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The known geographical distribution of the colonial scleractinian coral Cladocora debilis Milne Edwards & Haime, 1849 has been extended with new record from the eastern Adriatic Sea. This scleractinian coral was found in spring 2002 on the cliff at the south of Lastovo Island (South Adriatic). The new record reported here is the first confirmation of C. debilis presently living in the Adriatic Sea.

Impact of tuna farming on the banks of the coral Cladocora caespitosa in the Adriatic Sea is discussed.

The known geographical distribution of the colonial scleractinian coral Cladocora debilis Milne Edwards & Haime, 1849 has been extended with new record from the eastern Adriatic Sea. This scleractinian coral was found in spring 2002 on the cliff at the south of Lastovo Island (South Adriatic). The new record reported here is the first confirmation of C. debilis presently living in the Adriatic Sea.

Our recent surveys are focused on four locations where banks occur in the Adriatic Sea: in the Lim channel and near Prvić Island in the northern Adriatic ; near Pag Island in the central Adriatic and in Veliko jezero (National Park “ Mljet” ) in the southern Adriatic. In the area where the banks occur the annual sea temperature range is rather wide ; from 6 °C in winter (the Lim channel) to 29 °C in summer (Mljet Island).