engleski

Health status of rudd (Scardinius erythrophtalmus hesperidicus H.) in lake Vrana on the island of Cres.

Health status of rudd living in the biggest Croatian carstic lake is evaluated. Studies were conducted during a two-year period and comprised of parasitological, haematological and bacteriological surveys. Parasitological examination revealed a light infestation on 27 % of examined fish, mostly with Dactylogyrus and Ichthyophthirius species. Haematological studies showed that haematocrit values were lower than physiological limit. A haematocrit coefficient of correlation was in all research periods higher than 15 %, indicating that majority of fish under study were susceptible to development of bacterial and other diseases. Indeed, a diverse array of bacteria were isolated from rudd, mainly Flavobacterium spp. and Aeromonas spp., but also some specific fish pathogens, notably Pasteurella piscicida, Yersinia ruckeri and Edwardsiella ictaluri. Under stress conditions, detected bacterial species can give rise to disease outbreaks.

health status; rudd

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