a thin silver-coloured American fish that lives in the sea but swims up rivers to produce its eggs and has flesh that can be eaten as a food

The number of American shad left in the bay has been steadily falling. 留在海湾中的美洲鲥鱼数量一直在稳步下降。

The state is trying to reintroduce the American shad to its rivers. 该州正试图将美洲鲥鱼重新引入河流。