The fish is believed to have been between 50 and 70 years old, wildlife officials said.
It was the first ever caught in the area, said state fish and wildlife officials.
But for now, wildlife officials are working to repair its effect.
The dead animals were found in an area accessible to wildlife officials.
Today, Maine has at least 21,000 of the animals, wildlife officials say.
Although the lion population is growing by 3 percent a year, wildlife officials are cautious about the future.
Meat from bison shot by wildlife officials would be given to the poor.
About 400 beavers are killed in this way each year, wildlife officials said.
Unless the animals are moved, they will be extinct within two or three years, wildlife officials said.
Wildlife officials have been leaving out food, and it has been taken.