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During this century livestock production has increased massively through the improved ability to diagnose, treat, control and prevent certain diseases. Despite these advances, disease remains a major constraint to livestock production and welfare throughout the world. In many instances, this is a re...
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The variation in Lepeophtheirus salmonis sea lice numbers across 40 Scottish salmon farm sites during 1996 to 2000 was analysed using mean mobile abundance for 3 important 6 mo periods within the production cycle. Using statistical regression techniques, over 20 management and environmental variable...
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This paper examines two large national data sets collected over several years and contrasts the patterns of sea lice, Lepeophtheirus salmonis (Kroyer, 1837), infections, the use of treatments and the occurrence of chalimus peaks between Norwegian and Scottish farms. Infection levels in Scotland were...
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This article discusses important principles relevant to sampling strategies for monitoring ectoparasitoses in farmed fish. These principles are applied to demonstrate the implications of clustering in sampling practices for sea lice monitoring of farmed Atlantic salmon.
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The Kitasoo/Xai'xais First Nation established a program to monitor sea lice levels on seaward migrating wild juvenile salmon in their traditional territory which contains the most northerly salmon farming region of British Columbia. A total of 12 locations were routinely sampled during the period be...
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This article presents the seasonal and annual patterns of C. elongatus infestation on farmed salmon in Scotland, UK. The effect of management factors and veterinary treatments on infestation and differences in abundance patterns of C. elongatus from Lepeophtheirus salmonis are also described.
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Diagnosis and treatment of endemic infectious disease is crucial for productivity of cattle in rural sub-Saharan Africa, but shortages of trained veterinary professionals necessitate support for less well-trained cadres of animal health worker. A Delphi survey of veterinary experts provided quantita...
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Background: Infestations of the parasitic copepod Lepeophtheirus salmonis, commonly referred to as sea lice, represent a major challenge to commercial salmon aquaculture. Dependence on a limited number of theraputants to control such infestations has led to concerns of reduced sensitivity in some se...
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Analyses of a unique database containing sea lice records over an 11 year period provide evidence of changing infestation patterns in Scotland. The data, collected from more than 50 commercial Atlantic salmon farms, indicate that both species of sea lice commonly found in Scotland, Lepeophtheirus sa...
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Most lice infestations on salmon farmed in the North Atlantic are attributed to Caligus elongatus and Lepeophtheirus salmonis. This study reports findings from time-series analysis conducted on observations of the lesser-studied C. elongatus, in four farms on the west coast of Scotland over the peri...
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In order to investigate whether the efficacy of emamectin benzoate (SLICE) against sea lice (Lepeophtheirus salmonis) infestation in Atlantic salmon had changed in Scotland, UK, in the period since regular application of the drug began, sea lice abundance and treatment data were examined from 56 wes...
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Although Caligus elongatus is one of two major species of sea lice that parasitize farmed salmon, its epidemiology has not been extensively studied. In this communication, the abundances of the adult stage of C. elongatus in salmon populations from 33 farms in the West of Scotland between 1997 and 2...
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Quantitative information was collected through a Delphi survey on the most important clinical signs and risk factors for diagnosis of bovine anaplasmosis, babesiosis, cowdriosis, fasciolosis, parasitic gastroenteritis (PGE), schistosomosis, theileriosis and trypanosomosis, with the aim of compiling ...
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Purpose
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Readers will be aware that the issue of sea lice infection and control is a problem that affects farms in most salmon-producing areas. However, when discussing the problem or its solution with reference to other countries it is important to understand the major differences as well as similarities in...