This is Beluga whale.
It’s not the meat of the whale the delicacy part is the skin and blubber.
It is cut up into little squares and served cold like sushi. It usually gets served with raw onions and broccoli on top and soya sauce. You can eat it with the skin on or you can cut the skin part off. Having an iron stomach, I am willing to try everything once. It was a very different texture the blubber part was very soft and kind of melty in your mouth while the skin was very thick and chewy. I enjoyed it much more with the skin cut off but I’m sure a couple of tries later, I would get used to the texture. It was no worse than any sushi I have tried.