First record of Marteilia sp. in mussels Mytilus galloprovincialis in Croatia.
Marteiliosis is a disease of molluscs caused by Marteilia refringens in Europe and M. sydneyi in Australia. During routine examination of cultured mussels Mytilus galloprovinciallis in the northern Adriatic, the occurrence of Marteilia sp. was recorded with a prevalence of 5%. This parasite was not detected in flat oysters reared in the same area. The affiliation of the detected parasite in Mytilus galloprovinciallis was confirmed by in situ hybridization using a Marteilia refringens probe, specific at generic level. DNA of infected mussels originating from the same area will be used to clarify the taxonomic position of this species within the genus Marteilia using a molecular approach.