fish farm vs piscina

fish farm

noun
  • A place or facility dedicated to the raising of fish or other seafood for sale. 

piscina

noun
  • A basin or tank, especially one for holding fishes or for growing aquatic plants. 

  • A drained basin near a church's altar for the disposal of water from liturgical ablutions. 

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