a large mainly freshwater fish related to the sturgeon, with an elongated snout 匙吻鲟,白鲟
The plankton-feeding Polyodon spathula of the Mississippi basin, and the fish-eating Psephurus gladius of the Yangtze River, the only surviving members of the family Polyodontidae 密西西比盆地食浮游生物的匙吻鲟和长江中食鱼的白鲟是匙吻鲟科中的仅存种