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Question:

The tags must contain some sort of electronics to store information. Does the tags left in the water affect the ocean in any way once the animal dies? If they don't dissolve quickly the other animals might also swallow the same.

Answer:

Some tags can be recovered -- in fact, there's a hefty reward for them. Archival tags are surgically inserted in the abdominal cavities of bluefin and yellowfin tuna. We recover them when people ...

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