Salmon is an anadromous fish - spawn and start life in freshwater before moving to saltwater. I used to catch them in the Pacific Ocean off Vancouver Island so the rule still stands.
Cod is the other fish frequently recommended also saltwater
Shrimp as well.
And its Salmon pellets as in fed to Salmon - the ingredients list fish meal so theres a question as to what fish that is. Rangen in the producer of those pellets. Frequently repackaged and resold.