The large paddle-fish or spoon-bill (Polyodon spatula) from North American rivers. It can 

 reach a length of 20 to 23 feet. The conical rostrum measures almost a third of the total length. 

 The mouth, like that of the sturgeon, is small, but is provided with teeth. This large fish feeds 

 on small prey detected in the mud by its sensitive rostrum. Photograph by J. G. Sheed. 

 Aquarium Rapho. 



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