Length-weight relationship and relative condition factor of carps Labeo bata and Labeo rohita from Kulia beel (wetland) of Nadia district of West Bengal

An investigation was carried out to study length-weight and relative condition factor of two carps such as Labeo bata and Labeo rohita occurring in a wetland called Kulia beel, a closed beel adjacent to the Ganga river basin in the Nadia district of West Bengal. The study was based on 197 samples of Labeo bata with size ranged from 180 to 240 mm and 165 samples of L. rohita with size ranged from 180 to 280 mm in total length for a period of 9 months (March to November). The length-weight relationship was recorded W = 0.0171 L2.904 and W = 0.0179L2.890 for bata and rohu respectively. The monthly mean Kn values varied from 0.907 to 1.076 and 0.959 to 1.012 for the species Labeo bata and L. rohita respectively.