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Environmental and energy requirements for different production biomass of Nile tilapia(Oreochromis niloticus)in recirculating aquaculture systems(RAS)in Kenya

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Aquaculture and Fisheries 2021年第6期6卷 593-600页

作者： daniel mwendwa wambua Patrick G.Home James M.Raude Stephen Ondimu Department of Soil Water and Environmental EngineeringJomo Kenyatta University of Agriculture and TechnologyP.O.BOX 62000-00200NairobiKenya Department of Agricultural and Biosystems Engineering Jomo Kenyatta University of Agriculture and TechnologyP.O.BOX 62000-00200NairobiKenya

Recirculating Aquaculture Systems(RAS)offers a better option to increase aquaculture production with limited land and water resources while minimizing water *** biggest challenges in RAS is to maintain favorable water quality for the fish to *** practice of RAS in Kenya is minimal with the improper matching of RAS components and production densities for the existing few and in most cases,leading to a system *** study aimed at evaluating environmental and energy requirements for different production biomass of Nile tilapia in a RAS established in a controlled *** production densities and water flow rates were varied while at the same time,the water quality parameters(dissolved oxygen,ammonia,pH,electrical conductivity and temperature)were *** energy consumed for pumping and aeration was also *** stocking biomass varied from 2.3 kg/m^(3) to 10 kg/m^(3) while flow rate was varied from 2.0 L/min and increased at intervals of 1.0 L/min to the maximum attainable flow rate of 10.0 L/*** pumice rock packed in a 1000 L tank and equipped with a bell siphon was used as the *** removal reduced with increasing flow rate with removal rates of 75%at 2.0-3.0 L/min to 9%at 8.0-10.0 L/*** water pH increased with increasing flow rate with R^(2) ranging from 0.4 to *** conductivity increased with flow rate from 112 mg/L to as high as 209 mg/*** oxygen increased with flow rate and ranged from 1.0 mg/L to 7.0 mg/*** consumption increased with flow rate and raged from 0.4 kW h at 2.3 kg/m^(3) stocking biomass to 2.4 kW h at 10 kg/m^(3)stocking *** stocking densities and flow rates resulted to lower purification efficiencies and higher power consumptions than low stocking densities and flow *** order to maintain good RAS water quality,increased production and profits among farmers using RAS in Kenya,there is need to give proper advice on the right combination of st

关键词： Biofilter Flow rate Purification efficiency Stocking biomass Water quality

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