orange roughy vs rose fish

orange roughy

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

rose fish

noun
  • A large marine food fish, Sebastes norvegicus, that lives off the North Atlantic coasts of Europe and North America. 

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