Maturation studies carried out on Paraplagusia bilineata samples collected from commercial landings from November,2006 to June,2007 showed the dominance of female with male to female ratio of 1:1.78. The Gonado Somatic Index values ranged between 0.2014-0.3416 in male and in case of female, it fluctuated between 0.4997-2.8641. The fecundity ranged from 54,356-2,96,996 eggs with an average of 1,42,053 eggs. Analysis of size at first maturity of Paraplagusia bilineata, using cumulative frequency method showed that female attained first maturity at 173 mm (TL) while the male at 156 mm (TL). The logarithm relationship between fecundity, total length, body weight and ovary weight were also calculated.