jack salmon vs walleye

jack salmon

noun
  • Sander vitreus. 

  • A Chinook salmon that returns to the fresh water one or two years early. 

  • Sander canadensis. 

  • Merluccius productus, a ray-finned fish found in the northeast Pacific Ocean. 

walleye

noun
  • A species of gamefish, Sander vitreus, native to the Northern U.S. and Canada with pale, reflective eyes. 

  • One or a pair of sideways-looking misaligned eyes. 

  • An unusually pale eye. 

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