The effect of water currents on the movement behaviour of the Oriental River Prawn, Macrobrachium nipponense (De Haan, 1849)

The present study showed the effect of water currents (0.20 – 0.25 m\sec.) on movement behaviour Macrobrachium nipponense during 2 and 24 hour periods inclusive weight group five (g) . In first period, results indicated that one (0.10 0.49 g) aggregated towards or contrary by relative percentage 64.47 & 35.33 % , where as groups were distributed in following sequences : two three four 44 56 40.67 59.33 38 62 respectively But 3.33 96.67 However, second period for 27.33 72.67 22 78 19.33 80.67 13.33 86.67 distribution these age-groups determined at different parts tank