sablefish vs shoemaker

sablefish

noun
  • A dark-coloured marine fish, Anoplopoma fimbria, of North American Pacific waters. 

shoemaker

noun
  • A fish, Elagatis pinnulatis, the runner. 

  • The threadfish. 

  • A person who makes shoes 

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