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挪威人捕捞沙丁鱼，抵港时若是活鱼，卖价比死鱼高出许多，所以渔民们千方百计地想让鱼活着抵港。但他们的种种努力都归于失败，只有一艘渔船总能带着活沙丁鱼回到港内。他们的方法很简单：在鱼槽里放进一条鲶鱼。原来，鲶鱼进入鱼槽后，会因环境陌生而四处乱游，挑起摩擦；大量沙丁鱼发现多了一个“异己分子”，自然也会紧张起来，加速游动；这样一来，就能活蹦鲜跳地到达渔港。此现象即为“鲶鱼效应”。
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