Atlantic herring vs herring

Atlantic herring

noun
  • Clupea harengus, an abundant species of herring and an important food fish living in the North Atlantic. 

herring

noun
  • Fish in the family Clupeidae. 

  • A type of small, oily fish of the genus Clupea, often used as food. 

  • Fish similar to those in genus Clupea, many of those in the order Clupeiformes. 

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