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The aetiology of haemic neoplasia (HN) is unknown, so far but many causative factors are suggested such as viral, pollution and genetics. The aim of this study was to determine if, under chronic exposure, two major pesticides (chlorothalonil and mancozeb) which are used in potato production could in...
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A project initiated in October, 2000 at the Atlantic Veterinary College and Pacific Biological Station (PBS) assessed the health/disease issues relevant to the culture of indigenous shellfish species. This project included a thorough geographic survey of infections affecting the Stimpson's bar clam ...
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Triploid shellfish are sterile and retain product quality during, and after the spawning period. Field evaluations of diploid and triploid mussels demonstrated that triploids had a greater growth rate than diploids. The growth difference was evident in the first growing year after deployment in a hi...
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With the increasing spread of invasive marine species and their detrimental effects on aquaculture operations globally, mitigation strategies need to be optimized to mitigate economic impacts. The efficacy of a potassium monopersulphonate triple salt based disinfectant used in the aquaculture indust...
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Over the past decade, four exotic tunicates (Styela clava, Ciona intestinalis, Botrylloides violaceus and Botryllus schlosseri) have been reported in the Brudenell estuary in Prince Edward Island (PEI), Canada. Styela clava was the first exotic tunicate to arrive in 1997, rapidly establishing, sprea...
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Four hundred eighty mature marine mussels (Mytilus edulis) were collected in late April from a mussel lease in an estuary in Prince Edward Island, Canada. Squash preparations made of reproductive gland (mantle) tissue of each mussel were stained with Wright-Giemsa stain and were examined by one inve...
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Since all retroviruses possess reverse transcriptase (RT) enzyme, reverse transcriptase activity has been the main supportive evidence of retroviral etiology of haemic neoplasia (HN) in soft shell clams, Mya arenaria. The objective of the present study was to search for a putative retrovirus in vari...
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This report describes the first 4 years of an experimental rotation in ecosystem health offered to senior veterinary students in Canada. Faculty from the 4 Canadian veterinary colleges collaborated in offering the rotation once annually at one of the colleges. The first rotation was held in Guelph, ...
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A colorimetric method (glucose oxidase/peroxidase) for indirect measurement of glycogen concentrations in tissue homogenates of marine mussels (Mytilus edulis) was evaluated. This method uses a conversion of glycogen to glucose by amyloglucosidase. Varying the buffer pH (4.5, 5.0; 5.5) and the amylo...
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A colorimetric method for indirect measurement of glycogen concentrations in tissue homogenates of eastern oysters (Crassostrea virginica) was evaluated. This method uses a conversion of glycogen to glucose by amyloglucosidase. The procedure was optimized Fur extracting buffer pH (5.0) and amylogluc...
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The first confirmed report of the invasive solitary ascidian Styela clava (clubbed tunicate) in the blue mussel (Mytilus edulis)
production area of March Water in Malpeque Bay, Prince Edward Island (PEI), occurred in September of 2002. Mussel farms in
eastern PEI waters have been challenge...
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Invasive species such as ascidians have negative effects on aquaculture operations worldwide. Prince Edward Island, Canada, in particular has seen high fouling levels of non-native tunicates including the colonials Botryllus schlosseri and Botrylloides violaceus. Previous research indicated that hig...
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Diagnosis of haemic neoplasia (HN) in the soft shell clam, Mya arenaria, is often achieved by hematocytology and histology. Since neoplastic cells display tetraploid DNA contents, haemocyte cell cycle analysis was developed for use as a diagnosis tool. The aim of this study was to assess the applica...
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The zoonotic protozoan parasites Cryptosporidium parvum, and Giardia duodenalis can colonize the gastrointestinal tracts of many farmed, domestic and wild animals, and are capable of causing disease in humans. Due to their high prevalence in dairy and beef cattle, farms are considered to be potentia...
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We describe 4 years of an experimental rotation in ecosystem health offered to senior veterinary students in Canada. Faculty from the 4 Canadian veterinary colleges collaborated in offering the rotation once annually at 1 of the colleges. The 1st rotation was held in Guelph in 1993, followed in succ...
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There are currently four invasive tunicate species which are causing significant challenges to the aquaculture industry in Atlantic Canada: Ciona intestinalis, Styela clava, Botryllus schlosseri and Botrylloides violaceus. Molecular PCR based assays have been developed in previous studies as high th...