First record of the Monrovia doctorfish Acanthurus monroviae Steindachner, 1876 (Perciformes: Acanthuridae) in the Adriatic Sea (Croatian waters)

Records of Monrovia doctorfish Acanthurus monroviae in the Croatian part of the Adriatic Sea are reported.The first occurrence of this non-native species was detected by one of the authors and was subsequently publicly reported by citizens via social media.The origin of introduction is unknown, but it is most likely active migration from the Mediterranean through the Strait of Otranto.