单词	paddlefish
释义	paddlefish /ˈpad(ə)lfɪʃ / noun (plural same or paddlefishes) A large mainly freshwater fish related to the sturgeon, with an elongated snout. 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. American paddlefish are mainly freshwater fish but can survive in brackish water.... Since sturgeons and paddlefish have lost many traits of most bony fish - they lack scales and have a cartilaginous skeleton - their fossil records are very sparse. Within the Chondrostei, only sturgeons, bichirs and paddlefishes survive today, and many are threatened.
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