Susceptibility and resistance of minnows, Phoxinus phoxinus (L.) to Gyrodactylus salaris Malmberg, 1957 (Monogenea) under laboratory conditions
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Abstract
The host susceptibility and resistance of minnows, Phoxinus phoxinus, to Gyrodactylus salaris was examined under laboratory conditions. The following experiments were carried out: transmission rate was examined by exposure of uninfected minnows to infected living or dead salmon; «homing response» was examined using «two-choice» host tests; and G. salaris survival on minnows was, examined using individual fish isolation or grouped fish isolation. The results of the experiments demonstrated low transference rates to minnows; the transmission rates to salmon were much higher. The parasite was not observed to reproduce on the minnows. The maximum duration of infection after isolation of minnows, individually or grouped, was two and four days, respectively. Minnows are not considered to represent any risk for G. salaris reproduction or dissemination.
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