Hydroelectric power because in destroys the river basin and has a negative effect on fish migration.

水力发电因为破坏了流域和对鱼类的迁移有负面影响。

youdao

One commission study concluded the dam would affect fish migration and could drive endangered species, like the Mekong giant catfish, to extinction.

委员会的一份研究断定，大坝将会影响鱼类的回游，并可能加速诸如湄公河巨型鲶鱼这类濒危物种的灭绝。

youdao

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。

youdao

But fisheries experts say plans by Cambodia,Laos and Thailand to build hydropower dams on the Mekong would block fish migration, threatening already endangered species.

VOA: standard.2010.01.11

Many dams on the list impeded fish migration and degraded water quality.

CNN: Study opens floodgates on dam removal

Similarly, the elimination of Sandstone Dam on the Kettle River in Minnesota opened 30 miles for fish migration and revived recreation in the area.

CNN: Study opens floodgates on dam removal

According to experts, the reason behind the eel's decline largely remains a mystery due to the difficulty in tracking the fish during its migration.

BBC: River ladders give eels a leg up