Histochemistry and the structure of the skin of a murrel, Channa striata (Bloch, 1797) (Channiformes, Channidae). II. Dermis and subcutis

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Abstract
The structure and the cytochemistry of the dermis and the subcutis of Channa striata, which buries in mud to survive droughts, is described and correlated with its habitat. The dermis consists of an outer stratum laxum and an inner stratum compactum. The stratum laxum is mainly composed of well-developed scales lodged in connective tissue pockets which are characterized by the presence of huge deposits of lipids. These lipids may play important roles: in supplying energy during the period of fasting, acting as a barrier for water diffusion through the skin, and serving as shock absorbers, protecting the body from mechanical injury during burrowing. The presence of sulfated acid-mucopolysaccharides, the substantia amorpha in the stratum laxum, has been described as an adaptation to prevent desiccation. Alkaline phosphatase, sulfated acid-mucopolysaccharides, and calcium are closely associated in the osseous layer of the scales and probably play an important role in calcification. Numerous fine collagen fiber strands connecting the basement membrane to the scales provide firm attachment of the epidermis to the dermis. The presence of a relatively thin subcutis may be correlated with the well-developed layer of fat cells in the stratum laxum.

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