Like when you say dead fish, it sounds bad. But consider the alternative—a gift of live salmon would be far more annoying and less convenient for most people.
That is a fascinating and disturbingly abusive prank - make someone responsible for killing a huge fish. What would they do - take it to a vet or a fishmonger or find a hammer? Call wildlife services for what you would buy in the supermarket the next day? It would be a pretty weird position to be in.