RECYCLING OF USED WATER FOR THE SEED PRODUCTION OF MACROBRACHIUM MALCOLMSONII (H. MILNE EDWARDS)
D. R. Kanaujia, A.N. Mohanty, K. M. Das-1998
Journal of Aquaculture in the Tropics 13(3): 223-232
Abstract:
Success in hatchery production of Macrobrachium malcomsonii seed using an air-lift biofilter recirculatory system and a brackishwater medium of 18-20 ppt salinity is reported. Brackishwater of desired salinity, being essential for freshwater prawn hatcheries, is generally prepared by dilution of seawater. But the transportation of seawater to inland hatcheries is costly in terms of labour and time. Therefore the prospects for recycling hatchery wastewater during seed production of Macrobrachium malcolmsonii were investigated in an experiment using an air-lift recirculatory system in which the used water was subjected to aging and chemical treatment. The results showed a production of 15-25 post-larvae/litre (PL/1) in reused medium at temperatures ranging from 28 tot 30.5 C with no significant variation over the conventional media. The physico-chemical characteristics of the media used are described.
(Central Institute of Freshwater Aquaculture, Kausalyaganga, Via. Bhubaneswar 751002 (Orissa), India)