Luke Newman turned in a double-double with 26 points and 10 rebounds as the Otters corralled a total of 39 boards on the night. Henry Bethel contributed 14 points and pulled down 5 rebounds.
Brandton Marsh led Detroit Lakes with a 20 point performance. Mason Carrier had 14 and Nathan Cihak added 10.
Fergus Falls (5-4) travels to Alexandria for a Central Lakes Conference contest on Thursday night.
The Lakers have now lost seven in a row. They will host Thief River Falls on Thursday.