Young salmon emerge from the gravel in streams or lakes in spring and then, over various periods of time, migrate to the ocean.
每年春天，幼小的鲑鱼在溪流或湖泊的砂砾中孵化，接著各自经历一段不同的 时间，最后 游向大海。
Many of them will have to migrate to isolated islands in the Southern Ocean.
它们中的大多数将不得不迁移到南大洋的孤岛上。
Salmon hatch in its waters, migrate downstream to the Pacific Ocean, and return against the current to breed.
每年鲑鱼卵都会在哥伦比亚河中孵化，小鲑鱼顺流而下进入太平洋，等到成熟后又会逆流而上抚育下一代。
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