Titre du document / Document title
Infection threshold to estimate Lepeophtheirus salmonis-associated mortality among juvenile pink salmon
Auteur(s) / Author(s)
JONES Simon R. M. (1) ;
HARGREAVES N. Brent (1) ;
Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
(1) Pacific Biological Station, Fisheries and Oceans Canada, 3190 Hammond Bay Road, Nanaimo, British Columbia V9T 6N7, CANADA
Résumé / Abstract
A threshold of lethal infection was estimated from previous controlled laboratory exposures to be 7.5 Lepeophtheirus salmonis g
-1 for pink salmon Oncorhynchus gorbuscha averaging <0.7 g. This threshold was used to assess the risk of mortality caused by L. salmonis among pink salmon of the same size class in the Broughton Archipelago, Canada from 2005 to 2008. Virtually all (≥98.9 %) pink salmon collected in late March belonged to this size class, and this proportion declined to ≤1 % by early July. The proportion of these small pink salmon with infections equal to or exceeding the threshold declined from 4.5 in 2005 to 0% in 2008, coincident with an overall decline in parasite prevalence and intensity during this period. In 2005 and 2006, this proportion was greatest in March (7.8 and 1.1%, respectively) whereas in 2007, the proportion exceeding the threshold was greatest in May (2.9%). In 2008, no infections exceeded the threshold. Parasite development coincided with fish migration through the study area. The declining risk between 2005 and 2008 was possibly related to changes in ocean conditions such as temperature, to changing treatment practices for this parasite on salmon farms, or to changes in the abundance or distribution of non-farmed hosts. The concept of a threshold of L. salmonis infection density may be used to assist in the management and conservation of juvenile pink salmon in the Broughton Archipelago region.
Revue / Journal Title
Diseases of aquatic organisms
ISSN
0177-5103
CODEN DAOREO
Source / Source
2009, vol. 84, n
o2, pp. 131-137 [7 page(s) (article)] (3/4 p.)
Langue / Language
Anglais
Editeur / Publisher
Inter-Research, Oldendorf, ALLEMAGNE
(1985)
(Revue)
Mots-clés anglais / English Keywords
Vertebrata ;
Pisces ;
Pathogenic ;
Parasite ;
Invertebrata ;
Arthropoda ;
Crustacea ;
Copepoda ;
Oncorhynchus gorbuscha ;
Wild animal ;
Farming animal ;
Sanitary surveillance ;
Mortality ;
Edible fish ;
Young animal ;
Zoopathogen ;
Ectoparasite ;
Infection ;
Laboratory study ;
Mots-clés français / French Keywords
Vertebrata ;
Pisces ;
Siphonostomatoida ;
Pathogène ;
Parasite ;
Invertebrata ;
Arthropoda ;
Crustacea ;
Copepoda ;
Lepeophtheirus salmonis ;
Oncorhynchus gorbuscha ;
Animal sauvage ;
Animal élevage ;
Surveillance sanitaire ;
Mortalité ;
Poisson comestible ;
Animal jeune ;
Zoopathogène ;
Ectoparasite ;
Infection ;
Etude en laboratoire ;
Mots-clés espagnols / Spanish Keywords
Vertebrata ;
Pisces ;
Patógeno ;
Parásito ;
Invertebrata ;
Arthropoda ;
Crustacea ;
Copepoda ;
Oncorhynchus gorbuscha ;
Animal salvaje ;
Animal cría ;
Vigilancia sanitaria ;
Mortalidad ;
Pescado comestible ;
Animal joven ;
Zoopatógeno ;
Ectoparásito ;
Infección ;
Estudio en laboratorio ;
Mots-clés d'auteur / Author Keywords
Lepeophtheirus salmonis ;
Juvenile pink salmon ;
Infection density ;
Laboratory ;
Surveillance ;
Localisation / Location
INIST-CNRS, Cote INIST : 21304, 35400018607797.0060
Nº notice refdoc (ud4) : 21416445
