engleski

First record of Atractolytocestus huronensis in open waters in Croatia

For more than ten years Laboratory for Aquaculture and Pathology of Aquatic Organisms has been monitoring the River Kupa basin in Croatia. Fish health status is important part of this monitoring and in the year 2014 a total of 80 fishes (10 fishes from each locality) have been checked for health status during which 12 different parasites have been found. Native preparations of gills and skin were made and checked for ectoparasites under the light microscope. After dissection, internal organs were macroscopically examined in order to check the presence of endoparasites. The digestive tract was separated from the other organs and different intestinal parasites were visible inside of the different parts of the intestine. Parasites were placed in 70% or 99% ethyl alcohol. For the determination of morphological properties, the individual intestinal parasites were observed under the light microscope and were determined according to the previous description in the literature. Parasitological examination of fish revealed six types of ectoparasites (Dactylogyrus sp., Gyrodactylus sp., Trichodina sp., Ichthyophthirius multifiliis, Epistylis sp., Diplozoon sp., ) and six types of endoparasites. Regarding endoparasites parasitological examination revealed two from the Acanthocephala phylum - Pomphorhyncus laevis and Acanthocephalus anguillae/Acanthocephalus sp. ; three from Cestoda class - Khawia sinensis, Atractolytocestus huronensis and Triaenophorus nodulosis, and one from Trematoda class. Each kind of endoparasite was characteristic for the fish host: K. sinensis and A. huronensis were found in common carp ; Acanthocephala in chub, bream, prussian carp, brown trout, danubian roach, bleak and schneider ; T. nodulosis in pike and trematodes in pike and loach. Finding of A. huronensis in common carp is the first record in open waters in Croatia. Investigated parasites could due to the great abundance and other stressful moments have an effect on fish health.

Atractolytocestus huronensis; common carp; fish; parasites

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