Jeff Rotman / Diver examining hooked Swordfish {Xiphias gladius} caught on longline fishing hook, underneath boat, Cocos Island, Costa Rica, Pacific Ocean, WHS

Norbert Wu / Swordfish (Xiphias gladius) worldwide, can tolerate temperatures of five degrees Celsius and dive to 650 meters, uses sword to kill prey such as squid, can grow to 14 feet and 1200 pounds, Sardinia, I...

Jeff Rotman / Swordfish {Xiphias gladius} caught on long-line fishing gear, Cocos Is, Costa Rica

Ralph Pace / Swordfish (Xiphias gladius) with tags to determine effectiveness of fishing gear, San Diego, California

Ralph Pace / Swordfish (Xiphias gladius) with tags to determine effectiveness of fishing gear, San Diego, California

Norbert Wu / Swordfish (Xiphias gladius) worldwide, can tolerate temperatures of five degrees Celsius and dive to 650 meters, uses sword to kill prey such as squid, Sardinia, Italy, Mediterranean Sea

Norbert Wu / Swordfish (Xiphias gladius) caught in fishing net, population is threatened by overfishing, worldwide, Sardinia, Italy, Mediterranean sea

Norbert Wu / Swordfish (Xiphias gladius) worldwide, can tolerate temperatures of five degrees Celsius and dive to 650 meters, uses sword to kill prey such as squid, can grow to 14 feet and 1200 pounds, Sardinia, I...

Norbert Wu / Swordfish (Xiphias gladius) swimming, sword used to kill prey such as squid, Mediterranean Sea, Sardinia, Italy

Roberto Rinaldi / A tourist with his catch of the day, a swordfish (Xiphias gladius), Benguerra Island, Mozambique

Ralph Pace / Swordfish (Xiphias gladius) being tagged by biologists, Monterey, California

Ralph Pace / Swordfish (Xiphias gladius) satellite tag on harpoon, Taltal, Chile

Ralph Pace / Swordfish (Xiphias gladius) biologist, Chugey Sepulveda, and fisherman preparing to tag animal, Taltal, Chile

Ralph Pace / Swordfish (Xiphias gladius) being hunted by fisherman, Taltal, Chile

Ralph Pace / Swordfish (Xiphias gladius) lure, Taltal, Chile

Ralph Pace / Swordfish (Xiphias gladius) swimming along surface, Taltal, Chile

Ralph Pace / Swordfish (Xiphias gladius) biologists tagging fish to determine effectiveness of fishing gear, San Diego, California

Ralph Pace / Swordfish (Xiphias gladius) with tags to determine effectiveness of fishing gear, San Diego, California

Ralph Pace / Swordfish (Xiphias gladius) caught by fisherman, San Diego, California

Ralph Pace / Swordfish (Xiphias gladius) with tags to determine effectiveness of fishing gear, San Diego, California

Ralph Pace / Swordfish (Xiphias gladius) being harvested by fisherman, San Diego, California

Ralph Pace / Swordfish (Xiphias gladius) caught on deep-set buoy gear, San Diego, California