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Chinese sturgeon (Acipenser sinensis), captive in aquarium. Adults are no longer able to swim upriver to spawn due to Gezhouba and Three Gorges dams
American paddlefish (Polyodon spathula), an introduced species native to the Mississippi River Basin, USA, swimming over lake bed, private lake, Moscow region, Russia
Adriatic sturgeon (Acipenser naccarii) Parco del Ticino, Biosphere Reserve, Lombardia, Italy. Captive. Critically endangered species
Russian sturgeon (Acipenser gueldenstaedtii), albino, resting on lake bed, private lake, Moscow region, Russia