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In addition to electroreceptors on the rostrum, paddlefish also have sensory pores covering nearly half of the skin surface extending from the rostrum to the top of the head down to the tips of the operculum (gill flaps). Paddlefish with damaged or abbreviated rostrums are still able to forage adequately. [5] [14]
These receptors are morphologically similar to the ampullae of Lorenzini of sharks and rays, and are indeed passive ampullary-type electroreceptors used by American paddlefish to detect plankton. [31] Clusters of electroreceptors also cover the head and operculum flaps. The diet of the American paddlefish consists primarily of zooplankton.
Alex Cord on location (1993) performing the voice-over and on-camera work for The Paddlefish: An American Treasure. Exotic and Unusual Fishes of North America is a series of PBS documentary television specials about three species of American fish: The Alligator Gar: Predator or Prey?, The Paddlefish: An American Treasure, and Sturgeon: Ancient Survivors of the Deep.
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The electroreceptors are thought to be used in various behaviors such as feeding, mating and migration. [ 35 ] Many sturgeons leap completely out of the water, [ 37 ] usually making a loud splash which can be heard half a mile away on the surface and probably farther under water.
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