An information board in the aquarium will provide information about this fish.
"Oarfish are a sea-dwelling fish with long, thin, silver bodies and one red fin lining their backs. They can reach lengths of over 10 yards, making them huge and striking fish. They usually swim by twisting their long, thin bodies, but they can also swim in more vertical positions. Their mouths are small compared to their bodies and they have no teeth, so they're large but not imposing."
In real life
The Giant Oarfish, also known as the King of Destruction, can be found worldwide, it is the world's longest bony fish, reaching lengths of up 36 ft (though they're commonly found at 9.8 ft). Its physical characteristics and its wave-like swimming have led to speculation that it may be the source of many "sea-serpent" sightings.
Since it's rare to encounter this fish, little is known of their behavior and ecology. Apparently, they're solitary animals, frequently diving up to 3,300 ft. They feed mainly on plankton.