Telepathy doesn’t have anything to do with fish, but the term “tilapiathy” (tilapia + telepathy) has been used in many jokes. “Did you hear about the fish who could see into the future? He had tilapiathy” was posted on Twitter by Shay Spence on January 25, 2012:

This tilapia riddle was posted on Reddit—3amjokes on December 8, 2019:

Q: How do brackish fish communicate?
A: Using tilapiathy.


Wikipedia: Tilapia
Tilapia (/tɪˈlɑːpiə/ tih-LAH-pee-ə) is the common name for nearly a hundred species of cichlid fish from the coelotilapine, coptodonine, heterotilapine, oreochromine, pelmatolapiine and tilapiine tribes (formerly all were in Tilapiini), with the economically most important species placed in Coptodonini and Oreochromini. Tilapia are mainly freshwater fish inhabiting shallow streams, ponds, rivers, and lakes, and less commonly found living in brackish water.

Twitter
Shay Spence
@chezspence
Did you hear about the fish who could see into the future? He had tilapiathy. @danimken
9:37 PM · Jan 25, 2012·TweetCaster for iOS

Twitter
Devon Tyler Terry
@devon_terry
“How’d you know I ordered fish? You weren’t there..” I have tilapiathy
4:38 PM · Apr 29, 2012·Twitter for Android

Twitter
Kirsten Bass
@kirstenlbass
The ability to communicate with fish: Tilapiathy.
1:00 AM · Mar 17, 2013·Twitter for iPhone

Twitter
Mary Laké
@marybeth181124
How do the twin fish communicate? Twin tilapiathy 😂🐠
4:07 PM · Jun 17, 2013·Twitter for iPhone

Twitter
Eric Brown
@ericbrownsucks
Wait, tilapiathy is when a fish reads minds.  Its a verb, not a noun.  Haha haha.  :(
10:05 AM · Jul 2, 2014·Twitter SMS

Twitter
Bradley Traynor
@bradleytraynor
Tilapiathy = the ability to tell what kind of fish I’m thinking of. #thingsyoucanonlyhearonTeamCoBra
@mytalkcolleen
3:01 PM · Sep 8, 2014·Twitter Web Client

Twitter
Melissa Rice
@meligrapejelly
Tilapiathy. Noun. Communicating about fish using telepathy.
1:07 PM · Apr 9, 2015·Twitter for iPhone

Twitter
deebo
@sunnydeebo
tilapiathy: the ability to read the minds of tilapia and only tilapia
6:06 PM · Jun 18, 2016·Twitter for iPhone

Twitter
Jim
@GibJimson
customer: how do you communicate with a fish?
me: tilapiathy
c: who sent you?
4:48 PM · Feb 14, 2017·Twitter for iPhone

Twitter
Zach Stevenson
@ZachStevenson
Mental Tilapiathy: when your fish dinner knows what you’re thinking
1:38 PM · Apr 12, 2017·Twitter Web Client

Twitter
Clown Shoes
@__Jive_Turkey__
Make up a shitty super power:
Tilapiathy. Its like telepathy but you can only read the minds of tilapia
1:47 PM · Feb 9, 2018 from Marion, IL·Twitter for iPhone

Reddit—3amjokes
Posted by u/ILikeGreenPotatoes December 8, 2019
How do brackish fish communicate?
Using tilapiathy.

Reddit—Dadjokes
Posted by u/beardwithablog January 19, 2020
Did you know certain fish can read minds?
It’s called “Tilapiathy”.