A TED usually is composed of a grid of bars with an opening positioned at either end of a trawl net. Shrimp and small fish pass through the bars, but larger animals like marine turtles and sharks hit the bars and are ejected through the opening.
The National Oceanic and Atmospheric Administration says current TED designs are 97 percent effective at excluding turtles from shrimp trawls.All marine turtles endemic to U.S. waters were given protection as either threatened or endangered species under the Endangered Species Act in 1978.
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