Abstract
Scanning electron microscopy was successfully used for studying some histological alterations observed in two farmed fish of aquacultural interest: the gilthead bream, Sparus auratus, and the sea bass, Dicentrarchus labrax. In the gilthead bream, several types of abnormality were observed in the mid-gut: protuberance of the apical cell surface, multiplication of mucous cells, exulcerations and, in particular, regression of microvilli from the enterocyte surface. In the sea bass, lesions occurred in the olfactory epithelium, with the disappearance of cilia and microvilli of the receptor cells and the agglutination of cilia of the non-receptor cells.
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