Life history traits of the Monsoon River prawn<i>Macrobrachium malcolmsonii</i>(Milne-Edwards, 1844) (Palaemonidae) in the Ganges (Padma) River, northwestern Bangladesh

The Monsoon River prawn, Macrobrachium malcolmsonii (Milne-Edwards, 1844), is one of the dominant benthic species in the Ganges River. Our study describes some biological parameters including sex ratio, length–frequency distributions (LFD), length–weight relationships (LWR), and relative-condition (Kn ) factor of M. malcolmsonii in the lower part of the Ganges River, northwestern Bangladesh. A total of 502 specimens of the ranges 3.54–11.76 cm total length and 0.50–15.20 g body weight were analyzed in this study. Sampling was done using traditional fishing traps (Kara) during the period from March to October 2010. The overall sex ratio showed no significant differences from the expected value 1:1 (χ 2 = 0.20, p = 0.157), and there was no significant difference in the LFD between…