两种规格的鱼 怎翻译?two specifications对吗

fish of two different sizes；有道词典上specification的解释：specification [ ,spesifi'keiʃən ]
n.a detailed description of design criteria for a piece of work
同义词：x05x05x05x05x05x05x05x05 x05x05x05x05 spec
naming explicitly(patent law) a document drawn up by the applicant for a patent of invention that provides an explicit and detailed description of the nature and use of an inventiona restriction that is insisted upon as a condition for an agreement
同义词：x05x05x05x05x05x05x05x05 x05x05x05x05 stipulation
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