Most marlin that are caught in Hawaii are released. Here's a picture I took of a big lit up blue marlin just before the crew took the hook out and let the fish swim free. If the captain and angler are skilled and use heavy enough tackle to quickly land the fish, the chances of survival are increased, and many marlin have been caught, tagged, and shown to have travelled thousands of miles after their initial capture.
Organizations like The Great Marlin Race and The Billfish Foundation prove this with satellite tags which fall off of the marlin several months after they were implanted.
These tags float up to the surface and send data to computers on land that can determine how deep and often the marlin dove, what temperatures they were in, and their travel routes. For more information on the Great Marlin Race check this article out:
Marlin Travels 2225 Miles in 94 Days.
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