Effect of salinity on carrying capacity of adult Nile tilapia Oreochromis niloticus L. in recirculating systems |
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| Authors: | M A Kabir Chowdhury,Yang Yi,C K Lin,& E R El-Haroun |
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| Affiliation: | Aquaculture and Aquatic Resource Management Program, Asian Institute of Technology, Pathumthani, Thailand 12120; Fish Nutrition Research Laboratory, Animal and Poultry Science, University of Guelph, Guelph, ON, Canada; World Fish Center, Jalan Batu Maung, Penang, Malaysia |
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| Abstract: | Effect of salinity on carrying capacity of a recirculation system for Nile tilapia, Oreochromis niloticus L.; production was assessed. Survival, growth and feed conversion ratio of adult Nile tilapia fed 30% crude protein diet for 88 days were measured at three different salinity levels (8, 15 and 25 g L?1) and two stocking densities (20 and 40 m?3) in three independent recirculating systems. Highest survival (98%) and a linear growth in net biomass (P<0.01) was observed in both densities at 8 g L?1 and in 20 m?3 treatment at 15 g L?1. Highest net biomass growth was observed in the 40 m?3 stocking density treatment at 8 g L?1 salinity level (P<0.05). Overall biomass growth was significantly affected by salinity indicating a decrease in Nile tilapia carrying capacity with increased salinity. About 11 000 kg ha?1 crop?1 of Nile tilapia can be obtained in recirculating systems at 8 g L?1 salinity, significantly higher than the net production at 15 g L?1 (5200 kg ha?1 crop?1) and 22 g L?1 (4425 kg ha?1 crop?1). |
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| Keywords: | Nile tilapia salinity tolerance biomass carrying capacity survival recirculating system |
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