Abstract
Morphological, histochemical and ultrastructural studies were made of the gastric mucosa of the rainbow trout, a species of teleost fish of economic significance in aquaculture. The cytological features of the columnar cells of the surface epithelium and the glandular cells are described. The former are identifiable by their location and by the shape and distribution of granules which contain neutral and acid mucosubstances, mainly sialomucins. The simple tubular glands are located only in the proximal region of the stomach (corpus), and are formed by a single type of glandular cell. These cells, which contain a well-developed tubulovesicular system and abundant zymogen granules, secrete both hydrochloric acid and protein. The results of this study provide a basis for future research on the influence of diets containing different amounts of carbohydrates and protein.
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