A COMPARATIVE HISTOCHEMICAL STUDY OF CALCIUM ABSORPTION IN THREE FRESH WATER TELEOSTS

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Histochemical observations on calcium absorption in the various regions of the intestine of Esomus danricus (Ham.), Clarias batrachus (Linn.) and Channa striatus (Bloch) are given in this paper. The fish were studied at different time intervals after experimentally feeding them on a calcium diet. Three hr after feeding on the calcium diet, no absorption was recorded in these fish except for moderate absorption in the anterior intestine of Esomus danricus. At an interval of six hr, absorption of calcium was recorded in the anterior intestine of all the three fish. However, in Esomus danricus, the middle intestine also showed calcium absorption at this time interval while in the other fish, no absorption was recorded in this region. Nine hr after feeding, maximum absorption was observed in the anterior and middle intestine of Clarias batrachus and Channa striatus and weak absorption was recorded in the middle intestine of Esomus danricus. However, maximum absorption was noted in the pyloric caeca of Channa striatus at this time interval. No absorption was noted in the posterior intestine of all the three fish.