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Study on the Respiratory Organ of Spined Loach, Iksookimia longicorpa (Pisces, Cobitidae), in Relation to the Air-breathing System  

Park, Jong-Young (Faculty of Biological Sciences and Korean Institute for Biodiversity Research, Chonbuk National University)
Publication Information
Korean Journal of Ichthyology / v.17, no.4, 2005 , pp. 241-247 More about this Journal
Abstract
To observe the respiratory system in relation to the air-breathing organ in Iksookimia longicorpa, micro-anatomical investigation was performed on the epidermis and on intestinal tract fragments. The epidermis was distinguished by two types of skin glands, a small mucous cell and a large club cell. The mucous cell was acid sulfomucins (some sialomucins), but the club cell did not give any histochemical tests for mucosubstances. The presence of a well defined lymphatic system with small lymphocytes was established in the stratum germinativum layer of the epidermis. A large number of blood capillaries run very close to each other just below the basement membrane. The straight intestinal tract is divided into an intestine and rectum, which consisted of a mucosa (epithelial layer), lamina propria-submucosa, muscularis, and serosa. The intestine and rectum have shorter mucosal folds and a thinner wall. The majority of the epithelial mucous cells contain acid sulfomucines. Based on the above results, I. longicorpa adapts to poor dissolved oxygen conditions by using an additional respiratory system using air through the epidermis, not the intestines.
Keywords
skin; acidic sulfomucins; mucous cell; club cell; intestine; Iksookimia longicorpa;
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