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Life-span and reproductive capacity of sea lice, Lepeophtheirus salmonis, were investigated in artificial seawater (Instant OceanReg.) under laboratory conditions. Sea lice were maintained on Atlantic salmon (Salmo salar) in recirculation systems for as long as 7 months. During this period sea lice ...
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Experiments were conducted to determine the effects of sea lice, Lepeophtheirus salmonis, on non-specific defence mechanisms in Atlantic salmon, Salmo salar, by experimentally infesting hatchery-reared 1 and 2 year old post-smolts, S1 and S2, with laboratory grown infective copepodids at moderate to...
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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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SUMMARYSome members of the ABC-transporter superfamily, such as P-glycoprotein and the multidrug resistance associated protein, may confer resistance to the avermectin subclass of macrocyclic lactones. The aim of this study was to examine the presence of ABC transporters in both sea lice (Lepeophthe...
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The effects of Lepeophtheirus salmonis, on non-specific defence mechanisms in Salmo salar, were determined by experimentally infesting 180 hatchery-reared post-smolts with laboratory-grown infective copepodids at moderate to high infection intensities ranging from 15 to 285 lice per fish. The effect...
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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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This chapter covers the host range and specificity, morphology, life cycle, physiopathology, parasite-host interactions, role as disease vector and control and prevention (biological control, environmental approach, drug therapy, vaccination and insecticides) of Lepeophtheirus salmonis and Caligus r...
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Overexpression of P-glycoproteins (Pgps) is assumed to be a principal mechanism of resistance of nematodes and arthropods to macrocyclic lactones. Quantitative RT-PCR (Q-RT-PCR) was used to demonstrate changes in transcription levels of two putative P-glycoprotein genes, designated here as SL0525 an...
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The roles of water temperature, flow, and agitation on the development and settlement of sea lice (Lepeophtheirus salmonis) on their Atlantic salmon (Salmo salar) hosts were investigated in the laboratory. In the first phase, fish were exposed to 5, 10, or 15 degree C and increased water-flow (18 L/...
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The roles of water temperature, flow and agitation on the development and settlement of sea lice on their Atlantic salmon hosts were investigated in the laboratory. In the first phase, fish were exposed to 5, 10 or 15 degrees C and increased water-flow (18 vs. 6 litre/min). In the second phase, fish...
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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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