“What’s the opposite of a fish out of water?”/“A fish in sea.”

“A fish in sea” sounds like the word “efficiency.” There have been several puns and riddles. “Efficiency (A Fish In Sea), a film about a man’s preoccupation with fish” was printed in the Vancouver (BC) Sun on May 2, 1987.
 
A riddle was posted on Twitter on September 15, 2011:
 
Q: What’s the most productive animal?
A: A fish in sea! (Efficiency!)
 
Another riddle was posted on Twitter on October 1, 2017:
 
Q: What`s the opposite of a fish out of water?
A: A fish in sea (Efficiency)
 
     
2 May 1987, Vancouver (BC) Sun, “SFU program is heavy on experimental works” by Andrew Marke, pg. H11:
SFU STUDENT FILMS. Today (9:30 p.m.) and Sunday (2 and 7:30 p.m.). At the Pacific Cine Centre.
 
Efficiency (A Fish In Sea), a film about a man’s preoccupation with fish, and the experimental short Bridges are two of nine films and videos to be shown this weekend at Pacific Cine Centre when Simon Fraser University film students unveil their year’s work.
     
Google Groups: relcom.humor
New Isreal ambassador
Vladimir A. Pertzel
8/14/02
(...)
Faith described the marshal’s duties. “And you must pay close attention, he’s a model of efficiency and -”
 
“REGA!” Itzik typed in “model of a fish in sea.” The computer didn’t know what to make of that.
     
Twitter
Daniel Hammond‏
@danielthelion
efficiency sounds like a fish in sea.
12:38 PM - 30 Apr 2009
 
Twitter   
☣ ☠ ☢‏
@zombot
Economists strive for efficiency. Marine biologists search for a fish in sea.
10:01 PM - 3 Oct 2009
   
Twitter
Danielle Magaard‏
@HeyDeez
@iansmusiccafe Why would SeaWorld need to hire an efficiency expert when they already have a ton of a-fish-in-sea experts (via @rewindstuff)
3:41 PM - 23 Aug 2010
 
Twitter
Rikin Vasani‏
@appreciative
Q: What’s the most productive animal?
A: A fish in sea! (Efficiency!)
I know, I know, I’m a genius.
12:55 AM - 15 Sep 2011
   
Twitter
Lauren Sepe‏
@ljsepe
How did the tuna get the job done quickly? With a fish in sea. Because he knows the value of teamwork. #jokes #efficiency #sealife #teamwork
9:37 PM - 19 Feb 2014
 
Reddit—Shower Thoughts
The word “Efficiency” can be pronounced “A Fish in Sea”
submitted November 6, 2014 by Atalantic
   
Twitter
Notorious P.I.G.‏
@DJ_Digipig
A shark can swim faster in the water than on land. Why? Because it’s efficiency. Heh. A-FISH-IN-SEA CORAL!
12:29 AM - 31 Dec 2015
   
Twitter
David Turley‏
@RiotPhreak
What’s the first rule of catching salmon? A-fish-in-sea (efficiency) #punsofdamage
1:07 PM - 27 Sep 2016
 
Twitter
Jefy_hunt‏
@notnothing
Q. What`s the opposite of a fish out of water?
A. A fish in sea (Efficiency)
#UnJokes2017
5:43 AM - 1 Oct 2017
 
Reddit—Jokes
How do schools of fish meet their annual goals?
submitted January 4, 2018 by yungzoloft
They call in a-fish-in-sea experts.