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The skin structure and the plasma cortisol levels of trout, , were examined during 7 days of exposure to water of pH 5. By day-4 and-7, the thickness of the epidermis was significantly (<0.05) less in acid exposed fish than in controls, and degenerative cells were common in the upper epidermal layers. Many epidermal cells exhibited signs of necrosis, and by day-7 many apoptotic cells were also present. Secretory vesicles of high electron density were abundant in the filament cells of the 3–4 outermost layers of epidermis, and intercellular spaces had increased. Mitotic figures occureed throughout the epidermis, with the exception of the outermost cell layer. Mucous cells became elongated after day-1, and later, newly differentiating mucous cells could be seen close to the skin surface, and many mucocytes contained mucosomes of high electron density. Rodlet cells were occasionally seen. Chloride cells appeared similar to those of control fish. Many leucocytes, mainly macrophages and lymphocytes, had penetrated the epidermis via the highly undulating basal lamina, and at day-7, numerous apoptotic lymphocytes were found. In the dermis, melanosomes became dispersed in the cytoplasmic extensions of melanocytes which were present in the epidermis of all acid-exposed fish. Iridocytes were rate after day-4, while fibroblasts were abundant and secreted large amounts of collagen. After 1 day of exposure to acidified water, a significant (<0.05) elevation of the plasma cortisol level had occurred, but this subsequently declined, and had returned to control values by day-7. The changes in skin structure, however, remained throughout the whole exposure period.

Cellular responses of the skin and changes in plasma cortisol levels of trout (Oncorhynchus mykiss) exposed to acidified water