After looking at its sharp teeth, long bod, and "frightening" face, Russian fishermen are still trying to determine exactly what they caught.
Using earthworms as bait, fishermen caught an interesting-looking creature in the Kama River in the Udmurt Republic in central Russia, the Daily Mail reports. The fish, which appears to be about 2 feet long, shocked the men when they retrieved it from the water.
The fisherman have said that the creature is likely a mutated version of a Perccottus Glenii, also known as the Amur Sleeper or Chinese Sleeper.
Chinese sleepers, which are freshwater fish that originated from the Amur River basin in eastern Asia, were originally kept as pets when they were first brought into Russia in the 1940s. When the sleepers grew to an unmanageable size, many of the owners reportedly released them into sewage systems and rivers throughout the area. Throughout the past several decades, these fish have been able to survive and their numbers have increased throughout Russia, according to local experts.
However, others have reportedly said the animal is piranha or a mutated Anguilla Anguilla, a type of European eel.
Commenters on the Daily Mail were less impressed and disagreed with all of the above.
"It's a Wolf Eel people... Back to your regularly scheduled program," one commenter wrote.
"Wolf fish, actually," another added. "Not a wolf eel, but closely related."
"The wrinkles are from being in the water too long this happens to me all the time," another joked.
Wolffish and Wolf Eels are part of the Anarhichadidae family, according to Real Monstrosities. Other among things, some of the features these fish have in common are their disturbing-looking faces.
"One thing they all have in common is what's known as 'a face only a mother could love,'" Real Monstrosities explained. " ... It's a unique sort of ugly, though. Certainly for a fish."
Wolf Eels, as the name would suggest, grow to be much longer than their Wolffish counterparts as they reach over 6.5 feet long. The Bering Wolffish is the smallest, as they only grow to be about 3.3 feet long.