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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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In two variants of Loma salmonae that have specificity for rainbow trout Oncorhynchus mykiss (OA variant) and specificity to brook trout Salvelinus fontinalis (SV variant), the parasitophorous vacuole forms at the onset of sporogony. In the OA variant the merogonial stage is bound by a single plasma...
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Chloramine-T is a widely used prophylactic and therapeutic agent in freshwater aquaculture (mainly against bacterial gill disease). The effects of repeated intermittent exposure of healthy rainbow trout (Oncorhynchus mykiss) fingerlings to sublethal concentrations of chloramine-T (0,5, 10, or 20 mg/...
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The effects of dexamethasone (dex) treatment on infections with the microsporidian parasite, Loma salmonae and the effects of dex on initiation of the adaptive immune response were investigated in rainbow trout, Oncorhynchus mykiss experimentally infected with the parasite. Dex treatment resulted in...
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The early ultrastructural stages of Loma salmonae were studied in the gills of experimentally infected rainbow trout. No parasitic stages were identified during the first 2 wk of the infection. By week 3 postexposure (PE), uninucleate and binucleate meronts were recognized within host cells (no xeno...
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Infection by a microsporidian of the genus Loma was found in gills of cod Gadus morhua. Xenomas contained parasites in multiple stages of development. Some spores looked empty and had everted polar tubes, which were either straight or coiled. These polar tubes were scattered throughout the xenoma cy...
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The sequence of host changes following the rupture of spore-laden xenomas of the microsporidian Loma salmonae during Microsporidial Gill Disease of Salmon was deduced from ultrastructural examination of the gills of naturally infected, moribund, chinook salmon from a commercial aquaculture site. The...
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The presence of dendritic cells in fish is studied with immunohistochemistry using a commercially available antibody developed against Langerin/CD207 present in human Langerhans cells. Langerin/CD207, a protein known to be associated with the development of Birbeck granules in human and murine syste...
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Experiments involving 200 rainbow trout showed that host defence mechanisms in sea lice-infested fish are impaired, predisposing fish to subsequent infections to a second pathogen, such as the microsporidian parasite Loma salmonae. Macrophage impairment in lice-infested fish occurred when sea lice b...
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Whitish, opaque, coalescing masses were observed coating the visceral organs of numerous adult coho salmon when they were dissected for artificial spawning in the autumn of 1983 at the Puntledge River hatchery, British Columbia. One affected fish was observed in November 1991. Histological examinati...
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Healthy gills from fingerling rainbow trout were dissected and fixed using either a conventional 0.1M cacodylate buffered 2.5% glutaraldehyde or the same fixative with 2% (w/v) Alcian blue added. The tissues were processed for light and electron microscopy. Skin tissue samples from cases of necrotic...
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The main objective of this investigation was to examine the ultrastructural features of gills from rainbow trout experimentally infected with Loma salmonae to determine the morphological events that occur during the late stages of development of this parasite. Peripheral distribution of the mature p...
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The purpose of this study was to determine adequate dose ranges and to test for side effects associated with chronic treatment of fish with indomethacin. Rainbow trout Oncorhynchus mykiss were orally treated with indomethacin at various nominal concentrations: a negative control (0 mg/kg) and...
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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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The effect of exposing Atlantic salmon Salmo salar to hydrogen peroxide was investigated to identify the acute and chronic effects of a single high dose on physiological measurements of stress. A total of 120 Atlantic salmon were divided into 3 groups, exposed to either saltwater (control), or 1000 ...
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Juvenile rainbow trout were exposed to therapeutic concentrations of formalin or chloramine-T to assess the effects of these chemicals on the morphology of the piscine epidermis and its mucous coat. Repeated treatment, once weekly for 4 weeks, with either chemical did not affect the mucous coat of t...
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Two variants of Loma salmonae occur in net-pen reared chinook salmon, Oncorhynchus tshawytscha. The typical variant (OA) has a host specificity for salmonids of the genus Oncorhynchus whereas the atypical variant (SV) has a host specificity for brook trout, Salvelinus fontinalis, and in this study, ...
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The presence of dendritic cells in fish is studied with immunohistochemistry using a commercially available antibody developed against Langerin/CD207 present in human Langerhans cells. Langerin/CD207, a protein known to be associated with the development of Birbeck granules in human and murine syste...
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Infection of rainbow smelt Osmerus mordax with the microsporidian Glugea hertwigi was diagnosed for the first time in Prince Edward Island, Canada. The prevalence of infection was 24%, 45 infected out of 187 examined fish captured in February and March 2009. Both large and small xenomas of G. hertwi...
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