The United States Coast Guard says it is suspending the search for a 74-year-old kayaker who went missing on the Raritan Bay.

Search efforts for Zhenjiang Ding began on Monday evening and continued all day Tuesday. Crews covered about 129-square-nautical miles for over 37 search hours, with no signs of Ding, according to officials.

Ding's friends say he is a skilled kayaker - who modified his craft so it would be safer to use on the open water.

He set out Monday afternoon, but when he didn't return, a massive search started from the air and water. His kayak and some belongings were said to have washed up near Cedar Street Park.

“Our thoughts and heartfelt condolences go out to the family and friends of Mr. Zhenjiang Ding,” said Capt. Jonathan Andrechik, Deputy Commander of Coast Guard Sector New York. “Making the decision to suspend a search is always difficult. We are appreciative of the efforts of all agencies who participated in this search.”

Ding's next-door neighbors say he is an experienced kayaker who loves to fish.