而且，在鲑鱼生命的早期阶段，大量的北欧河流中的飞虫对小鲑鱼的生存是必要的。
In addition, in the early stages of the salmon's life cycle, a good supply of fly life indigenous to the northern European rivers is necessary for the juvenile salmon, or parr, to survive.
每年鲑鱼卵都会在哥伦比亚河中孵化，小鲑鱼顺流而下进入太平洋，等到成熟后又会逆流而上抚育下一代。
Salmon hatch in its waters, migrate downstream to the Pacific Ocean, and return against the current to breed.
这种小贝类是须鲸、鲑鱼、鲱鱼和各种海鸟的食物。
The little shellfish is eaten by baleen whales, salmon, herring and various seabirds.
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