Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 96 for “"oysters"”.
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A population dynamic model assessing options for managing eastern oysters (Crassostrea virginica) and triploid Suminoe oysters (Crassostrea ariakensis) in Chesapeake Bay
… although it required a much larger number of oysters to be stocked. Decreasing disease-mediated mortality rates by 20% in high density populations and by 80% in low density populations reduced the probability of extirpation to zero, suggesting the degree of genetic improvement needed to …
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Control of Vibrio vulnificus and Vibrio parahaemolyticus in oysters
… are naturally found in seawater and oysters. Every summer, the oyster industry is threatened by recall of oysters due to V. vulnificus and V. parahaemolyticus contamination. Destroying these human pathogens in shell stock oysters will reduce the economic loss due to recalls and …
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Sensory and Chemical Characteristics of Eastern Oysters(Crassostrea virginica)
Eastern Oysters, or Crassostrea virginica, are an important dietary component in the Chesapeake region and have supported a major fishery in the Chesapeake for more than 100 years. Virginia oysters do not always receive attention in up-scale markets. It is possible that the lack of information on …
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Seasonal gonadal changes of adult oviparous oysters in Tomales Bay
<p>Two species of oviparous oysters, Crassostrea virginica (Gmelin, 1790), the Eastern oyster, and Crassostrea gigas (Thunbert, 1793), the Japanese oyster, were introduced into Tomales Bay, California, for commercial purposes. Because these oysters do not propagate in Tomales Bay, new shipments of …
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Growth and survival of Clostridium botulinum type E in pasteurized oysters
… by Clostridium botulinum type E in pasteurized oysters was evaluated. Thermal death time studies for type E spores in a oyster homogenate showed that the spores survived pasteurization at 550 C; D-values ranged from 65 to 100 min at 700 C and 880 to 1300 min at 550 C. When tubes of oyster …
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A Resource Management Analysis of Olympia and Pacific Oysters in Puget Sound
… California Gold Rush, populations of Olympia oysters (<em>Ostrea lurida</em>) were nearly decimated by overharvest and water pollution in Puget Sound. To fill the market demand for oysters, Pacific oysters (<em>Crassostrea gigas</em>) were introduced from Japan in the early 1900s. Since then, …
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Application of Alternative Technologies to Eliminate <i>Vibrios </i> spp. in Raw Oysters
… TX2103) in pure culture and in inoculated live oysters. <i>Vibrio</i> pure culture and inoculated oysters were exposed to pressures of 207 MPa (30 kpsi) to 552 MPa (80 kpsi) for 0 min to maximum of 20 min. More than 5.4 log reductions of <i>V. vulnificus</i> occurred at 345 MPa for 0 min in …
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Understanding immune priming in Pacific oysters: A multi-omics exploration of transcriptomic, epigenetic and microbiome regulation
… molluscs, widespread mass-mortalities of Pacific oysters (Magallana gigas) have occurred in recent years linked to infection with the bacterial pathogen Vibrio aestuarianus. Disease in farmed oysters is difficult to prevent or to treat and, in this context, immune priming has been proposed as a …
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Understanding immune priming in Pacific oysters: A multi-omics exploration of transcriptomic, epigenetic and microbiome regulation
… molluscs, widespread mass-mortalities of Pacific oysters (Magallana gigas) have occurred in recent years linked to infection with the bacterial pathogen Vibrio aestuarianus. Disease in farmed oysters is difficult to prevent or to treat and, in this context, immune priming has been proposed as a …
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An Evaluation of the Role of Temperature on the Safety and Quality of Raw Shellstock Oysters and Bluefish
… liquor. The olfactory acceptability of the raw oysters was evaluated in concert with the microbial and chemical evaluations. At all storage conditions, halophilic bacteria outgrew V. vulnificus by a minimum of 1 log CFU/g oyster (Colony Forming Units per gram) (p < 0.05). Olfactory acceptability …
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Survival of Vibro vulnificus and other Vibrios in raw oysters (Crassostrea virginica) during processing in Virginia and cold storage
