人工授精
The first killer whale conceived through artificial insemination was male Nakai, who was born to Kasatka and father Tilikum at the SeaWorld park in San Diego in September 2001. A female killer whale named Kohana, the second killer whale conceived in this manner, was born at the same park eight months later. Artificial insemination lets park owners maintain a healthier genetic mix in the small groups of killer whales at each park while avoiding the stress of moving the animals between marinas.