鱼类的洄游是鱼类在一年或一生中所进行的周期性定向往返移动。洄游性的海洋鱼类完全在海中生活和洄游。同种鱼往往分为若干种群，每一种群有各自的洄游路线，彼此间不相混合。
但是，由于作为研究对象的鱼类洄游于上述两个海域之间，于是问题也就产生了：捕鱼活动在部分海域的减少，对鱼类数目的影响究竟有多大。
The fish species in question, however, migrate between these two areas, so the question was how much the reduction of fishing effort in part of their range would affect their Numbers.
但有一点是显而易见的：停止捕鱼活动（即便只持续六年时间）对于洄游鱼类的影响，与对于非洄游鱼类的影响同样大。
But one lesson is clear. Laying off, even for just six years, has as big an effect on migratory fish as it does on sedentary ones.
鳗是一个典型的洄游鱼类，一些在海上的生活时间。
Lamprey is a typical migratory fish, some time in the sea of life.
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