"Keeping tropical fish at home can have a calming…

“Endorphins” shouldn’t be confused with “indoor fins,” but there are jokes. “The reason tropical fish have such a calming effect is all to do with the indoor fins” was posted on Twitter by Jason on April 7, 2011. “Keeping tropical fish at home can have a calming effect on the brain, due to all the indoor fins” was posted on Twitter by Jason on February 2, 2019.

“What makes aquarium fish so happy? Their indoor-fins” was posted on Twitter by PUNS on October 21, 2012. “Why does keeping tropical fish in your home have a calming effect on the brain? Because of the indoor fins” was posted on Reddit—Jokes on July 19, 2016.

Wikipedia: Endorphins
Endorphins (contracted from “endogenous morphine”) are endogenous opioid neuropeptides and peptide hormones in humans and other animals. They are produced by the central nervous system and the pituitary gland

Twitter
Jason
@NickMotown
The reason tropical fish have such a calming effect is all to do with the indoor fins.
11:52 AM · Apr 7, 2011·Twitter Web Client

Twitter
Mark Lycett
@ItsCaptRedBeard
@AndyLycett
I’ve got myself an aquarium. The fish seem to make me feel calmed and chilled. It must be something to do with the indoor fins..
4:39 PM · Apr 20, 2011·Twitter Web Client

Twitter
PUNS
@omgthatspunny
What makes aquarium fish so happy? Their indoor-fins.
4:33 PM · Oct 21, 2012·Timely by Demandforce

Reddit—Jokes
Posted by u/fegoc180 July 19, 2016
Why does keeping tropical fish in your home have a calming effect on the brain?
Because of the indoor fins.

Twitter
Jason
@NickMotown
Keeping tropical fish at home can have a calming effect on the brain, due to all the indoor fins.
8:05 AM · Feb 2, 2019·Twitter Web Client

Twitter
🤣 The Dad Joke Man 😉
@DadJokeMan
Keeping tropical fish at home can have a calming effect on the brain.
This is due to all the indoor fins…
1:18 AM · May 8, 2019·Twitter for iPhone

Reddit—Oneliners
Posted by u/honolulu_oahu_mod August 10, 2019
Keeping tropical fish in your home has a calming effect on the brain because of the indoor fins.

“Keeping tropical fish at home can have a calming effect because of the indoor fins”