Great work on memory of goldfish. We know our koi can do even better.  
 
"It’s long been a common belief that fish have the memory capacity of only a few seconds. People often make fun of people with bad short-term memory by saying they have the “memory of a goldfish.”
 
This belief about fish spread even further after being highlighted in Disney’s “Finding Nemo” films where Dory, played by Ellen DeGeneres, has a memory that lasts only about 10 seconds. However, a new study from Oxford University may have just proved that we got Dory all wrong."
 
https://www.upworthy.com/study-disproves-goldfish-memory-theory
 
For the reseach paper from Oxford University - https://royalsocietypublishing.org/doi/10.1098/rspb.2022.1220