How long is a fishes memory and how is this tested??

Question: How long is a fishes memory and how is this tested??
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  fish
  
  memory
Asked by anon-287556 to Paul on 24 Mar 2021.
- Paul O'Nion answered on 15 Mar 2021:
  
  Check out this article from the New Scientist 🙂
  
  https://www.newscientist.com/lastword/mg23130821-000-memory-test/

Question: How long is a fishes memory and how is this tested??