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Health status of rudd ( Scardinius erythrophthalmus hesperidicus H.) in Lake Vrana on the Island of Cres, Croatia

Health status of rudd ( Scardinius erythrophthalmus hesperidicus H.) in Lake Vrana on the Island... The health status of rudd (Scardinius erythrophthalmus hesperidicus H.) in Lake Vrana, the largest Croatian karstic lake, was evaluated. Studies comprising parasitological, haematological and bacteriological surveys were conducted over a 2‐year period. Parasitological examination revealed a light infestation of 27% of the examined fish, mostly Dactylogyrus and Ichthyophthirius species. Haematological studies showed that haematocrit values were lower than the physiological limit. A haematocrit coefficient of correlation in all research periods was higher than 15%, indicating that the majority of fish in the study were susceptible to the 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, were identified. Under stress conditions, detected bacterial species can give rise to disease outbreaks. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Ichthyology Wiley

Health status of rudd ( Scardinius erythrophthalmus hesperidicus H.) in Lake Vrana on the Island of Cres, Croatia

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References (8)

Publisher
Wiley
Copyright
Copyright © 2001 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0175-8659
eISSN
1439-0426
DOI
10.1046/j.1439-0426.2001.00236.x
Publisher site
See Article on Publisher Site

Abstract

The health status of rudd (Scardinius erythrophthalmus hesperidicus H.) in Lake Vrana, the largest Croatian karstic lake, was evaluated. Studies comprising parasitological, haematological and bacteriological surveys were conducted over a 2‐year period. Parasitological examination revealed a light infestation of 27% of the examined fish, mostly Dactylogyrus and Ichthyophthirius species. Haematological studies showed that haematocrit values were lower than the physiological limit. A haematocrit coefficient of correlation in all research periods was higher than 15%, indicating that the majority of fish in the study were susceptible to the 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, were identified. Under stress conditions, detected bacterial species can give rise to disease outbreaks.

Journal

Journal of Applied IchthyologyWiley

Published: Feb 14, 2001

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