Yes, and we have all seen koi in cramped tanks, too small of ponds without adequate filtration and oxygen.  Another reason Koi Organization International (K.O.I.) exists.  
 
K.O.I. is an international group of expert hobbyist-volunteers who want to promote FUN in the Koi hobby by teaching all aspects of Koi and pond keeping, with a focus on Science. 
 
PARIS, Jan 22 (Reuters) - A leading French aquarium vendor has decided to stop selling round fish bowls because they drive fish mad and kill them quickly.
French pet care market leader AgroBiothers Laboratoire will no longer sell any aquariums with a capacity of less than 15 litres and only rectangular ones, as putting fish in small bowls without filtration and oxygenation is animal abuse, it said.
 
https://www.reuters.com/lifestyle/french-pet-care-firm-stops-selling-fis...