orange roughy vs red snapper

orange roughy

noun
  • An edible deep-sea fish, Hoplostethus atlanticus, belonging to the slimehead family (Trachichthyidae). 

red snapper

noun
  • Any of several Atlantic foodfishes, of the genus Lutjanus, that have reddish bodies 

  • Rhomboplites aurorubens (vermillion snapper) 

How often have the words orange roughy and red snapper occurred in a corpus of books? (source: Google Ngram Viewer )