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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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Mussel growers in Prince Edward Island (PEI), Canada, currently use high-pressure water spraying (~700 psi) to mortally injure
or dislodge invasive tunicates from mussel product and gear. An added benefit of this process may be the stimulation of byssal
thread production, leading to improv...
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The development of effective mitigation techniques against Botryllus schlosseri and Botrylloides violaceus colonizing blue mussel
aquaculture operations has not been well studied. The objectives of our research were to determine the efficacy of using pressurized seawater
in the mitigation ...
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Mussel (Mytilus edulis) culture in Atlantic Canada utilizes wild seed harvested from spat collection sites. The economics associated with wild-caught seed have proven to be more favourable than with hatchery-produced seed. This is not, however, the case in all areas. In Washington state, seed used f...
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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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The induction of triploidy in Mytilus edulis, using 6-dimethylaminopurine (6-DMAP), was investigated as a potential method of providing high quality sterile product in Prince Edward Island (PEI), Canada. Initial results indicated induction by blocking the second polar body would require a treatment ...
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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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In 1999, examination of soft-shell clam (Mya arenaria) mortalities at an experimental lease on Prince Edward Island (PEI) revealed a 95% prevalence of advanced haemic neoplasia (leukaemia). Low prevalences of this condition had been documented previously in soft-shell clams from Nova Scotia and the ...
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Spatial growth variation of experimentally cultured blue mussels Mytilus edulis in Tracadie Bay, Prince Edward Island, Canada, was consistent in both years of a 2 yr study. The spatial pattern displayed reduced tissue growth along a gradient of decreasing tidal exchange from the inlet mouth to the i...
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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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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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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...
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Due to the challenges of managing invasive species, new technologies to assist in monitoring for the early detection of early life stages of invasive species is critical for many regions of the world. Invasive tunicates have been causing challenges to the shellfish aquaculture industry in Atlantic C...
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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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In Prince Edward Island, Canada, acetic acid treatments that are used to control the clubbed tunicate (Styela clava), a fouling pest on mussel lines, may also affect other epifaunal mussel sock species, including potential tunicate predators. We studied the effect of acetic acid treatment on two pot...
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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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