The International Council for the Exploration of the Sea (ICES), which gives scientific advice on sustainable fishing, said that in recent years, mackerel has been overfished due to a lack of international quota agreements. As a result there is not a high enough rate of breeding to replace the volume being caught.
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对比观察这三胎小鼠，科学家们还发现，小鼠宝宝的“性格”也在悄悄发生改变。