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The taxonomic composition and dynamics of numerical density of alien tintinnid species in the bays and harbours of the northeastern Black Sea were studied. The highest number of non-indigenous tintinnid species (9 species) were found in the Novorossiysk Harbour, the lowest number of species (4 species) in the Gelendzhik Bay, and two species – in the harbours of Sochi and Sukhum. In the Novorossiysk Harbour, Amphorellopsis acuta Schmidt, 1902 (average density 2.1 ± 1×106 cells/ m3), Dartintinnus alderae Smith, Song, Gavrilova, Kurilov, Liu, McManus and Santoferrara, 2018 (average density 1.34 ± 0.6×106 cells/m3), and Tintinnopsis tocantinensis Kofoid and Campbell, 1929 (average density 0.73 ± 0.31×106 cells/ m3) were dominant during the late summer-autumn season of 2012–2017. The summarized abundance of tintinnid ciliates was almost six to eight times higher than in the late 1990s. This study report Rhizodomus tagatzi Strelkov and Wirketis, 1950 and Tintinnopsis mortensenii Schmidt, 1902 for the first time from the northeastern Black Sea. The origin of alien species populations in the northeastern Black Sea have been linked probably to their introduction by shipping.

Invasive alien species of tintinnid ciliates from the northeastern Black Sea, Russian and Abkhazian coast