Histological study of alimentary canal in Binni (Mesopotamichthys sharpeyi) during the early developmental stages

Document Type : Research Paper


1 Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran

2 Department of Fisheries, Faculty of Environment and Natural Resources, Khatam Alanbia University of Technology, Behbahan, Khuzistan, Iran


Study of fishes’ alimentary canal ontogeny is important to understand their nutritional requirements during their early development and is a research priority for candidate species in aquaculture. Therefore, this work was conducted to study the early development of the Binni fish’s (Mesopotamichthys sharpeyi) alimentary canalusing histological method. A total of 200 larvae and fry were sampled from hatching up to 41 day post hatching (DPH), and then histological sections were prepared using paraffin method and staining with hematoxylin-eosin. Based on the results, mouth opening, exogenous feeding and the esophagus development covered with a cuboid epithelium were happened on 3 DPH, and the emergence of the gill arches on the 4 DPH. The complete absorption of the yolk sacs was lasted until the 4 DPH. The developmental characteristics of Binni fish during its early stages indicated the concurrence of biological structures with their needs. In addition, these ontogenic changes were similar to those of other cyprinid’s digestive system.