本书重点讲述了鲑鱼的洄游特性，它们出生在河流，在海里生活，长大后又会回到出生的河里孵卵，这个过程漫长而艰难。本书图解方式真实生动，语言简单有趣；对页大图颜值高，由国际插画师精心绘制。除了纸质图书，还有和伴读讲解，无需家长陪伴，电子老师全程讲解，讲故事，说科普，陪伴孩子掌握科普知识。
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