Authorities say Edward Broderick was last heard from Dec. 14, when he told a friend that his vessel was en route to a clamming facility in Highlands.
The friend reported him missing about four hours later, and Broderick's submerged vessel was found and identified outside the marina where he originally intended to end his trip.
Broderick was last seen wearing gray or green sweatpants.
Police had been searching the water using side-scan sonar technology, said Sgt. Adam Grossman, a State Police spokesman.
Grossman says they plan to resume the search sometime this week.