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The circular trap and bait bag have the same cut-up fish contents, but the bait bag has much more fish in it, acting as a "decoy" to lure hagfish and other non-targeted species away from the traps. The traps are intended to capture crabs for Dr. Tammy Frank's electrophysiological vision experiments. Attached to the large ball on the top of the bait bag is a "pinger," which emits a sonar signal so it can be easily located for recovery by the submersible. Video footage courtesy of Harbor Branch Oceanographic Institute.
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