Many migrating Fraser sockeye (both outbound as young smolts and inbound as mature fish) pass some two-dozen salmon farms in the Broughton Archipelago.

许多洄游到Fraser河的红鲑，包括降河洄游的幼鱼和溯河洄游的成鱼，都会经过位于布劳顿群岛的约24个鲑鱼养殖场。

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Bighead and silver carp - both native to Asia - have been migrating toward the lakes since escaping from Deep South fish ponds and sewage treatment plants in the 1970s.

原产于亚洲的大头鲤鱼和银鲤鱼，20世纪70年代从南方鱼塘和污水处理厂逃逸以来，已经向五大湖扩散。

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Our earliest ancestors learnt how to judge when the seasons would change so that crops should be planted, fish would be plentiful, or when migrating herds would pass some local point.

我们的祖先很早就已经知道如何根据季节的变化，预计渔汛的大小、安排庄稼的种植和收割等，甚至能估算迁徙的鸟群过往的时间。

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The construction of the Gezhouba dam in 1981 on the Yangtze river also created a barrier to the migrating fish which further affected fish stocks.

BBC: Earth News - Giant fish 'verges on extinction'

In 1972, on the basis of data on toxicity to fish and migrating birds (but not to humans), the U.S. Environmental Protection Agency banned virtually all uses of DDT.

FORBES: Beyond Copenhagen

The agency says the area, near the Slimbridge Wetland Centre, is of "international importance" for migrating wildfowl, breeding waders, migratory fish and Atlantic eels.

BBC: Work carried out to protect Severn Estuary salt marshes