SeaWorld said the female orca named Kayla began to show “signs of discomfort” on Saturday and veterinarians immediately began treatment.

The last orca has been born in captivity at a SeaWorld park in San Antonio, just over a year after the theme park decided to stop breeding orcas following protests and declining ticket sales.

SeaWorld San Diego is ending its long-running killer whale show after years of outcry and falling attendance prompted it to renounce theatrical orca displays.