1. Scientists have studied the migration of fish over long distances. 
   科学家研究过鱼类远距离回游的现象。
2. Scientists have studied the migration of fish over long distances in the river. 
   科学家研究过江中的鱼类远距离回游的现象。
3. 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。
4. bony flesh of herring-like fish usually caught during their migration to fresh water for spawning; especially of Atlantic coast. 
   鲱鱼般的瘦骨嶙峋的鱼，通常在迁徙到淡水产卵时被捕获；尤其在大西洋海岸。
5. (2) "Fishing areas" means spawning grounds, feeding grounds, wintering grounds and migration channels of fish and shrimp as well as aquacultural grounds of fish, shrimp, shellfish and aquatic plants. 
   (二)"渔业水域"是指鱼虾类的产卵场、索饵场、越冬场、回游通道和鱼虾贝藻类的养殖场。

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