Mysterious Mustelid in Magnetawan River

While on a hike along Magnetawan River by the waterfalls of Brook's Falls, Ontario, I spotted this little one. I am not used to the focus yet, and I was also too excited to hold the camera still.
There is often mustelid sightings all in the area of Magnetawan and its river system. These include otters, minks, and fishers, all of which are very fascinating creatures to observe in the wild. This little one was hunting something, as you can see him flail around in the water after jumping in.

[davedaveson]

Its a mink probably, or one of the other members of the weasel family