I gotta add to this above. Puffer fish are fun to mess with, and it doesn't hurt them. Many times on SCUBA, I have chased down and caught puffers. They are rock hard when they puff up, since the fill up with water.
This makes them have too much mass to really do anything like swimming. So you can pass it back and forth to other divers like a slow basketball 60 feet underwater.
We useta have one named "Funny Face" in one of our salt water aquariums. He was hand tame. If you put your hand in the tank he would come over and lay in it so you could pet him with your other hand. He had a wonderful smile, and looked at you like a puppy:
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We fed him his very best favorite: Fiddler crabs. We had an unlimited supply. He would eat 30 or so at a time, and eventually he would no longer be able to swim... But his eyes would swivel, watching a fiddler crab go walking by him.
The downside: When Funny Face took a dump, he fouled a 50-gallon tank! I had to use a special filter to recycle the water. It had parts of claws and legs from the sacrificial crabs, as well as simple crud. But he was worth it.
He thrived so well, he got to where the even bigger 75 gallon tank was too small. We took him down to the canal where we always got our fiddler crabs to turn him loose. My son, Scooter was 14 at the time, and was extremely fond of our pet puffer. So he was delegated to turn it loose.
This led to a Family scene well remembered by Puck, Scott, Herself, and me: Scotty picked up Funny Face and walked out shin-deep in the canal and turn him loose.
Funny Face swam three feet, did a U-turn, swam back and plunked down between Scotty's bare feet. Scotty moved. Funny Face moved between again. A couple more moves, and Scotty found the grit to leave the water. Funny Face came into about 6 inches of water at the canal's edge, and laid there looking at all four of us.
Scotty cried. (I got a little chokey, too.)