Can there be 10,000 calories in a salmon?

Watching a Nature program. Momma grizzly bear swam 20 feet down to the bottom of a lake and caught a salmon. It was a sockeye. It wasn’t super huge, as far as I could tell (of course, it was in the mouth of a grizzly bear,) and she brought it to shore to share with her cubs.

The narrator (Spock, actually) said, “Mmmm. 10,000 calories of pure protein.” I replayed it to double check that he did, actually, say “ten-thousand” calories.