“How do fish celebrate Christmas?”/“By hanging reefs on the door.”

A Christmas riddle is:
 
Q: How do fish celebrate Christmas?
A: By hanging reefs on the door.

 
The reefs/wreaths pun has been cited in print since at least 2004.
 
       
Google Books
Crazy Christmas Jokes
By Alison Grambs
New York, NY: Sterling Publishing Company, Inc.
2004
Pg. 27:
How do fish celebrate Christmas?
By hanging holiday reefs on the door.
 
Twitter
Max‏
@Maxamillion16
How do fish celebrate Christmas?  They hang REEFS on the door! =)
8:21 AM - 21 Dec 2009
     
Twitter
Divers Direct‏
@DiversDirect
How do fish celebrate Christmas? ...They hang REEFS on your door! AHAHAHAHAAAAHAA! LOL!
11:09 AM - 24 Dec 2010
 
Google Books
Insults Anywhere Kids Presents
T’was The Jokes Before Christmas

By Franklin Yantz
Insults Anywhere
2014
Pg. ?:
How do fish celebrate Christmas?
[They hang REEFS on the door]
 
Reddit—Oneliners
Fish celebrate Christmas by hanging reefs on the door.
submitted December 16, 2017 by madazzahatter