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High Gyrodactylus salaris infection rate in triploid Atlantic salmon Salmo salar
Tekijät: Ozerov MY, Lumme J, Pakk P, Rintamaki P, Zietara MS, Barskaya Y, Lebedeva D, Saadre E, Gross R, Primmer CR, Vasemagi A
Kustantaja: INTER-RESEARCH
Julkaisuvuosi: 2010
Journal: Diseases of Aquatic Organisms
Tietokannassa oleva lehden nimi: DISEASES OF AQUATIC ORGANISMS
Lehden akronyymi: DIS AQUAT ORGAN
Numero sarjassa: 2
Vuosikerta: 91
Numero: 2
Aloitussivu: 129
Lopetussivu: 136
Sivujen määrä: 8
ISSN: 0177-5103
DOI: https://doi.org/10.3354/dao02242
Verkko-osoite: http://www.int-res.com/abstracts/dao/v91/n2/p129-136/
Tiivistelmä
We describe an unusually high infection rate of Gyrodactylus salaris Malmberg in juvenile Atlantic salmon Sahno 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. salads compared to their diploid counterparts, irrespective of the particular triploidization method and population of origin.
We describe an unusually high infection rate of Gyrodactylus salaris Malmberg in juvenile Atlantic salmon Sahno 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. salads compared to their diploid counterparts, irrespective of the particular triploidization method and population of origin.
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