Spanish mackerel vs saurel

Spanish mackerel

noun
  • Any member of a tribe of mackerel (Scomberomorini) 

saurel

noun
  • Any carangoid fish of the genus Trachurus, especially Trachurus trachurus, of Europe and America, and Trachurus picturatus of California; the skipjack, scad or horse mackerel. 

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