Is it illegal to capture orcas?

Excuse me, I've been reading up on various conservation efforts and I came across a topic that's piqued my interest. I was wondering, is it actually illegal to capture orcas, the majestic killer whales? I understand that they're highly intelligent creatures and their populations are already under threat due to various factors. So, is it against the law to hunt, capture, or keep orcas in captivity for entertainment or any other purpose? I'd appreciate your insights on this matter.