Results

76 - 100 of 154
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
An in vivo rainbow trout (Oncorhynchus mykiss) branchial xenoma expression model was used to detect the presence of viable microsporidial spores (Loma salmonae) within aquarium-held blue mussels (Mytilus edulis) experimentally exposed to a suspension of semi-purified L. salmonae spores. In two separ...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Sturgeon are an important evolutionary taxa of which little is known regarding their responses to environmental factors. Water temperature strongly influences growth in fish; however, its effect on sturgeon immune responses is unknown. The objective of this study was to assess how 2 different temper...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
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...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
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...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Temperatures above 20 degrees C or below 9 degrees C interrupt the life cycle of the gill intracellular microsporidian parasite L. salmonae prior to sporogony, inhibiting the production of xenomas. This study intended to characterize this life-cycle failure. Juvenile rainbow trout were experimentall...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
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...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
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/...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
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...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
In determining the effective vaccine spore dose of a low-virulence strain of Loma salmonae to limit micro-sporidial gill disease in trout, we found that fish receiving 10(3) to 10(5) killed spores had the best protection against experimental infection, with 85% fewer xenomas in their gills than in t...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Resistance to re-infection of rainbow trout to Loma salmonae, a microsporidian gill parasite has been previously documented and this study examined how rapidly this resistance develops. Naive rainbow trout were inoculated intraperitoneally (IP) with an inactivated spore-based vaccine and were then g...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
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...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
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...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
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...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
The objectives of the research were to compare the efficacy of ProVale yeast beta-glucan (beta-glucan) with that of a previously tested research-grade yeast beta-glucan preparation when administered as an intraperitoneal (IP) injection and to also pilot test the effectiveness of ProVale yeast beta-g...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Two studies were designed to quantify the effect of water temperature and flow rate on the transmission potential of the important salmonid gill pathogen, Loma salmonae. Using survival analysis, increased water temperature and low flow rates were determined as risk factors for the transmission of mi...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
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...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
We used hydrogen peroxide to reproduce gill lesions typical of a broad assemblage of gill diseases encountered in aquaculture, and examined the degree of growth rate depression that it caused. Additionally, we compared growth rates of 60 gill-damaged fish when they were either kept separate from (n=...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Tanks of healthy juvenile rainbow trout (Oncorhynchus mykiss) were exposed to chloramine-T (10 mg/litre; 40 fish) or formalin (200 mg/litre; 40 fish) for 1 h once per week for 4 weeks. The effect of this treatment on the primary stress response was evaluated by measuring circulating cortisol levels ...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
Loma salmonae, a microsporidian parasite of salmonids of the genus Oncorhynchus, is a significant cause of economic loss in pen-reared chinook salmon (O. tschawytscha). Final stages of L. salmonae infections are easily recognized by the xenomas that form in the gills during sporogony. However, early...
[Page generation failure. The bibliography processor requires a browser with Javascript enabled.]
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...