Captivity

Life for captive whales and dolphins is nothing like a life in the sea. It is almost impossible to maintain a family group in captivity. Tanks only allow a few strokes in any direction before coming to a wall. Because tanks are shallow, the natural tendencies of whales and dolphins are reversed—they spend more than half their time at the tank's surface.
This unnatural situation can cause skin problems. In addition, in captive killer whales (orcas), it is the probable cause of dorsal fin collapse, as without the support of water, gravity pulls these tall appendages over as the whale matures. Collapsed fins are experienced by all captive male orcas and many captive female orcas, who were either captured as juveniles or who were born in captivity. However, they are observed in only about 1% of orcas in the wild.
In a tank, the environment is monotonous and limited in scope. Sonar clicks, the method by which individuals define their surroundings, have limited utility in such an environment. These animals, who are perpetually aware, have nothing like the varied stimulation of their natural environment. In perpetual motion, they are forced into literally endless circles. Life for these animals is a mere shadow of what it was in the wild.