay. This project added important insights into the potential of oyster aquaculture to process and remove nutrients from Bay waters. Results clarified that nutrient removal of nitrogen (N), phosphorous (P), and carbon (C) through harvest of cultivated oyster biomass can be quantified and modeled with high levels of statistical confidence. A simple, yet accurate, method is now available for estimating the amount of nutrients removed via harvesting aquacultured oysters. Based on model estimates, 106 harvest sized oysters (76 mm TL) remove 132 kg TN, 19 kg TP, and 3,823 kg TC. Previous work suggested that potentially substantial quantities of N may be removed through enhancement of the coupled nitrification-denitrification pathway in sediments as a result of oyster biodeposition. Using 15N and N2/Ar methods to measure N2 production in sediments, encompassing direct denitrification (DNF), coupled nitrification- denitrification, and anaerobic ammonium oxidation (anammox) pathways, at two oyster aquaculture sites and two reference sites (no aquaculture), we found that oyster biodeposition did not accelerate sediment N removal. We estimate sediment N removal rates via N2 production at an oyster cultivation site producing 5 x 105 oysters (1750 m2) to range from 0.49-12.60 kg N yr-1, compared to 2.27-16.72 kg N yr-1 at a reference site of the same area; making the contribution of oyster cultivation to N removal via sediment N2 production inconsequential as a policy initiative for Chesapeake Bay eutrophication mitigation. Molecular approaches and direct abundance measures have improved our understanding of the sediment microbial community response to oyster biodeposition. Overall, sediments impacted by oyster biodeposition had a significantly different denitrifying community composition than sediments a few meters away or at the non-aquaculture reference sites. Bacterial abundance in sediments was determined by site rather than by oyster biodeposition. No apparent effects of oyster biodeposition were evident in nitrifying bacterial abundance patterns at either site, indicating that oyster biodeposition does not enhance coupled nitrification-denitrification by increasing the abundance of nitrifiers in sediments.
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 Efforts to introduce non native oyster species to the Chesapeake Bay and the National Research Council s report titled Non Native Oysters in the Chesapeake Bay written by United States. Congress. House. Committee on Resources. Subcommittee on Fisheries Conservation, Wildlife, and Oceans and published by . This book was released on 2004 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 Chesapeake Bay oyster restoration management research written by United States. Congress. House. Committee on Resources. Subcommittee on Fisheries Conservation, Wildlife, and Oceans and published by . This book was released on 2002 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Regulation of Environmental Science written by David E. Smith and published by . This book was released on 1993 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The native Chesapeake Bay oyster stocks and harvest are at their lowest level in history, and the Virginia oyster industry is being threatened with economic extinction. A number of factors have contributed to this decline, but the three most often cited are: overfishing; environmental degradation, such as diminished water quality and habitat loss; and oyster disease. Concern over the ecologic and economic impact of this decline has led some Virginia scientists to look for other oyster species which may in the long term be used as a substitute species for "Crassostrea virginica". The introduction of an exotic species of oyster into the Chesapeake Bay has social, economic, ecological and political ramifications. In early spring of 1990 the Virginia Institute of Marine Science (VIMS) of the College of William and Mary submitted a proposal to the Virginia Marine Resources Commission requesting permission to conduct an open water experiment using the Japanese oyster, "Crassostrea gigas", in the York River, one of the tidal rivers of the Chesapeake Bay. The controversy surrounding this proposal and its approval and denial described here, has involved representatives from several state governments, various components of the Chesapeake Bay oyster industry, non-​governmental organizations and public interest groups"--National Sea Grant Library publication website.
