You can definitely refreeze it. Almost all fish, and especially salmon, has been previously frozen. We buy extra when it’s on sale and freeze it all the time.
Or you could make it into something else that’s very different (ex: roast one day then cakes/burgers the next) and just keep eating it. But cook it or freeze it right away.

I'd either cook the whole thing and work the leftovers into breakfast (salmon frittata/omelet/crepes, etc).
Or I'd not cook the whole thing but cook for dinner tomorrow. I wouldn't use past Monday.
Don't refreeze it.

I bought three pounds of salmon yesterday, but our Christmas dinner numbers have dwindled (thanks, Covid!), and we will probably only have 4-5 salmon eaters. What are my options? (BTW, I’m the vegetarian who makes salmon for Christmas—from another thread—so I’m out of my depths here.)

(1) Cook it all—will it work for leftovers? Or is there anything it can be turned into the next day once it’s already been cooked? (Incidentally, our microwave isn’t working at the moment, so we wouldn’t be reheating in the microwave. I’ve seen all the internet memes about fish in the breakroom microwave.)
(2) Cook half of it another day this week—I bought it Saturday morning. When do I have to cook it by?
(3) Freeze half. It was “fresh but previously frozen” from the fish counter at Whole Foods. Does that mean I can’t refreeze it?

Appreciate your advice!