allis shad vs lancetfish

allis shad

noun
  • A herring-like fish (Alosa alosa), of the eastern Atlantic that migrates to fresh water to spawn. 

lancetfish

noun
  • A voracious deep-sea fish in the genus Alepisaurus, having long, lancet-like teeth. 

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