Somebody is fudging the observations. Feeding on berries alone won't give them what they need.
I’ve seen videos where they aren’t even eating the fish - they catch them, peel the skin off, eat the skin for the fatty content and throw away the fish. If those bears were in fat production mode, they wouldn’t feel like eating berries at all if there were fish nearby. That’s what I would think.
LOL. I’m sure bears like Salmon, however when I lived in Wyoming there weren’t any Salmon and the grizzly bears seemed to be happy campers feeding on what was at hand. That goes for Colorado, and Montana too. No Salmon, plenty of bears.
The study came out of Oregon. Enuff said!