Ecological Status of River Daha in North Bihar and its Effects on Fish Diversity

The paper deals with the ecological studies of River Daha in north Bihar in relation to its physico-chemical charactersitics and the fish fauna. The fish fauna is greatly affected by the characteristics of water and level of pollution. The reiver is periodically gets much polluted due to discharge of sugar factories wastes and distilley effluents as reflected by low dissolved oxygen, high BOD and COD values and low pH. In all, 32 species of fish belonging to 7 Orders, 15 Families and 19 Genera were reported from the river. Many of these species come in the category of hardy fishes reflecting their tolerance to polluted conditions.