A school of dace swims upstream in the Namdae Stream in Gangneung, a coastal town in Gangwon Province, northeastern South Korea, on April 25, 2023. The river fish, called "hwangeo" in Korean, live most of their lives in the sea after being born in a river, and return to the river to lay eggs in March and April. (Yonhap) 

 

Photos by Yoo Hyung-jae

 

[Yoo Hyung-jae, who took these pictures, is a photo reporter at Yonhap News Agency who specializes in the ecological field.]

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