Fishing out some answers.  Fish and omega-3 fats are good for you--that much we know.  But it gets complicated after that.
D000818:Animals; D015525:Fatty Acids, Omega-3 / Q000008:administration & dosage*; D005399:Fishes; D005502:Food; D006801:Humans
D015525:Fatty Acids, Omega-3