<p><span style=\"line-height: 115%; font-family: \'Times New Roman\',\'serif\'; font-size: 10pt;\" lang=\"EN-US\">Bangladesh is very much rich in small indigenous fish diversity which have tremendous role in protein uptake,eradicate male nutrition and proverty,influence the livelihood of the rural people and also to play contribution in national economy. Rivers are the natural habitat of fishes and other plants and animals. Ecological functioning is successfully run by the interaction of biotic and abiotic components.Due to pollution, over exploitation and climatechange, the rivers have lost their productivity<span style=\"mso-spacerun: yes;\">&nbsp; </span>affecting the fish diversity over the two or three decades.For this, it is necessary to construct the diversity of small indigenous fishes and todetect the status of fishes of this two important rivers.</span></p>