The Otaru Aquarium in Hokkaido, Japan, announced that a three-year-old male Wandering Seal named 'Mizore', who was raised through complete artificial rearing, has passed away. Mizore was born in April 2021 at the Osaka Aquarium Kaiyukan, where he was separated from his mother due to low body temperature and raised by caretakers. He was later transferred to the Otaru Aquarium in November 2023 and gained popularity among fans on social media. The cause of death is currently being investigated, and the Otaru Aquarium expresses its commitment to improving breeding techniques in the future.