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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...