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The giant freshwater prawn, Macrobrachium rosenbergiiis one of the most common decapod species,and now getting more attention from the aquaculturistsworld wide due to its high market demand. Itis commercially important because of its size as wellas its eating flesh qualities. The breeding behaviour,reproduction and hatching of this species wereobserved for about 8 months during 2009.Juveniles (0.55 ± 0.177 g total weight and2.7 ± 0.12 cm, total length) were reared inrounded fibre glass tanks (1.3 m, diameter). Prematingmoult occurs in prawns once the ovariesripen in their carapace cavity so as to transform theprawn into berried stage. Recorded incubation periodranged from 18 to 24 days. The number of eggsranged from 2050 to 150 500 and the fecundityranged from 435.2 to 3849.1 eggs. Number ofhatched larvae ranged from 1825 to 123 410 larvaefor females of 4.71 to 39.1 g respectively. Thenumber of eggs carried by female prawn wasdirectly proportional to its body weight (no. ofeggs = 3441.3 wt. of female – 32 292, r2 = 0.819).(fecundity = 82.066 wt. of female 235.04, r2= 0.7779; fecundity = 317.86 length of female 2651, r2 = 0.833). Hatching rate ranged from 65%to 91%, and there was a correlation betweennumber of hatched larvae and size of female parent(no. of larvae = 10 369 length of female –102 965, r2 = 0.8159; no. of larvae = 2792.9 wt.of female – 26 268, r2 = 0.829). This studycan greatly help in the management strategies ofprawn hatcheries and improve its hatchingtechnology.
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