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This is the world's largest fresh water fish migration.
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This is the world's largest fresh water fish migration. 这是世界上规模最大的淡水鱼洄游

Across the northern hemisphere salmon, returning from the ocean to their spawning grounds,
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Across the northern hemisphere salmon, returning from the ocean to their spawning grounds, 鲑鱼穿越整个北半球 从海洋回到它们的产卵地

Pickings are usually thin for the salamanders,
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Pickings are usually thin for the salamanders, 大鲵的收获通常都比较少

but every year some of the world's high rivers are crowded by millions of visitors.
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but every year some of the world's high rivers are crowded by millions of visitors. 而世界上的高山河流每年都将 迎接成千上万的来访者

The fish they hunt are scarce
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The fish they hunt are scarce 可供大鲵捕食的鱼非常稀少

detect the slightest changes in water pressure.
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detect the slightest changes in water pressure. 能觉察出最轻微的水压变化

But with the spring melt here in Japan
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But with the spring melt here in Japan 可是在日本 每当春雪消融之际

They're the only large predator in these icy waters.
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They're the only large predator in these icy waters. 它们是这些冰水中唯一的大型掠食动物

There are advantages to life in the fast stream -
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There are advantages to life in the fast stream - 这些动物拥有在急流中生存的先天优势

has bushy gills to extract oxygen from the current.
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has bushy gills to extract oxygen from the current. 并依靠浓密的鳃从水中过滤氧气