Fish epidermis and amphibian epidermis

How dissimilar is the fish epidermis from amphibian epidermis?

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The fish epidermis is extremely thin and comprises mucus-secreting cells. The fish skin doesn’t present keratin. The mucus consists of a protective function and it as well helps the sliding of the animal below water. (That is, the fish scales originate from the dermis and not from epidermis.)

In amphibians, there is already a slight keratinization of skin, probably an additional adaptation to the terrestrial atmosphere. Amphibians contain smooth and wet epidermis with no scales. Such features facilitate their cutaneous respiration.

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