These dams blocked access to upstream spawning beds for six species of salmon on what once was one of the most productive salmonrivers in the world.
这些水坝阻断了6种鲑鱼的上游产卵地，而这条河曾是世界上鲑鱼产量最高的河流之一。
2
Salmon also carry dangerous chemicals as the fish migrate between rivers and the sea.
鲑鱼在河流和海洋之间迁徙时也会携带危险的化学物质。
3
The parks already attract specialist visitors, including mountaineers, who come to climb the technically difficult peaks, and fishermen, lured by the salmon and trout in the region's rivers.