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Sequences of nuclear-encoded small-subunit rRNA genes have been determined for representatives of the enigmatic genera Dermocystidium, Ichthyophonus, and Psorospermium, protistan parasites of fish and crustaceans. The small-subunit rRNA genes from these parasites and from the "rosette agent&quo...
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Two cases of Amoeba-like infections in cultured warmwater marine fish are described, a systemic infection in pompano T. falcatus from Singapore and a gill infection in Mediterranean (Greece) sea bream S. auratus. All pompano showed marked systemic infection of Amoeba-like parasites in the gills, kid...
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Lesions found in bay scallops Argopecten irradians imported into Atlantic Canada for culture were attributed to a parasite Perkinsus karlssoni. It appears, however, that stages from several organisms were combined to create the life cycle of P. karlssoni. The ultrastructure of the agent in lesions o...
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Besnoitia sp. was diagnosed in two caribou (Rangifer tarandus caribou) which died of pneumonia at the Assiniboine Park Zoo (Winnipeg, Manitoba, Canada) in 1983. During the following 3 yr besnoitiosis spread to an isolated herd of caribou, to mule deer (Odocoileus hemionus hemionus) and to reindeer (...
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Besnoitia was diagnosed in 2 caribou (Rangifer tarandus caribou) which died of pneumonia at the Assiniboine Park Zoo, Winnipeg, Manitoba, Canada, in 1983. During the following 3 years, besnoitiosis spread to an isolated herd of caribou, to mule deer (Odocoileus hemionus hemionus) and to reindeer (R....
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Chronic mortalities in lumpfish Cyclopterus lumpus reared in a saltwater recirculation system were associated with the presence of an intranuclear microsporidian. Morphological changes were characterized by infiltration of lymphocyte-like cells predominantly in the renal interstitium and also in the...
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The scuticociliate Anophryoides haemophila, causes bumper car disease in American lobster (Homarus americanus) in commercial holding facilities in Atlantic Canada. While the parasite has been recognized since the 1970s and much has been learned about its biology, minimal molecular characterization e...
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The objective of this study was to identify risk factors for productivity losses in the Canadian lobster industry. Lobster handling and fishing practices onboard 64 fishing boats and transportation conditions on 49 vehicles subsequently transporting these lobsters from fishing wharves to processing ...
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The levels of production, ascarid burden and respiratory disease were measured on 15 purposively selected swine herds, and the relationships between the various measures of ascarid burden were examined. On each farm 30 randomly selected pigs were weighed and rectal fecal samples were collected at ap...
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Shell disease is a major threat to the American lobster ( Homarus americanus, Milne Edwards) fishery. Here we describe the composition of microbial communities associated with lesions of 2 forms of shell disease in Atlantic Canada, ( i) a trauma shell disease (TSD) characterized by massive lesions a...
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This case report provides pathologic and confirmatory molecular characterization of an outbreak of bumper car disease caused by the scuticociliate Anophryoides haemophila in American lobster Homarus americanus, from a commercial holding facility in Nova Scotia, Canada. Although sporadically and anec...
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The site of development, survival of larvae, and reaction to the presence of Physaloptera maxillaris [a nematode parasite of the skunk Mephitis mephitis that has arthropod intermediate hosts] are described in Gryllus pennsylvanicus Burm. (Acheta pennsylvanicus) and Blattella germanica (L.) from obse...
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Neoparamoeba pemaquidensis continues to be an ongoing problem for commercial finfish aquaculture and has also sporadically been associated with mass mortalities of commercially relevant marine invertebrates. Despite the ubiquity and importance of this amphizoic amoeba, our understanding of the biolo...
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Hemocytes of the American lobster (Homarus americanus H. Milne Edwards) were classified after examination of Wright-Giemsa stained cytocentrifuge preparations by brightfield light microscopy. Eleven hemocyte types were identified using morphologic criteria. The classification system was then used to...
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A comparison of the coinfection of bay scallops with Perkinsus karlssoni and an as yet unidentified coccidian is described. P. karlssoni occurred in a range of host tissues including mantle, digestive gland, intestine, gill and gonad. Host tissue response elicited against P. karlssoni ranged from fo...
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In North America, one of the largest traditional surviving fisheries involves the coldwater clawed American lobster Homarus americanus. However, post-harvest losses are conservatively estimated at 10-15%, representing an economic impact of $50-75 million annually. The mandate of the Lobster Health R...
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The potential for cross-transmission of Perkinsus karlssoni from bay scallops Argopecten irradians to various native Atlantic Canadian species of shellfish was investigated. Lateral proximal transmission was investigated whereby infected moribund bay scallops were maintained with uninfected individu...
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Developmental stages of Cryptosporidium sp. (Protozoa: Cryptosporiidae) were observed in tracheal epithelium of two groups of turkey poults from a farm in central Saskatchewan. Lesions associated with the parasite included excess mucus, epithelial hyperplasia and metaplasia and necrosis, and macroph...
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Visceral and systemic infection with a Dermocystidium -like organism was diagnosed recently in post-seawater entry smolts of Atlantic salmon farmed in the Bay of Fundy. In late summer and early fall, young fish developed "black smolt" disease, characterized by anorexia, lethargy and black skin. Para...
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The etiological agent of 'bumper car' disease in lobsters Homarus americanus is described as a new species of ciliate, Anophryoides haemophila (Scuticociliatida: Orchitophryidae). A. haemophila n. sp. is distinguished from other species in the genus by the curved rectangular oral polykinetid 2, a so...
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Eimeria bubonis n.sp. and Caryospora bubonis n.sp. both from Bubo virginianus from Saskatchewan, Canada, are described. E. bubonis differs from E. speotytoi and E. strigis in having shorter and narrower sporulated oocysts (22.8 plus or minus 2.7 mu m long and 21.7 plus or minus 2.4 mu m wide) with a...