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本册讲述了地球上最古老的脊椎动物的起源、演化和特点。所有的鱼类都可以分成两大部分：软骨鱼类和硬骨鱼类。本册描述了近2.6万种鱼，其中2.4万多种属于硬骨鱼类。在这本书中，读者将看到凶恶嗜血的鲨鱼，在温暖的浅水中自在遨游的鳐鱼，还有盲鳗、七鳃鳗......它们都是软骨鱼类。
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