channel bass vs roughy

channel bass

noun
  • Sciaenops ocellatus, a large red edible fish. 

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 channel bass and roughy occurred in a corpus of books? (source: Google Ngram Viewer )