DETROIT, Michigan - A 100-year-old sturgeon, a fish weighing 240-pounds, was caught last week in a Michigan river.
Caught in the Detroit River, the fish is one of the largest lake sturgeons ever caught in the United States, according to the Alpena Fish and Wildlife Conservation Office.
Labeled a "river monster," the sturgeon weighed 240 pounds and measured 6 feet, 10 inches long.
Based on its length and weight, officials said the fish was likely more than 100 years old.
The sturgeon was released back into the river after being measured.
The conservation office published a photo showing one of its staff members lying next to the fish in a boat.
Officials note that female sturgeons can live 150 years, according to the National Wildlife Federation. They have been declared a threatened species in Michigan since 1994.
Sturgeons are nicknamed the "Giant of the Great Lakes." In spite of their size, they are considered docile fish, the U.S. Fish & Wildlife Service said.