herring vs twaite shad

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. 

twaite shad

noun
  • A fish in the herring family Clupeidae, Alosa fallax, found in the eastern Atlantic Ocean and the Mediterranean Sea. 

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