A sign warns skaters to stay off the thin ice at Johnson Pond on the Colby College campus in Waterville on Monday.

Ice fishermen braved the thin ice on McGrath Pond in Oakland to fish on Monday. Tyler Lunt, left, rebaits a fishing trap as Zack Vashon lines up the catch of brook trout.

Jack Traps CEO Timothy Jackson inspects a custom-made ice fishing trap at his retail and manufacturing shop in Monmouth on Monday. The sale of the hand-made ice fishing traps is dependent upon the upon mother nature, he said. “We’re all in her hands,” Jackson said.

Mark Dunham builds an ice fishing trap at the Jack Traps manufacturing shop in Monmouth on Monday. The ice fishing outfitter hand-builds traps that are sold around the globe. The late ice-in this year has put a pinch on business, but he’s optimistic it will pick up when the lakes freeze.