由于北极的大片浮冰向南移动，挪威人的航行路线由向西航行改成了向开阔的大西洋航行，后来向西的航行整个都终止了。
As the Arctic ice pack spread southward, Norse voyages to the west were rerouted into the open Atlantic, then ended altogether.
有的Fraser河鲑鱼的洄游路线是一路向南，绕过温哥华岛，那里还没有建立渔场，就没有出现寄生虫感染。
Fraser salmon that take the southern route around Vancouver Island, where there is no gauntlet of fish farms to run, do not display these infections.
有的Fraser河鲑鱼的洄游路线是一路向南，绕过温哥华岛，那里还没有建立渔场，就没有出现寄生虫感染。
Fraser salmon that take the southern route around Vancouver Island, where there is no gauntlet of fish farms to run, do not display these infections.
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