摘要：

3 Abstract: Berzem; Barbus pectoralis (Cyprinidae) inhabiting Karoon River (Southwest Iran). There wasn't any available report on anatomical and histological analysis of B. pectoralis. So, in this study, the morphologic and microscopic features of spleen as the important lymphatic organ on immune system of B. pectoralis were recognized. A total number of 10 young fish freshly prepared from Karoon River in Khuzestan. After removing the spleen, it was immediately fixed in Bouin's solution and transport to the laboratory. The 5-6 m sections were made using paraffin embedding techniques and stained by Haematoxylin and Eosin (HandE). The spleen as an elongated organ located on the middle part of digestive canal and microscopically was covered by a capsule of connective tissue and an epithelial layer. Spleen included white and red pulps. There are some similarities and some differences between spleen of this species and mammals. Spleen as the biggest and the most important lymphatic organ and microscopically very similar to spleen of mammals has many functions such as lymphatic cell production. Histomorphology of spleen and pancreas show that in B. pectoralis, exocrine part of pancreas is organized inside spleen and like some fishes, splenopancreas structure is present.

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