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First Occurrence of Myxidium Infection in Cultivated Charp Snouted Sparus Puntazzo puntazzo in Croatia

First Occurrence of Myxidium Infection in Cultivated Charp Snouted Sparus Puntazzo puntazzo in Croatia First Occurrence of Myxidium Infection in Cultivated Charp Snouted Sparus Puntazzo puntazzo in Croatia Proceedings ot the Third International Symposium on Aquatic Animal Health 248 1998. Andrew S. Kane, Sarah L. Poynton Baltimore, Maryland, SAD APC Press Third International Symposium on Aquatic Animal Health: Building Partnerships for the 21st Century Baltimore, SAD 30.08.-03.09.1998. charp snouted sparus, Puntazzo puntazzo, Myxidium leei charp snouted sparus, Puntazzo puntazzo, Myxidium leei Although charp snouted sparus (Puntazzo puntazzo) is a native inhabitant to Adriatic Sea along Croatian coast, representing even a part of fishermen's catch, until recently this species has not been cultivated in our fish farms. At a certain fish farm experimental production of charp snouted sparus using imported fry was started during 1997. Two months after introduction of seven weeks old fry into growing cages high mortalities started. At the beginning disease started insidiously, affected fish swam slowly close to the water surface separated from the lot and they were emaciated. Pathoanatomically only slight patchy skin discoloration was observed. By internal examination of recently dead and eutanized moribund fish stomach appeared normal, and was filled by usual amount of ingesta, while immediate proximal anathomical structure of intestine was distended by seromucous transparent content. The intestinal wall was thinner and more translucent then normal. Examination of gut mucosa scrapings by light microscopy (400X) disclosed numerous spores compatible with Myxidium leei as described by Diamant et al. (1994). By histopathological examination of intestines numerous parasitic structures in close association with enterocytes were observed. Studied on high magnification they were compatible with those seen on scrapings and the diagnosis of M. leei was supported. Since this is a first and mainly experimental attempt of charp snouted sparus cultivation in our mariculture the importance of described parasitosis due to extreme losses in fish crop should be thorougly studied.

charp snouted sparus; Puntazzo puntazzo; Myxidium leei

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