鱼梯是帮助鱼儿上溯回游的一种构造，有些鱼儿喜欢在水温较低的上游地区产卵繁殖，因此只要到了繁殖季节，鱼儿便纷纷上溯回游产卵。
游览西雅图市中心三文鱼梯水闸及太空针塔，接著送往温哥华之酒店休息。
And hira mm . chittenden locks , fish ladder space needle etc . admission not included.
还有儿童互动的游戏间、鲑鱼鱼梯和孵卵的地方，以及四百多品种的水族。
There is a children's interactive play room, a salmon ladder and fish hatchery, and more than 400 species of sea life.
一些大坝和这两座埃尔瓦河大坝一样在建造的时候缺乏鱼梯设计，就是说它们完全阻碍了鱼群的洄游。
Some, like the two Elwha dams, were built without fish ladders, meaning they serve as completely impenetrable barriers to fish migrations.
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