engleski

The Most Prevalent Diseases in Cultivated Sea Bas (Dicentrarchus labrax) and Sea Bream (Sparus aurata) in Fish Farms Along the Croatian Coast

Basically, there are two main marine fish species which are cultivated on the Croatian coast; sea bass (Dicentrarchus labrax) and sea bream (Sparus aurata). At the present along the almost 6000 km of Croatian Adriatic coast about 20 more significant fish farms are in production. This prosperous production is in permanent progress and the total amount of produced fish is now about 1700 tons per year. This report derives from sistematic clinical, parasitological, pathoanatomical, histopathological and bacteriological monitoring of cultivated marine fish on larger part of production during last five years. Among pathological conditions recognized on our farms, some specific viruses, bacteria and parasites represent frequently established causative nosologic agents.Viral diseases are represented by lymphocistis (Iridoviridae) and epitelocystis due to rickettia in sea bream but their economical impact is not so large as of those caused by bacteria.The most frequent bacterial problems are in both cultivated species mainly due to Vibrio anguillarum, Pasteurella piscicida and Myxobacteria spp. Although isolated bacteria are somewhat specific pathogens, it has to be emphasized that they are basically in ethiological dependance with technology applied. Parasitological examinations often reveal protozoan parasite Trichodina sp and monogenean gill.flukes, namely Microcotyle sp. in sea bream and Diplectanum sp. in sea bass as well as crustacean parasites Caligus sp. and Lernanthropus sp. in sea bass. The importance of diagnosed parasitic infections is not entirely clear and that topic remains to be studied thorougly in further research.

sea bass; sea bream; diseases; mariculture

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