THE IMPORTANCE OF FISH IN THE SPREAD OF THE ROMANIAN UNIONIDS.

The spread throughout the whole Dacian basin of the „carved” Romanian unionids has been attributed to the attachment of glochidia (larvae of unionids) to the gills or fins of the fish from the hydrographical network. From the analysis of the parasitosis process with glochidia at current freshwater fish, it results that this is the propagation mechanism of unionids, but it mostly occurs in stagnant waters and to a lesser extend in rivers. [ABSTRACT FROM AUTHOR]