Download or read book Environmental and Ecological Benefits and Impacts of Oyster Aquaculture Chesapeake Bay Virginia USA written by M. Lisa Kellogg and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: To better quantify the ecological benefits and impacts of oyster aquaculture, we sampled water quality, sediment quality, benthic macrofaunal communities and oysters at four oyster aquaculture sites located on the western shore of Chesapeake Bay in Virginia, USA. At each site, we collected samples from within the footprint of the aquaculture cages and from nearby areas with similar physical and environmental conditions but far enough away to be minimally influenced by aquaculture operations. Data collected from the water column included chlorophyll concentrations, turbidity, pH, dissolved oxygen concentrations, light attenuation, particle concentration, median particle size, total suspended solids and their organic content, and dissolved nutrient concentrations. Sediment and macrofauna community data collected included sediment grain size and organic content and macrofauna identity, abundance, biomass and species richness. In addition to assessing the potential impacts of oyster aquaculture on the water column and benthos, we also assessed differences in the oysters harvested Environmental and ecological benefits and impacts of oyster aquaculture at each site and estimated the total amount of nitrogen and phosphorus harvested at each site. Differences in water quality, sediment quality, and macrofauna community structure between areas within and outside the farm footprint were rare and of small magnitude and varying direction (i.e. negative versus positive impact) when they did occur. Aquaculture sites varied by an order of magnitude in size, annual harvest and harvest per unit area. They also varied by an order of magnitude in the total amount of nitrogen (N) and phosphorus (P) harvested per unit area. In contrast to the negative environmental impacts associated with other forms of animal protein production for human consumption, oyster harvest from aquaculture sites studied here resulted in the removal of 21-372 lbs. of N and 3-49lbs of P per farm per year.
Download or read book Alternative Substrates as a Native Oyster Crassostrea Virginica Reef Restoration Strategy in Chesapeake Bay written by Russell Paul Burke and published by . This book was released on 2010 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Tale of Two Oysters written by and published by . This book was released on 2006 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Ecological Function of Mariculture written by Jinghui Fang and published by Frontiers Media SA. This book was released on 2022-12-05 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The National Estuarine Eutrophication Project written by and published by . This book was released on 1991 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kuuromykk in k siaakkoset written by and published by . This book was released on 1927 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Cost effectiveness Analysis of Crassostrea Virginica Restoration as a Possible Nutrient Reducing Method Within Chesapeake Bay A Study of the Great Wicomico River Virginia written by Amanda Ann Wenczel and published by . This book was released on 2007 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Chesapeake Bay is currently on the verge of an ecological crisis. Most of the Bay and tributary waters are considered impaired, flora and fauna populations are at all time lows, and there does not appear to be a significant solution in the near future. Over the years, there have been a number of attempts at improving water quality, most notably through wastewater treatment upgrades and changes in agricultural practices. Although these programs have been in place for years, there has been little effect, leading to the increased demand for new initiatives in this field. Additionally, all time low population levels have been recorded for Crassostrea virginica (the eastern oyster), a culturally, economically, and ecologically significant species for the Bay-region. Based on the need to increase both water quality and oyster populations, researchers have proposed a new initiative: the use of oysters' natural ability of filtration to reduce local levels of nutrients. Thus far, research related to this innovative idea has focused on filtration rates and the survivability of restored oyster populations. This thesis attempts to expand upon the current research by conducting a cost-effectiveness analysis on the costs associated with an oyster restoration project in the Great Wicomico River, Virginia as they relate to the amount of nutrients removed by the restored population. The goal of this analysis is to provide a comparison between the unit cost of removing one pound of a nutrient through oyster filtration versus that of the current or proposed alternatives. Based on the preliminary analysis and a Monte Carlo Sensitivity Analysis to account for variability, it was found that oyster restoration projects are not cost-effective solutions to reducing nutrients within Chesapeake Bay. The current alternatives can remove one pound of nitrogen at a cost of between $1.57/lb and $8.56/lb, while according to the Monte Carlo analysis, the oyster restoration project would cost roughly $77.77/lb of nitrogen removed. The results are similar in proportion with phosphorus removal. Overall, this thesis found that oyster filtration is not a cost-effective solution to removing nutrients from Chesapeake Bay, with the recommendation that current alternatives continue until a less-costly method is devised.
Download or read book Biology of Oysters written by Brian Leicester Bayne and published by Academic Press. This book was released on 2017-05-12 with total page 862 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biology of Oysters offers scientific insights into the structure and function of oysters. Written by an expert in the field of shellfish research, this book presents more than 50 years of empirical research literature. It provides an understanding of the edible oysters, in order to equip students and researchers with the background needed to undertake further investigations on this model marine invertebrate. - Presents empirical research findings in context with the relevant theory and its expression in computer models - Includes information on studies of other bivalve species such as mussels and clams - Offers a description of the whole organism to provide a frame of reference for further research - Includes research developments in the phylogeny, physiology and ecology of oysters
Download or read book Non native Oysters in the Chesapeake Bay written by National Research Council (U.S.). Committee on Non-native Oysters in the Chesapeake Bay and published by . This book was released on 2003 with total page 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:
