Siberian and Russian sturgeon natal origin in South America: Fish farm or established population?

AVIGLIANO, ESTEBAN; LEISEN, MATHIEU; DUQUENOY, CAMILLE; LIOTTA, JORGE; VOLPEDO, ALEJANDRA

AUSTRAL ECOLOGY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2023 p. 1 - 11

1442-9985

Sturgeon (Acipenser baerii and A. gueldenstaedtii) specimens, native to thenorthern hemisphere, were reported in different environments of the La PlataBasin (South America). The objectives of this study were to provide the firstinsights into the natal origin and habitat use of these sturgeon species in theLa Plata Basin through geochemical analysis (87Sr/86Sr) of fin spines and to reviewhistorical catch reports. Spine core-to-edge87Sr/86Sr ratios were measuredby LA-MC-ICPMS.A Quadratic Discriminant Analysis model based on water87Sr/86Sr baseline of the La Plata Basin was run to infer the natal origin. The isotopicprofiles indicate a common origin, compatible with the location of the fishfarms in the Uruguay Basin. The A. baerii isotopic time series suggested that thefish moved towards the Paraná Basin months before capture, while A. gueldenstaedtiiwould have survived a longer time (perhaps years). Seventeen reportsof sturgeons were recorded and preserved in museum collections between 1998and 2020. Sturgeons were collected from Río de la Plata Estuary, Paraná andUruguay basins and Atlantic coastal lagoons. It is recommended to closely monitorsturgeon catches, paying special attention to the appearance of specimensof reproductive age, in order to generate management and management plansif necessary.