Bottlenose dolphin rescued from Massachusetts river dies

A bottlenose dolphin that was rescued from a Massachusetts river over the weekend has died.

Wildlife officials announced Monday that they were unable to stabilize the dolphin, which was swimming in circles in the Assonet River in Freetown on Saturday.

A spokeswoman for the International Fund for Animal Welfare says the dolphin died about 15 minutes after being rescued. Officials were concerned because the animal was thin and swimming in brackish water rather than its usual salt-water habitat.

The Standard-Times reports ( a necropsy is scheduled for this week.

Officials say the animal was a male, about 9 feet long and approximately 20 years old.

They were puzzled by the dolphin's presence in the area. The bottlenose dolphin's usual habitat is in open water in the mid-Atlantic area and southward.