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(190427) -- BEIJING, April 27, 2019 (Xinhua) -- Fishes jump upstream at the Venta Rapid, a wide waterfall on the Venta River in Kuldiga, Latvia, April 26, 2019. Every spring, a scene of flying fishes is seen at the waterfall. Going up the stream for breeding, the fishes need to jump over and over again until they can finally continue their way upstream. (Xinhua/Janis Laizans)