Results

1551 - 1575 of 1901
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The pathogen Batrachochytrium dendrobatidis (Bd), which causes the skin disease chytridiomycosis, has been linked to amphibian population declines and extinctions worldwide. Bd has been implicated in recent declines of boreal toads, Bufo boreas boreas, in Colorado but populations of boreal toads in ...
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The black soldier fly, Hermetia illucens, has the potential to reduce animal waste on livestock facilities and produce an animal-grade feedstuff high in protein and fat. The lipid content of insects is largely dependent on their diet. Data from this study suggest that black soldier fly prepupae inco...
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In two trials, Arctic char (Salvelinus alpinus) semen was frozen in 0.5 mL straws using extenders consisting of 0.3 M glucose and 10%, 12.5% or 15% methanol. Cryopreserved semen was thawed by immersing straws in 25°C water for 17 s (11.6°C s-1) or in 5°C water for 60 s (3.3°C s-1). The viability...
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A nondestructive, inexpensive diagnostic test for the detection of Kudoa thyrsites infection in the musculature of Atlantic salmon (Salmo salar) was evaluated. The results indicated that the presence or absence of K. thyrsites in the hyohyoideus ventralis muscle of the operculum, as detected in wet-...
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We conducted a processing plant survey to determine the prevalence of cellulitis (enlarged sternal bursa) and focal ulcerative dermatitis (FUD) in Ontario turkeys during the summer and to establish whether the two conditions were associated. A total of 11 772 birds from 24 different farms were obser...
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Batrachochytrium dendrobatidis causes mortality in various amphibian species including the boreal toad Anaxyrus (Bufo) boreas boreas. The purpose of this study was to determine the physiological effects of this pathogen on experimentally infected boreal toads. Plasma osmolality, sodium, and potassiu...
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The objective of this study was to use sentinel fish to determine whether fallowing would effectively reduce the Infectious haematopoietic necrosis (IHN) load around sites in an area where every mariculture site had a history of IHN. The approach involved re-introducing fish to a few strategically p...
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Background: Breast cancer in females and prostate cancer in males are two of the most common cancers in the United States, and the literature suggests that they share similar features. However, it is unknown whether the occurrence of these two cancers at the county level in the United States is corr...
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An epidemiological study of infectious haematopoietic necrosis viral disease (IHN) in farmed Atlantic salmon in British Columbia was conducted to better understand the management of this disease. The study consisted of a descriptive retrospective investigation of 18 IHN outbreaks on farms between 19...
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We conducted a retrospective study to determine the prevalence of cellulitis condemnations in the Ontario chicken industry and the relative proportion of variation attributable to factors that vary between processors, producers, and lots and over time. The time span studied was April 1998 to April 2...
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The performance of flow cytometry (FC) was compared with immunofluorescence microscopy (IM) for detection of Giardia duodenalis in bovine feces. Samples from 36 adult dairy cows and 208 dairy calves were collected. Flow cytometry test characteristics were calculated using continuous, ordinal, and di...
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The prevalence of Kudoa thyrsites was determined for 17 harvests of Atlantic salmon (Salmo salar) from 7 fish farms in British Columbia, Canada. Fish were divided into 2 categories, sexually immature and sexually mature (grilse), using criteria typically employed at processing plants (external morph...
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Atlantic salmon S. salar naturally and experimentally exposed to infectious hematopoietic necrosis virus (IHNV) in British Columbia, Canada, developed antibodies against the virus. More than 50% of the fish exposed to IHNV remained seropositive for several months after the IHN epizootic had subsided...
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Batrachochytrium dendrobatidis (Bd) is a chytrid fungus, which has been associated with numerous amphibian mortality events around the world. It is hypothesized that Bd was inadvertently spread through human activities. We have developed a basic risk assessment tool to better understand the potentia...
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The expansion of aquaculture and the demand for ornamental fishes have resulted in the large-scale movements of aquatic animals and their pathogens. Here, we review the most important non-native fish and shellfish pathogens in European waters and their global impacts on wild fish host populations. T...
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A study was conducted to evaluate how the invasive Asian cyprinid Pseudorasbora parva, a recently introduced fish, caused increased mortality and totally inhibited spawning in an endangered native fish, the European cyprinid Leucaspius delineatus. Laboratory experiments showed that the holding water...
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Prevalence of the pathogen Batrachochytrium dendrobatidis (Bd), implicated in amphibian population declines worldwide, is associated with habitat moisture and temperature, but few studies have varied these factors and measured the response to infection in amphibian hosts. We evaluated how varying hu...
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Waterborne outbreaks caused by Cryptosporidium and Giardia are well documented, while the public health implications for foodborne illness from these parasites have not been adequately considered. Cryptosporidium and Giardia are common in domestic livestock, where young animals can have a high preva...
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The Kitasoo/Xai'xais First Nation established a program to monitor sea lice levels on seaward migrating wild juvenile salmon in their traditional territory which contains the most northerly salmon farming region of British Columbia. A total of 12 locations were routinely sampled during the period be...
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Infestation patterns of the sea louse Lepeophtheirus salmonis from 44 salmon farms in the Hardangerfjord on the south-west coast of Norway over the period 2004 to 2007 were assimilated to create 20-month production cycle profiles for spring and autumn stocked generations. The timing and frequency of...
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This communication briefly reviews some of the factors which have shaped the current protocols for lice counting on salmon farms and points out that the motivation for counting is not always the same. It is also apparent that a number of widely accepted assumptions, such as those relating to presume...
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An observational study was conducted in 63 Canadian dairy farms to evaluate the association of bulk tank milk selenium (Se) concentration (BTSe) with average daily milk yield, milk fat and milk protein, bulk tank somatic cell count (BTSCC), and the probability of being a Staphylococcus aureus-positi...