… specifically V. vulnificus were affected in oysters by the processing methods employed in Virginia. This study was conducted between July and September in 1995 and during the month of August of 1996 when water temperature was expected to be high. Oysters were harvested from Virginia and the …
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Temporal and Spatial Assessment of PAHs in Water, Sediment, and Oysters as a Result of the Deepwater Horizon Oil Spill
… near Pointe aux Pines, MS. Water, sediment, and oysters were extracted for quantitation of 24 PAHs by gas chromatography mass spectrometry (GC/MS). The concentration range for total PAHs (tPAH) in water was non-detectable to 1100 ng/L and non-detectable to 7450 ng/g for sediment. The highest …
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Survival of Vibrio vulnificus and Escherichia coli in artificially and naturally infected oyster (Crassostrea virginica) tissues during storage in spray- and immersion-type live holding systems
… project was to examine the effects of storing oysters in a spray and an immersion systems on the survival of Escherichia coli and Vibrio vulnificus within the oysters. The effects of physiological stress imposed on oysters, as a result of interstate shipping, were examined by monitoring the …
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The Effects of E-Beam Irradiation, Microwave Energy and High Hydrostatic Pressure on Presence and Health Significance of Cryptosporidium parvum in Eastern Oysters (Crassostrea virginica)
… health concern. Shellfish, including Eastern oysters (Crassostrea virginica) in Chesapeake Bay and other Atlantic coastal waters, have been identified as a potential source of Cryptosporidium parvum infection for humans. The inactivation of C. parvum and other pathogens in raw molluscan …
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History and status of oyster exploitation and culture in South Africa, and the role of oysters as vectors for marine alien species
In South Africa, both wild and cultivated oysters are consumed. Edible wild oysters include Striostrea margaritacea, Saccostrea cucullata, Ostrea atherstonei and 0. algoensis and all occur along the South and East coasts. These oysters were, or are, exploited commercially, recreationally and via …
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CHARACTERIZATION OF OYSTER-ASSOCIATED BIOGEOCHEMICAL PROCESSES IN OYSTER RESTORATION AND AQUACULTURE
… populations. Sustainability efforts to increase oysters in the Chesapeake Bay are of particular interest because oysters provide ecosystem services that may be applied as best management practices (BMPs) to reduce nitrogen inputs, which are the primary cause of eutrophication and its …
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Development of safe and ready to eat frozen oyster products using microwave steam-venting technology
… health risk associated with the consumption of oysters, particularly for at-risk populations. Oysters are filter feeders. They tend to concentrate microbes present in surrounding waters, some of which can cause severe illness in susceptible humans. Among pathogens that contaminate the …
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Rhythms, feeding and respiration of the oyster Crassostrea gigas
… or active phase decreased with temperature. Oysters collected from subtidal sites, as opposed to intertidal sites, also exhibited endogenous rhythms when held under constant condition. Oysters that received no food during a starvation trial were also rhythmic. Oysters subjected to artificial …
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Understanding and minimizing the impacts of host-pathogen-environment interactions in the Pacific oyster Crassostrea gigas
Globally, Pacific oysters Crassostrea gigas are experiencing significant mortalities especially in warmer summer months, as a result of a complex aetiology and a strong association with pathogens such as ostreid herpes virus-1 microVar (OsHV-1 µvar) and bacteria Vibrio aestuarianus. Such …
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Investigating the Response of the Eastern Oyster (Crassostrea virginica) to Low Dissolved Oxygen Conditions
… this thesis investigated 1) the response of oysters to microxic, hypoxic, and normoxic conditions 2) the response of oysters to combined hypoxia and low salinity conditions, and 3) the response curve of oysters at various DO concentrations (0.5mg/L, 1mg/L, 2mg/L, 3mg/L, 4mg/L, and 7mg/L) …
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