shad vs tarpon

shad

noun
  • Any one of several species of food fishes that make up the genus Alosa in the family Clupeidae, to which the herrings also belong; river herring. 

  • The bluefish (Pomatomus saltatrix). 

tarpon

noun
  • Any of several fishes of the family Elopidae or Megalopidae, especially a large silvery game fish. 

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