Dams to be built across fish and crab migration routes shall be provided with appropriate fish passage facilities.

在鱼蟹回游通道筑坝，要建造相应的过鱼设施。

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The two dams shut off this week—the Elwha and the Glines Canyon—went online over 100 years ago, despite failing to meet concurrent legal requirements for fish passage.

本周位于尔瓦河与戈兰斯峡谷的两座大坝于已关闭。尽管不符合同时出台的鱼类通道法律标准，这两个大坝已经使用了一百多年。

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In experiments, a blindfolded harbor seal can detect the passage of a fish by using its whiskers to sense changes in flow velocity - even 30 seconds after its prey has passed by.

在试验中，一只被蒙住眼睛的海豹用胡子感应水流速的变化，从而发现鱼游动的路径——即使那猎物是在30秒以前经过那里的。

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In power "emergencies, " however, those fish passage measures can be suspended to allow for additional hydropower generation.

CNN: Energy crisis affects Snake River dam proposal

They say that the federal Fish Passage Center, created by the Northwest Power Planning Council to monitor fish counts and water flows on the Columbia and Snake, has documented a direct correlation between higher flows and salmon survival.

CNN: River watch: Is Columbia tapped out?

The Environment Agency said while the passage of tagged fish over the barrage had been low, it had found the numbers of young salmon upstream had increased, which underlined the complexity of the issue.

BBC: Fears over Tees Barrage impact on fish