SEX- RATIO STRUCTURE OF Puntius ticto IN SPRING FED RIVER AASAN FROM DISTRICT-DEHRADUN, UTTARAKHAND, INDIA

The present study was conducted to assess the sex ratio of the fish, Puntius ticto in the spring fed river Aasan in western Doon valley for a period of one year. Being an economically important but ignored species, its sex ratio assessment will help in understanding its occurrence and abundance in this area. During the study a total of 109 individuals were collected and their sex determined. In monthly study, the sex ratio varied from 1.66 male:1.00 female in the month of June to 1.00 male:1.60 female in the month of July, whereas in seasonal study it was recorded highest in spring season as 1.22 male:1.0 female and lowest in monsoon season as 1.00 male:1.56 female.