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| Stannius corpuscles (SC) are unique endocrine gland in the kidney of bony fish. It plays an important role in regulating calcium haemostasis via secretion of hypocalcine (stanniocalcin) hormone. The structure of Stannius corpuscles has been clarified in several fish species; however, little was elucidated concerning that in African catfish (Clarias gariepinus). Therefore, the aim of the current study is to reveal the structural characteristics of SC in African catfish (Clarias gariepinus) among both sexes. Histological and ultrastructural examinations of SC were revealed among both sexes. The SC were paired, oval white colored bodies embedded in the trunk area of posterior kidneys. Histologically, the SC were surrounded by thin connective tissue (C.T) capsule from which many septa were extended dividing the glands into incomplete lobules. The parenchymal cells consist of two types; one with intensely eosinophilic cytoplasm and the other were weakly stained. Interestingly, the proportion of cells was varied among male and female. The female showed significant higher percentage of lightly eosinophilic cells than the intensely stained cells. On the other hand, the predominant cell type in male was the intensely stained one. Transmission electron microscopic observations revealed the presence of two types of cells; predominant type I (electron dense and electron lucent cells) and type II. The former showed more secretory granules than the later. In conclusion, our results revealed sexual differences in the proportion of cells and suggested that the type I could be responsible for hypocalcine hormone secretion. However, further investigations are required to reveal the structure of SC among different seasons.

Stannius Corpuscles in African Catfish (Clarias gariepinus): Histological and Ultrastructure Studies