Inter-Research > DAO > v91 > n2 > p129-136  
Diseases of Aquatic Organisms

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DAO 91:129-136 (2010)  -  DOI:

High Gyrodactylus salaris infection rate in triploid Atlantic salmon Salmo salar

M. Y. Ozerov1, J. Lumme2, P. Päkk3, P. Rintamäki2, M. S. Ziętara4, Y. Barskaya2, D. Lebedeva2, E. Saadre5, R. Gross3, C. R. Primmer1, A. Vasemägi1,3,*

1Department of Biology, 20014, University of Turku, Finland
2Department of Biology, University of Oulu, 90014 Oulu, Finland
3Department of Aquaculture, Institute of Veterinary Medicine and Animal Science, Estonian University of Life Sciences, 51014 Tartu, Estonia
4Laboratory of Comparative Biochemistry, Biological Station of University of Gdańsk, 80-680 Gdańsk, Poland
5Põlula Fish Rearing Centre, Rägavere vald 46701, Estonia
*Corresponding author. Email:

ABSTRACT: We describe an unusually high infection rate of Gyrodactylus salaris Malmberg in juvenile Atlantic salmon Salmo salar L. of Baltic Sea origin, which are generally believed to be more resistant to G. salaris than East Atlantic salmon populations. Based on analyses of mitochondrial (complete cytochrome oxidase 1 [CO1] gene, 1548 bp) and nuclear (ADNAM1, 435 bp; internal transcribed spacer [ITS] rDNA region, 1232 bp) DNA fragments, the closest relatives of the characterized Estonian G. salaris strain were parasites found off the Swedish west coast and in Raasakka hatchery, Iijoki (Baltic Sea, Finland). Analyses of 14 microsatellite loci of the host S. salar revealed that approximately 40% of studied fish were triploids. We subsequently identified triploid Atlantic salmon of Baltic origin as more susceptible to G. salaris infection than their diploid counterparts, possibly due to compromised complement-dependent immune pathways in triploid salmon. This is in accordance with earlier studies that have shown elevated susceptibility of triploids to various viral or bacterial pathogens, and represents one of the first reports of increased susceptibility of triploid salmonid fish to an ectoparasite. However, further experimental work is needed to determine whether triploid Atlantic salmon is generally more susceptible to G. salaris compared to their diploid counterparts, irrespective of the particular triploidization method and population of origin.

KEY WORDS: Atlantic salmon · Gyrodactylus salaris · Pathogen susceptibility · Triploid · Microsatellites · Baltic Sea

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Cite this article as: Ozerov MY, Lumme J, Päkk P, Rintamäki P and others (2010) High Gyrodactylus salaris infection rate in triploid Atlantic salmon Salmo salar. Dis Aquat Org 91:129-136.

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