Florida Fish and Wildife via Flickr

The eyeball that caused a sensation was cut from a swordfish's head, apparently by a fisherman, scientists say.

The giant eyeball from Florida that captured the world's attention came from a swordfish, scientists reported today. They said straight-line slashes on the softball-sized orb suggest that it was freshly cut out of the fish's head by a fisherman and tossed overboard. The fact that it washed ashore and was found by a beachcomber so quickly contributed to a rare string of circumstances that sparked last week's collective "ewws" and "ahhs."

"It's definitely been unusual to have a situation quite like this," Kevin Baxter, a spokesman for the Florida Fish and Wildlife Conservation Commission, told me today. The commission has been fielding tons of inquiries ever since pictures of the eerie eyeball turned up on Thursday. If you haven't seen them yet, be sure to check out the commission's Facebook page and Flickr gallery.

Observers had speculated that the eye might have come from a large fish, or a giant squid, or even a whale — but in retrospect, the scenario involving a swordfish caught at sea seems to make the most sense. Genetic testing is being conducted to confirm the hypothesis.

Here's the explanation from the commission's news release:

"After examining an eye found on a south Florida beach this week, researchers from the Florida Fish and Wildlife Conservation Commission believe the specimen came from a swordfish. Genetic testing will be done to confirm the identification.

"'Experts on site and remotely have viewed and analyzed the eye, and based on its color, size and structure, along with the presence of bone around it, we believe the eye came from a swordfish,' said Joan Herrera, curator of collections at the FWC’s Fish and Wildlife Research Institute in St. Petersburg. 'Based on straight-line cuts visible around the eye, we believe it was removed by a fisherman and discarded.'

"The approximately softball-size eye was recovered by a citizen in Pompano Beach on Wednesday. FWC staff received the eye later that day. Swordfish are commonly fished in the Florida Straits offshore of south Florida at this time of year.

"A highly migratory fish, swordfish can be found from the surface to as deep as 2,000 feet. Swordfish in the Atlantic can reach a maximum size of over 1,100 pounds, according to the National Oceanic and Atmospheric Administration. Swordfish feed on a wide variety of fish and invertebrates."

More sea marvels:

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• Gallery: 10 deep-sea secrets revealed

Alan Boyle is NBCNews.com's science editor. Connect with the Cosmic Log community by "liking" the log's Facebook page, following @b0yle on Twitter and adding the Cosmic Log page to your Google+ presence. To keep up with Cosmic Log as well as NBCNews.com's other stories about science and space, sign up for the Tech & Science newsletter, delivered to your email in-box every weekday. You can also check out "The Case for Pluto," my book about the controversial dwarf planet and the search for new worlds.

Carli Segelson / Fla. FWCC via AP

A photo from the Florida Fish and Wildlife Conservation Commission shows a giant eyeball from a mysterious sea creature that washed ashore and was found by a man walking the beach in Pompano Beach, Fla., on Wednesday. The eyeball will be sent to the Florida Fish and Wildlife Research Institute in St. Petersburg, Fla.

A giant eyeball that washed ashore and was found by a beachcomber in Pompano Beach, Fla., is mystifying wildlife officials — but probably not for long.

The softball-sized eyeball was reported to the Florida Fish and Wildlife Conservation Commission on Wednesday, and wildlife officers put the specimen on ice. It will be preserved and sent to the Fish and Wildlife Research Institute in St. Petersburg, Fla., for analysis.

Marine biologists couldn't immediately identify which species of sea creature would be associated with the eye, but researchers will use genetic testing if necessary to solve the mystery, said Carli Segelson, a spokeswoman for the commission. "I shouldn't say this, but they may be able to eyeball it," she told me today.

Segelson said she's been fielding tons of inquiries about the case, especially since a picture of "THE MYSTERY EYEBALL" was posted to the commission's Facebook page. "It's just gone viral," she said. There are more pictures in the commission's Flickr photo gallery.

Some have suggested that the eye came from a monster fish, a giant squid or even a whale. It does look a bit like this picture of an eye from a giant squid, but Segelson said wildlife officers are leaning toward a different scenario.

"The primary suspect right now is that it would be a large fish," she said. Among the possibilities are a swordfish, or a tuna, or some sort of deep-water fish species.

What do you think it is? Feel free to give it your best shot a comment below, and keep your eyes peeled for the answer.

More sea marvels:

• Florida fishermen pick up dying giant squid
• Hawaiian squid carries a built-in light
• Boy finds a bonanza in whale vomit
• Gallery: 10 deep-sea secrets revealed

Alan Boyle is NBCNews.com's science editor. Connect with the Cosmic Log community by "liking" the log's Facebook page, following @b0yle on Twitter and adding the Cosmic Log page to your Google+ presence. To keep up with Cosmic Log as well as NBCNews.com's other stories about science and space, sign up for the Tech & Science newsletter, delivered to your email in-box every weekday. You can also check out "The Case for Pluto," my book about the controversial dwarf planet and the search for new worlds.

Marine biologists say the spooky "Cascade Creature" seen drifting through the deep sea in a viral video isn't a whale placenta, a parachute, a plastic bag or an alien visitor: It's a type of jellyfish known as a Deepstaria enigmatica.

The video, which was apparently captured by a remotely operated vehicle near an underwater drilling site, caused a bit of a stir over the past couple of weeks among weird-science fans. Now it looks as if the truth is out there, thanks to assessments from experts such as Steven Haddock at the Monterey Bay Aquarium Research Institute and Craig McClain at the National Evolutionary Synthesis Center.

"This bag-like jelly is not that rare, but is large, so rarely seen intact," Haddock and his colleagues write on the JellyWatch Facebook page. "In the video, the swirling from the sub makes the medusa appear to undulate, and it even turns inside-out." They provide a helpful picture of a more typical specimen.

McClain is even more helpful in his posting at Deep Sea News. He provides citations on previous sightings of the beast, including explanations for the jellyfish's weirdly collapsed shape. And he shows through photographs and drawings that the strange appendage and whitish lumps seen in the video are D. enigmatica's gonads. TMI, Craig ... TMI.

For a third opinion, look no further than Australia's Nine News, which quotes Daniel Bucher, a marine biologist at Southern Cross University, as saying that the gonads were the giveaway.

Now that we've settled that, bring on the next sea monster.

More sea monsters:

• Iceland's monster unmasked
• Monster bug? It's no joke!
• Nessie-like monster filmed in Alaska
• Why giant squid have basketball eyes
• Fishermen pick up dying giant squid

Alan Boyle is msnbc.com's science editor. Connect with the Cosmic Log community by "liking" the log's Facebook page, following @b0yle on Twitter and adding the Cosmic Log page to your Google+ presence. You can also check out "The Case for Pluto," my book about the controversial dwarf planet and the search for new worlds.