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| Histological Observation of Digestive System of Japanese Crab Charybdis j aponica |
| WANG Ling,GENG Jimei,LIU Yanhua,GUO Enmian |
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Abstract To establish artificial breeding mode and exploit palatable feeds in production of Japanese crab Charybdis j aponica ,histostructure of its digestive system was studied by paraffin method and H · E dye technology .The digestive system of C .j aponica was composed of digestive tract and digestive gland .The digestive tract was consisted of mouth ,esophagus ,stomach ,midgut ,hindgut and anus ,and histostruc‐ture of digestive tract wall was divided into four layers from inside to outside ,namely the mucosa ,submu‐cosa ,muscular layer and adventitia .Abundant esophageal glands secreting mucus to help animals swallow food were found in esophageal submucosa .The setae or bone plates in chitin covered over epithelial layer of cardiac stomach played a role in grinding food .T he chitin layer in pyloric stomach converted into dense‐ly packed setae by which large food particles were blocked into the midgut .There was no chitin layer cov‐ering over the intestinal epithelium .Striated border of the epithelial cells took participate in the absorption of food .Digestive glands also named as hepatopancreas were complex tubular glands and made up of many small liver tubes .The mucosa epithelium of liver tube was composed of a single layer of columnar cells which were divided into four types :absorptive cell ,secretary cell ,fiber cell and embryonic cell .
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Received: 25 March 2016
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