Dolphins are very hard to keep. Some places do it well, others have had horrible results.
in my state bringing dolphins was huge (everyone donated money, bumper stickers were everywhere)
"The Oklahoma City Zoo's now-shuttered dolphin exhibit is the only other facility with a higher death rate than Dolphinaris. Between 1986 and 2001, the zoo housed 10 dolphins. The exhibit closed after four animals died in two years"
then there is dolphinaris...
An Arizona Republic analysis of federal data found the facility's death rate was unheard of in recent history.
www.azcentral.com