The present study was conducted to know gender ratios of prawns and shrimps from U-To Creek of Chaungtha, Pathein Township, Ayeyawady Region from January to December 2017. Samples of prawn and shrimp were collected from monthly visit (three consecutive days / month). From the monthly collection of females and males, twenty subsamples of each species were randomly taken from fisherman. Genders were determined as males, females and ovigerous females. A total of 14 species belonging to five genera under three families were recorded. Male, female and ovigerous female proportion of different species were different seasonally in the catches. Highly significant catch weight of female was recorded more than male.

Keywords : Prawns and Shrimps; Overall Sex Ratio; Ovigerous Females.