A dead shark found in a reef in China has sparked fears of the extinction of the species.
The fish was found in waters off the Chinese coastal city of Ningbo, a city of about 4 million people.
The National Oceanic and Atmospheric Administration said it is not known when or how the fish was killed.
But the agency said the fish is an example of a species called the Asian carp, which is native to the Pacific Ocean.
“It’s one of the most threatened species of carp in the world and we know that there are some very dangerous species,” said Kevin G. Tod, deputy director of the U.S. Fish and Wildlife Service.
“If you kill one, it’s like a death sentence.”
“I have a hard time believing that they have the fish in their tanks at all, especially when you look at the other species in there,” said Bob Henson, a scientist at the University of South Florida.
He said the Asian cormorant is one of only two known species of cormors in the Pacific, and they are found mostly in the waters of South America.
Cormorants are not known to be aggressive toward humans.
The Asian carp is a big threat to the food web of other marine animals, including tuna and walruses.
Toxicology tests on the fish showed it has high levels of mercury and cadmium, which are toxic to fish.
Scientists believe the fish died from exposure to the chemicals, but not how it died.
The EPA has issued a warning about the fish, saying it is the first of its kind in the United States.
The agency has asked for public comments on its notice of concern.