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Use of sewage in split doses to enhance water productivity for fish culture

Aquaculture and Fisheries 2021年第6期6卷 609-616页

作者： Rathindranath Mandal Arabinda Das Debnarayan Chattopadhyay Ajmal Hussan subhendu adhikari Baidyanath Paul Farhana Hoque Parthapratim Chakrabarti Bindu R.Pillai Regional Research Centre ICAR-Central Institute of Freshwater AquacultureRaharaKolkata700118West BengalIndia ICAR-Central Institute of Freshwater Aquaculture Bhubaneswar751002OdishaIndia

The problem of sewage disposal has received great attention *** raw sewage contains a variety of high inorganic and organic matters that affect natural water *** mitigate such problem,sewage may be recycled through aquaculture *** recycling in aquaculture enhances water productivity through nutrients *** loading of sewage ensures viable aquaculture;otherwise,fish mortality occurs due to poor water *** optimize sewage application,two different experiments were conducted,each with four *** both experiments,three fish species namely rohu(Labeo rohita Hamilton,1822),mrigal(Cirrhinus mrigala Hamilton,1822),and bata(Labeo bata Hamilton,1822)were tested in triplicate in FRP(Fibre-Reinforced Plastic)*** sewage concentrations(0,25%,50%and 75%)used in first experiment were prepared by mixing freshwater,showing Biochemical Oxygen Demand(BOD)2.0±0.4 mg/L,10.8±1.4 mg/L,19.6±1.5 mg/L and 41.6±2.58 mg/L,*** 30 days rearing,results showed≥75%fish survival in sewage concentrations up to 50%with BOD level 19.6±1.5 mg/*** than 50%fish survived in 75%sewage concentration,with BOD level as 41.6±2.58 mg/*** second experiment was conducted for 90 days considering 50%sewage concentration as basal dose with BOD level as 19.6 mg/L as an acceptable limit for fish *** doses of sewage were applied in T_(1),T_(2) and T_(3) treatments fortnightly,weekly and semi-weekly intervals,while single dose was used in C(control)*** of split doses resulted better hydro-biological changes,including nutrients recovery,in T_(1),T_(2) and T_(3) than that of single dose in *** growth plotted with net primary productivity(NPP),phytoplankton and zooplankton densities exhibited positive correlations in T_(2)(12 doses)and T_(3)(24 doses),considered as optimal doses to ensure better water productivity for desirable fish production than sewage with single dose or limited doses(6 doses).

关键词： Sewage Split dose Water productivity Fish rearing

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