The persistence of infectivity of Tetracapsulabryosalmonae-infected water for rainbow trout, Oncorhynchus mykiss (Walbaum)

摘要: Proliferative kidney disease (PKD) is caused by the infection of susceptible salmonid fish with spores myxozoan Tetracapsula bryosalmonae ,a parasite harboured and released several species bryozoans. Under natural conditions, PKD a water-borne fish, whose outcome spatio-temporal dissemination depend on viability present in water. In order to evaluate duration infectivity, juvenile rainbow trout, Oncorhynchus mykiss ,w ere exposed for 20 h T. bryosalmonae-infected water at various times post-water collection or after different filtration procedures. When infected was held temperature range 14.5– 17 � C up 14 days, transmitted only between 0 12 its infectivity vanished 24 h. Similarly, passed through 25 lm but not 1 mesh filters, lost material eluted from membrane although parasite’s DNA amplified this material. The parasitic appears be fragile may offer opportunities decrease impact trout farms implementation management procedures aimed reducing number bryozoan-holding surfaces located river, immediately upstream these farms.