Comparative histological study of the alimentary canal of the Silver carp (Hypophthalmichthys molitrix) in three different habitats

گنجى پناهى, پروانه and معصومى, دكتر لطفعلى and بانان خجسته, دكتر سيد مهدى and حسن زاده, مهندس فرشاد (2010) Comparative histological study of the alimentary canal of the Silver carp (Hypophthalmichthys molitrix) in three different habitats. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

Silver carp, hypophthalmychthys molitrix (Valenciennes), belonging to the family Cyprinidae, is a fresh-water fish. Silver carp is habiting coast of rivers of Asia-Pacific from the Amur River in north to the Pearl river in south of China. In Iran, its distribiution is in the Anzali lagoon and White river. This fish lives in superficial parts of water that is usually rich in plankton, because of its special food habits feeding on phytoplankton. Thirty fish were collected from culture ponds of three different habitats (Namin city, around Tehran and Shiraz city). Staining was performed with hematoxylin – eosin (H& E) for general histology. Studies were performed by using light microscopy. In this study, histological properties of the digestive tract consisting of buccal cavity, pharynx, esophagus and intestine –not stomach– in silver carp (Hypophthalmichthys molitrix) were examined. Microscopic observations showed that: The wall of the buccal cavity and pharynx is composed of mucosa and submucosa. No muscularis mucosae were observed in the alimentary tract except intestine. The buccal cavity and pharyngeal mucosa are lined with a nonsqoumus stratified epithelium. The intestinal epithelium consisted of simple columnar cells. Mucus cells were observed in pharynx, esophagus and intestine. Taste buds were just observed in the pharynx. The mucosal surface of pharynx, esophagus and intestine is folded. The intestine and esophagus was composed of four layers: mucosa, submucosa, muscularis and adventitia in the esophagus, serosa in the intestine. The muscularis layer in the intestine was organized in inner circular and outer longitudinal smooth muscle layers while in the esophagus was organized in inner longitudinal and outer circular skeletal muscle layers. Nervous glands were observed between these layers in the intestine. Mucosal tubular glands, crypt and pyloric caeca were not observed in the intestine. No morphological and histological differences were observed between fish of three habitats.

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