CHASSELL, Mich. (AP) -

Authorities are searching Lake Superior for three boaters, including a 9-year-old boy and his father who did not return from a fishing trip in the vicinity of the Keweenaw Peninsula.

Family members called police when the boaters didn't return for a fish fry Saturday night. The trio had departed from Michigan's Upper Peninsula.

U.S. Coast Guard Ensign Michael Jenkins says the search continued Monday morning by boat and helicopter. He says a small craft advisory was in effect on the lake, with one-foot waves reported.

State police Sgt. Jamie Patterson says the lake may have been choppy Saturday, but the weather was "pretty decent."

Steve Chartre and his son Ethan, are from Ishpeming and they were with 61-year-old Keith Karvonen of Atlantic Mine.

The search involves state police, the U.S. and Canadian coast guards and local police.