The fire at the Seaview Harbor Marina in Egg Harbor Township broke out around 1 a.m. Monday and took several hours to bring under control. The marina is located near the causeway that connects to Longport and at the mouth a back bay and an inlet connecting to the ocean.
The vessels are about 50 to 60 feet long and each was carrying about 1,000 gallons of fuel, the Coast Guard told WPVI-TV. The boats were partially submerged at their docks.
A National Guard truck was brought in to spray foam to contain the fire and to try to keep the fuel from spreading across the water. Marina officials hired a firm to conduct an environmental cleanup, which the U.S. Coast Guard is supervising.
The Coast Guard said a salvage plan was underway, adding that the marina and boat owners are responsible for all cleanup and mitigation.
There were no reports of injuries, and officials say no wildlife was impacted.
Officials were trying to determine what caused the fires.