scientist have captured an extraordinary footage of a rarely seen giant bizarre deep sea fish in the gulf of Mexico the oarfish which is one of the world's longest fish reaches up to 17m it's strange appearance may have provided the basis for sea serpents myths told by early ocean travelers it has an unusual serpent like appearance now according to a report by BBC news the fish was filmed by mark benfield from Louisiana state university US
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Not only are they elongated, they also have a prominent dorsal fin which gives it an unusual "serpent" appearance.
The giant oarfish, which can reach 17m long, has previously only been seen on a few occasions dying at the sea surface, or dead washed ashore.
Now, according to a report by BBC News, the fish was filmed by Mark Benfield from Louisiana State University, Baton Rouge, US, who was undertaking a survey as part of the Serpent project, a collaboration between marine scientists and energy companies such as BP, Shell, Chevron and Petrobras working in the Gulf of Mexico.
Using a remotely operated vehicle (ROV), they caught a rare glimpse of the huge oarfish, perhaps the first sighting of the fish in its natural setting.
Recalling the event professor Benfield explained how at first, they thought the fish was simply a drilling pipe called a riser being lowered into the water.
"We saw this bright vertical shiny thing, I said 'are they lowering more riser?' as it looked like they were lowering a huge pipe. We zoomed in a little bit and we said 'that's not a riser that's a fish'," he said.
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"As we approached it retreated downwards swimming tail first in a vertical orientation as the ROV followed," professor Benfield explained.
The team followed the fish for about five minutes before breaking off contact to resume their surveys.
"What was interesting about the fish was its swimming behaviour," said professor Benfield. "It moved by undulating its dorsal fin in waves that propelled it backwards at quite a good speed," he added.
Early estimates measure the fish at between 5m and 10m in length.
Professor Benfield said this may be the first time the oarfish has been filmed alive swimming in the so-called mesoplagic layer of the ocean.
The fish was observed underneath Thunderhorse in the Gulf of Mexico, one of the largest semi-submersible oil rigs in the world.