Alien Species in the Association of the Consort Type Cradoscrupocellaria cf. bertholletii (Audouin, 1826) (Candidae, Bryozoa)

In the summer and autumn period of 2024, an association of consort type with the environment-forming species Cradoscrupocellaria cf. bertholletii (Audouin, 1826) (Bryozoa) not typical for the Black Sea was studied on an oyster farm near Sevastopol. Macrophytes were not found in the association. Thirty-eight macrozoobenthos species belonging to Polychaeta, Decapoda, Amphipoda, Bivalvia, Gastropoda, Tanaidacea, and Pantopoda have been recorded. Four species that are invasive to the Black Sea Anadara kagoshimensis (Tokunaga, 1906), Stenothoe cf. tergestina, Caprella cf. equilibra, and Hydroides dianthus (Verrill, 1873) have been discovered. Caprella cf. equilibra was an abundant species; Stenothoe cf. tergestina was the dominant one. Analysis of the sexual structure of the populations showed the predominance of females of Stenothoe cf. tergestina. The ratio of males and females of Caprella cf. equilibra was 1 : 1, which confirms the stable state of the population of this species. The polychaete invaders Hydroides dianthus have been found in colonies of bryozoans attached to the shells of mollusks.