rose fish vs roughy

rose fish

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

roughy

noun
  • Any of several marine fish of the related genus Trachichthys, which have rough and spiny scales. 

  • The orange roughy, Hoplostethus atlanticus. 

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