Sweetfish swim in western Japan

Sweetfish swim up Ibo River in Himeji, Hyogo Prefecture, western Japan, on May 5, 2020, to spawn. (Kyodo) ==Kyodo

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People frolic in the sea for a "first swim of the year" event at a beach in the Wakayama Prefecture city of Tanabe, western Japan, on Jan. 2, 2024.

A winter swimmer is swimming in ice water in Changchun, Jilin Province, Northeast China, on December 28, 2023. (Photo by Costfoto/NurPhoto)

A winter swimmer is swimming in ice water in Changchun, Jilin Province, Northeast China, on December 28, 2023. (Photo by Costfoto/NurPhoto)

A winter swimmer is swimming in ice water in Changchun, Jilin Province, Northeast China, on December 28, 2023. (Photo by Costfoto/NurPhoto)

A winter swimmer is swimming in ice water in Changchun, Jilin Province, Northeast China, on December 28, 2023. (Photo by Costfoto/NurPhoto)

A winter swimmer is swimming in ice water in Changchun, Jilin Province, Northeast China, on December 28, 2023. (Photo by Costfoto/NurPhoto)

Swimmers look at a 3-meter-long whale released in a swim area in the Wakayama Prefecture town of Taiji, western Japan, on July 22, 2022.

Swimmers look at a 3-meter-long whale released in a swim area in the Wakayama Prefecture town of Taiji, western Japan, on July 22, 2022.

People frolic in the sea in the Wakayama Prefecture city of Tanabe, western Japan, in a "First Swim of the Year" event on Jan. 2, 2021.

Sweetfish swim up Ibo River in Himeji, Hyogo Prefecture, western Japan, on May 5, 2020, to spawn. (Kyodo) ==Kyodo