engleski

Differences in phytoplankton accumulation between Mediterranean mussel Mytilus galloprovincialis Lamarck, 1819 and European flat oyster Ostrea edulis Linneaus, 1758 after natural exposure to toxic Dinophysis bloom

To better understand the dynamics of diarrheic shellfish poisoning (DSP) contamination in Mali Ston Bay, the most important bivalve aquaculture area in the eastern Adriatic Sea, a field study was carried out to detect differences in phytoplankton cells accumulation in two commercially cultured shellfish species ; the mussel Mytilus galloprovincialis Lamarck, 1819 and the oyster Ostrea edulis Linnaeus, 1758. The study was conducted following a bloom of Dinophysis (Ehrenberg, 1839) at the end of March 2010. Analyses of stomach content showed considerable differences in phytoplankton consumption between two investigated shellfish species. In M. galloprovincialis a higher number of phytoplankton species was found than in O. edulis. The most pronounced differences were induced by different accumulation and retention of toxic Dinophysis (Ehrenberg, 1839) species. The most abundant species in the mussels' stomach content was Dinophysis fortii Pavilard, 1923, as opposed to oysters where D. fortii occurred sporadically and in small numbers. Concentrations of both Dinophysis caudata Saville-Kent, 1881 and Dinophysis rotundata Claparède & Lachmann, 1859 in mussels were very low with percentage contribution ranging from 0-1.0% and 0-1.2%, respectively, in total phytoplankton community, whereas the occurrence of these species in oysters has not been registered at all.

Mytilus galloprovincialis; Ostrea edulis; Dinophysis; Mali Ston Bay

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