A 2004 paper published by Todd Robeck, SeaWorld's head of orca breeding, describes the use of Regu-Mate to stimulate ovulation in female whales. Such contraceptives were used to regulate pregnancy, Hargrove said, but he added that with some drugs, the chemicals were so strong they could only be administered by male trainers.

"They could potentially cause a female trainer to become sterile," Hargrove explained. "We [the male trainers] would have to wear gloves, inject it into fish and put it on special plate. Afterwards, everything had to be sterilized and bleached."

Orcas have also reportedly received other medications, including up to 80 pounds of gelatin a day to prevent dehydration.

Trainers allege that through all of this, SeaWorld was allowing them to swim right next to whales who had been given serious medications, expressing concerns that their own safety was being jeopardized. Following the death of trainer Dawn Brancheau in 2010, trainers are no longer allowed to swim with orcas. But for the whales, a life of medicated solitude in a tiny tank continues.

SeaWorld did not respond to The Dodo's request for comment.