bergylt vs roughy

bergylt

noun
  • The Ballan wrasse, Labrus bergylta another North Atlantic fish 

  • The rose fish, an edible red fish found in the North Atlantic, Sebastes norvegicus. 

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