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Journal of Fisheries and Aquatic Science
Year: 2008  |  Volume: 3  |  Issue: 1  |  Page No.: 47 - 53

Effect of Unilateral Eyestalk Ablation and Diets on the Growth of Freshwater Prawn Juveniles of Macrobrachium malcolmsonii (H. Milne Edwards)

P. Soundarapandian    

Abstract: Effect of unilateral eyestalk ablation and diets on the growth of the juveniles of Macrobrachium malcolmsonii was studied. Weight gain of the eyestalk ablated juveniles fed with live foods, adult Artemia (8.41 g), earthworm (6.90 g) and oyster (6.54 g) was better than those fed with artificial feed I (5.18 g). Both in eyestalk ablated and intact control animals, adult Artemia induced higher weight gain; whereas the animals fed with artificial feed I showed the lowest weight gain. Feed consumption was higher when eyestalk ablated animals were fed with earthworm (13.92 g) and artificial feed II (13.73 g) than those feed with artificial feed I (11.63 g) and adult Artemia (12.12 g). However, feed consumption did not showed significant difference when eyestalk ablated animal fed with earthworm, feed II and oyster. The intact control animals consumed more earthworm (11.68 g) than oyster (10.51 g), adult Artemia (10.32 g) and artificial feed I (9.28 g). The eyestalk ablated prawns which were fed with adult Artemia showed the best FCR value (1.48) followed by oyster (2.02), earthworm (2.05) and artificial feeds I (2.38) and II (2.42). Similar pattern was evident in intact control prawns. The eyestalk-ablated animals fed with adult Artemia showed higher survival (75.6%) than those fed with earthworm (73.6%), oyster (72.8%), artificial feeds II (69.6%) and I (68.6%). Similar pattern was also observed in intact control juveniles. The present study clearly indicates that unilateral eyestalk ablation can be adapted in aquaculture practices of M. malcolmsonii juveniles as it yields high weight gain within a short period when compared to intact controls.

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