beshow vs saithe

beshow

noun
  • A large food fish (Anoplopoma fimbria) of the north Pacific coast; the candlefish or sablefish. 

saithe

noun
  • The pollock or coalfish or coley (Pollachius virens). 

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