Identification of a non-native Cynoscion species (Perciformes: Sciaenidae) from the Gulf of Cádiz (southwestern Spain) and data on its current status

• Main Authors: Rafael Bañón, Alberto Arias, Diego Arana, Jose A. Cuesta
• Format: Article
• Language: English
• Published: Consejo Superior de Investigaciones Científicas 2017-03-01
• Series: Scientia Marina
• Subjects: biological invasion; marine introduction; weakfish; cynoscion regalis; guadalquivir estuary; taxonomy
• Online Access: http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1696

Cynoscion is a genus of fish in the family Sciaenidae from the Atlantic and Pacific American coasts that is important in recreational and commercial fisheries. Morphological analysis identifies a species inhabiting the Gulf of Cádiz (southern Spain) as the weakfish, Cynoscion regalis, a native of the northwest Atlantic. This finding is also confirmed by molecular identification using 16S and Cox1genes. Based on the examination of a previous manuscript, the assignation of this species to the spotted seatrout, Cynoscion nebulosus, is considered a misidentification. C. regalis has been reported in the area since 2011 and is now considered an established species that is distributed along the Guadalquivir River estuary and is a target of local artisanal fisheries. The pathway of introduction is unknown, but possible mechanisms are considered, of which ballast water seems to be the most plausible. A revision of non-native sciaenids also found in European waters is carried out. The ecological impact of weakfish on the local fish community is still unknown and should be object of future studies.