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The effects of the following six treatments against Loma salmonae, a microsporidian gill pathogen, were examined in rainbow trout: fumagillin (high dose), pyrimethamine + sulphaquinoxaline, albendazole, amprolium, fumagillin (low dose), and metronidazole. The fish were infected by mouth and the trea...
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Chinook salmon Oncorhynchus tshawytscha were experimentally infected per os with Loma salmonae and held in flow-through seawater tanks at 12 to 14 degrees C. The fish exhibited 100% infection when first examined at 7 wk post initial exposure (p.e.), and by 20 wk p.e. they had completely recovered fr...
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Four trials were performed to evaluate the effects of water temperature on critical aspects of L. salmonae development in rainbow trout (Oncorhynchus mykiss). The permissive water temperature range in which xenomas developed was between 9 degrees C and 20 degrees C. Parasite development was arrested...
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Few microsporidia have been reported from whitefish species (subfamily Coregoninae). For the most part, these microsporidia have been incompletely described. In a survey of parasites of mountain whitefish Prosopium williamsoni collected from Kootenay Lake, British Columbia, we encountered an unusual...
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The effects of formalin and chloramine-T on oxygen consumption of juvenile brook trout (Salvelinus fontinalis) at low water temperature (2 degrees C) were studied with a flow-through respirometer. No changes were found in the oxygen consumption of these fish after exposure to formalin at 200 and 400...
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Piscine nodaviruses (Betanodaviridae) are frequently reported from a variety of cultured and wild finfishes. These non-enveloped, single-stranded RNA virions cause viral encephalopathy and retinopathy (VER), also known as viral nervous necrosis (VNN) or fish encephalitis. Recently, nodavirus infecti...
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Loma salmonae OA- and SV-strains were isolated from Oncorhynchus kisutch after passage of infective gill material through rainbow trout Oncorhynchus mykiss and brook trout Salvelinus fontinalis, respectively. In infection Trial I, six groups of thirty-five 10-g fish were isolated into 70-litre fibre...
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Loma salmonae is a common gill parasite of salmonids, and essentially all species in the genus Oncorhynchus are susceptible. Infections occur in both fresh and salt water. Loma salmonae is directly transmissible by ingestion of spores or infected tissue. The parasite infects the wall of blood vessel...
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This paper describes the gross findings, histopathology, and ultrastructural and scanning electron microscopical (SEM) appearance of farmed Norwegian Atlantic salmon dying from a disease known locally as 'acute heart failure'. Pathological findings were mainly cardiac, and some fish showed haemoperi...
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A series of challenge and re-challenge studies was conducted in which juvenile rainbow trout were exposed to L. salmonae to determine if a primary exposure, conducted at a water temperature outside of the range which permits the parasite to undergo sporogony and form branchial xenomas, would stimula...
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The oxygen consumption of 3 species of pleuronectids, the yellowtail flounder, Pleuronectes ferruginea, the winter flounder, P. americanus, and the American plaice, Hippoglossoides platessoides, were studied under simulated, land-based aquaculture conditions. Routine oxygen consumption (ROC) rates f...
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Two groups of Arctic char (Salvelinus alpinus) and one of rainbow trout (Oncorhynchus mykiss) from a commercial fish farm in eastern Canada were found to have mixed infection of the gills with Flavobacterium branchiophilum (the causative agent of bacterial gill disease (BGD) and amoebae similar to t...
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The therapeutic effect of dietary treatment with monensin was examined in 70 rainbow trout experimentally infected with 200 000 spores of L. salmonae. 35 fish were then a commercial diet containing ionophore monensin (10 g of monensin per kg of diet) and the remaining fish were fed the same diet wit...
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The neural pathology associated with spontaneous cases of bacterial kidney disease (BKD), in five species of commercially reared salmonids, was investigated histopathologically and with immunofluorescence. Patterns of localisation of the causative organism of BKD within the central nervous system su...
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Piscine nodaviruses are frequently being reported from a variety of cultured and wild finfish. These pathogens are responsible for viral encephalopathy and retinopathy (VER), also known as viral nervous necrosis (VNN) or fish encephalitis. Recently, nodavirus infections have posed serious problems f...
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Piscirickettsia salmonis, the etiologic agent of salmonid rickettsial septicemia (SRS), or piscirickettsiosis, causes substantial economic losses to the salmon industry. The pathogenesis of the disease has not been fully characterized. The aim of this study is to describe the hepatic lesions associa...
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Two groups of healthy chinook salmon (Oncorhynchus tshawytscha) were experimentally exposed to gas supersaturated groundwater. Gross lesions consistent with gas bubble disease (GBD) developed. Vascular lesions associated with intravascular gas bubbles were examined with light and scanning electron m...
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Twice-weekly treatment of juvenile rainbow trout with hydrogen peroxide at 200 mg/litre for 1 h was effective in limiting the degree of fin and epithelial damage associated with an experimental thermally promoted outbreak of columnaris disease attributable to Flexibacter columnaris [Cytophaga column...
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We reviewed the clinical presentations and histopathology of 118 diagnostic submissions of trout with infectious gill diseases from commercial trout farms within Ontario. Bacterial gill disease (BGD) (56%) and nodular gill disease (NGD) (26.2%) together accounted for 82.2% of these submissions. Subm...
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Project Loma is a multidisciplinary collaborative research programme aimed to develop the treatment and control of the microsporidian parasite Loma salmonae which is the cause of Microsporidial Gill Disease of Salmon (MGDS). Recent studies have shown that the principal host target, salmonids within ...