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The ability of a parasite to transmit from one fish to another is important in the dissemination of disease. Groups of 25 naive rainbow trout (RBT), O. mykiss, were exposed to L. salmonae by feeding on the viscera (gills, hearts and spleens) from L. salmonae-infected donor RBT (DRBT) or by cohabitat...
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Transmission studies were conducted to determine if Loma salmonae was transmissible in sea water. Transmission of L. salmonae to chinook salmon (Oncorhynchus tshawytscha) held in sea water was achieved by exposing fish to macerated, infected gill tissue. Fish were exposed in seawater in a flow-throu...
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Previous studies have modelled the relationship between water temperature and the rate of sporulation as defined by xenoma formation during microsporidial gill disease (MGD) in salmon caused by Loma salmonae. Although offering insight into the epidemiology of MGD, a key unexplored area is the role o...
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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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Based on current commercial aquaculture production practices, the production cycle for Atlantic salmon (Salmo salar) extends over a 36-month period during which time the fish are first exposed to intensive freshwater rearing conditions followed by transportation to marine netpen sites for ongrowing....
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An isolate from naturally infected Atlantic salmon was determined to be Rhodococcus-like based on its biochemical profile and from gas liquid chromatography assessment of its cellular fatty acid methyl esterase profile. This isolate was used in an infectivity trial in which Atlantic salmon juveniles...
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Loma salmonae infections of salmonids culminate in the development of branchial xenomas and subsequent focal hyperplasia of the lamellar or filament epithelium following xenoma rupture and spore release. The effects of this acute branchial disruption upon net ionic flux rates and plasma electrolyte ...
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The oxygen consumption rates of three species of pleuronectids, the yellowtail flounder, Pleuronectes ferrugineus (Storer), the winter flounder, Pleuronectes americanus (Walbaum), and the American plaice, Hippoglossoides platessoides (Fabricius), were examined under simulated, land-based, aquacultur...
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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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Treatment of two sizes of juvenile Atlantic salmon (Salmo salar) (16.0 cm initial fork length) with formalin at either 167 or 250 micro l/litre every 2 weeks for a 12-week period from mid March to the end of May before transfer to seawater had no significant effect on their growth survival, plasma e...
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The objectives of the study were (1) to determine an acceptable dose of dietary monensin against microsporidial gill disease (MGD) of salmon caused by Loma salmonae and (2) to determine the life stage of L. salmonae at which the action of monensin was most effective at reducing clinical disease. Rai...
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A large group of 40 gram Coho salmon smolts experienced 60% mortality within the first week after introduction to cages in sea-water. Histological and ultrastructural examination of sequential samples of gill tissue revealed a dramatic suppurative branchitis accompanied by extensive fusion of gill l...
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Using gill tissue from chinook salmon (Oncorhynchus tshawytscha) that contained mature xenomas laden with Loma salmonae spores, the infection was successfully transmitted to rainbow trout (O. mykiss). The infection developed in an identical manner and over a similar time course in trout as in chinoo...
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Host species and salinity often affect the development of disease in aquatic species. Eighty chinook salmon Oncorhynchus tshawytscha, 80 coho salmon O. kisutch and 80 rainbow trout O. mykiss were infected with Loma salmonae. Forty of each species were reared in seawater and 40 in freshwater. The mea...
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The range of branchial lesions associated with bacterial gill disease (BGD) in rainbow trout, Oncorhynchus mykiss, was investigated through the ultrastructural examination of 23 separate outbreaks of the disease condition within commercially reared stocks. Diseased branchial tissues had a large and ...
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The sequential pattern of bacterial colonization and the sequential development of branchial lesions during typical outbreaks of bacterial gill disease (BGD) was studied among 4 groups of commercially reared rainbow trout fingerlings, Oncorhynchus mykiss. During a 5-month monitoring regime, before t...
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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. ...
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Chloramine-T is a commonly used drug for the treating bacterial gill and skin diseases in the intensive aquaculture of salmonids; however, little is known about its effects on healthy fish. Juvenile rainbow trout were exposed weekly to 5, 10, and 20 mg/litre active chloramine-T ingredient in a tank ...
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The induction of protection against xenoma development by vaccinated (previously exposed to a low-virulence strain of Loma salmonae; n=40) and naive (n=40) rainbow trout (Oncorhynchus mykiss) challenged with the virulent typical strain of L. salmonae, was determined. Prevalence of infection was lowe...