Rescue crews found the body Friday of a New Jersey teen believed to have drowned Wednesday.

Investigators say Jamire Gist, 16, was out for a day of fun.

But it looks like his tubing trip turned tragic, as the teen went missing.  Earlier Thursday rescuers found a body matching Gist's description.

On Friday, the Hunterdon County medical examiner positively identified the body as that of Gist, of Willingboro.

Around 1:30 Thursday, New Jersey Police say a body matching the physical description and wearing the same clothing of Gist was found eight feet under the Delaware River.

"Jamier was not wearing a life jacket," Kearns said.

Rescuers say trouble started Wednesday morning when the 16-year-old fell off his inner tube a half mile south of the Kingwood Boat launch in Hunterdon County, New Jersey.

The Burlington County teen was taking the trip with two other kids and three counselors from the Marlton Family Guidance Center.

"About half an hour after the launch, he separated from his tube.  He was observed going under the water.  The counselors sought help via 911 and called from a passerby's cell phone," Kearns added.

A massive search ensued but afternoon thunder stopped Wednesday's efforts.

Thursday morning the boats, dive teams, and ground searches were back at it.  At 1:30 the body matching the descriptioni of Gist was found.

"This section of the Delaware is very calm," said Greg Crance, who owns Delaware River Tubing.

Police said Gist's party rented their tubes from Delaware River Tubing. Crance's policy states for kayaks, canoes, and rafts anyone under 12 must wear a life vest.  For groups 20 or more the age is bumped to 18.

But on inner tubes, life vests are not required.

"Our staff tells everyone they should wear a life vest.  However, a lot of people just decide they do not want to take one with them," Crance said.

Hunterdon County Prosecutor Anthony Kearns says it's a dangerous mistake, as you never know what lies beneath the surface of the river.

Less than two weeks ago, another New Jersey teen drowned as he tried to swim across the Delaware 10 miles downstream.