Xiang He, 38, went missing on Oct. 8. Authorities have been searching the waterways for him since Wednesday.
On Tuesday, Bensalem Sgt. Andrew Aninsman told Patch, "we are doing sporadic searches of the waterways."
A Delanco, N.J. resident last week located an unmanned kayak off the shore of the Delaware River, which police identified as the missing kayak owned by Mr. He.
He is still missing and is now believed to have died in the Delaware River, according to Bensalem Police.
The missing man's vehicle was recovered at the boat dock, police said.
Anyone with information is asked to contact the Bensalem Police Department at 215-633-3719.