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A skin disease of intensively reared rainbow trout in Ontario, Canada, known to the farmers as 'no-mucus skin disease' , is reported for the first time. It is characterized by erosive and ulcerative lesions found mainly on the flanks of fingerlings which results in exposure of the tips of the scales...
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An immunofluorescent antibody test (IFAT) developed for the diagnosis for plasmacytoid leukemia was evaluated against histology under field conditions. Previously published results from a laboratory evaluation indicated that the IFAT had a much higher sensitivity than did histology. One hundred seve...
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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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A new species of trichosomoidid nematode, Huffinanela canadensis n. sp., is described from the skin of rockfish (Sebastes spp.) from the Pacific Ocean off the coast of Vancouver Island (Clayoquot Sound region), British Columbia, Canada, on the basis of the morphology of the adult worms and their egg...
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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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Studies on the microanatomy of the mucus-rich biofilm surface of normal or damaged teleost skin tissue have been limited because conventional fixation regimes do not effectively retain mucus during tissue preparation. A non-aqueous fixation method, based on a technique devised to retain airway mucou...
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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 ...
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This study compared and contrasted the fate of the microsporidian Loma salmonae, a branchial pathogen of salmonids of the genus Oncorhynchus, upon exposure of (1) naive susceptible rainbow trout (RT) O. mykiss, (2) naive RT passively immunized with sera from RT previously exposed to L. salmonae, (3)...
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In the spring of 1988 more than 30% of 13 000 market weight rainbow trout died on a trout farm in southwestern Ontario. The fish showed signs typical of oxygen deprivation with listlessness, crowding of water inlets and gasping at the water surface. Water temperature, pH and oxygen levels were norma...
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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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Fungal infection in fry from several families of Atlantic salmon Salmo salar are reported. Moribund fry had a conspicuous cranial defect that corresponded with 18.3% mortality. The lesion was characterized by a domed, epithelium-covered swelling centered over the optic tectum. The swelling was an oe...
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Outbreaks of columnaris diseases occurred on 2 trout farms in July 1988. Only a small percentage of fish was affected on each farm. On one farm affected fish had areas of destruction of the ventral body wall leading to herniation of internal organs. On the second farm lesions resembled those of furu...
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Two trials were conducted to assess the effects of repeated prophylactic formalin treatments on the gill structure of salmonids. In trial 1, which involved Atlantic salmon, approaching smoltification in a commercial facility, fish were treated with either 167 or 250 mg/litre formalin for 90 min ever...
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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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Following a per os challenge of naive rainbow trout with live spores of Loma salmonae, head kidney mononuclear cells (MNC) in culture were able to proliferate in response to crude soluble parasite extract or intact dead spores. A significant response was seen by week 2 post-exposure and a maximum re...
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Epidemic mortalities of chinook salmon alevins (Oncorhynchus tshawytscha) have occurred annually at a freshwater hatchery at the Chehalis River, British Columbia, Canada, since 1982. Previous work has identified branchial epithelial hyperplasia as the predominant pathological change. Our initial wor...
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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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Plasmacytoid leukaemia (PL) is a lymphoproliferative disorder that affects netpen-reared chinook salmon in British Columbia, Canada. The only diagnostic test for PL is histological evaluation of suspect fish. Monoclonal antibodies (MAbs) previously reported to react with tissues of PL-affected fish ...
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This report is the first morphological description of cells that resemble dendritic cells, which appear to form resident populations within the spleen and anterior kidney of fish. Based on examination of three salmonid species, including, rainbow trout, brook trout, and Atlantic salmon, the cells we...
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We studied the morphology and occurrence of splenic Langerhans-like (LL) cells in species representing 11 orders of ray-finned fishes, Actinopterygii. LL cells were frequent in spleen tissue of species among Cypriniformes, Esociformes, Salmoniformes, and Pleuronectiformes. These cells contained gran...
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Juvenile rainbow trout Oncorhynchus mykiss suffering from a mixed gill infection caused by Flavobacterium branchiophilum and Ichthyobodo necatrix [Ichthyobodo necator] were treated with a daily 1-h formalin [formaldehyde] (0.167 mL/L) or chloramine-T (10mg/L) bath on each of three consecutive days. ...