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The electroreceptors can detect weak electrical fields which not only signal the presence of prey items in the water column, such as zooplankton which is the primary diet of the American paddlefish, but they can also detect the individual feeding and swimming movements of zooplankton's appendages.
Ampullae of Lorenzini (sg.: ampulla) are electroreceptors, sense organs able to detect electric fields. They form a network of mucus -filled pores in the skin of cartilaginous fish ( sharks , rays , and chimaeras ) and of basal bony fishes such as reedfish , [ 1 ] sturgeon , [ 2 ] and lungfish . [ 1 ]
Several basal bony fishes, including the paddlefish (Polyodon spathula), possess electroreceptors. The paddlefish hunts plankton using thousands of tiny passive electroreceptors located on its extended snout, or rostrum. The paddlefish is able to detect electric fields that oscillate at 0.5–20 Hz, and large groups of plankton generate this ...
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The American paddlefish is native to the Mississippi River basin and once moved freely under the relatively unaltered conditions that existed prior to the early 1900s. It commonly inhabited large, free-flowing rivers, braided channels, backwaters, and oxbow lakes throughout the Mississippi River drainage basin, and adjacent Gulf Coast drainages.
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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.