The economics of trickling biological periwinkle shell filter for closed recirculating catfish system
Studies on the economics of trickling biological periwinkle shells filter for closed recirculating catfish system was carried out at the University of Science and Technology, Port Harcourt, Nigeria for 12 weeks. The periwinkle shells biofilter and other recirculating aquaculture system (RAS) components were designed and set up for a pilot catfish production using Clarias gariepinus juveniles at the stocking density of 400 fish/m3. Using fish holding tank volume of 3 m3, biofilter volume of 1m3, sedimentation tank volume and flow rate of 4.20m3 and 0.78m3/hr respectively, lift pump flow rate of 2.10m3/hr, and an annual production of 3 tons of catfish, a record of all financial expenditures was kept. The financial analyses of the system with periwinkle shells filter and that of imported plastic filter block of same size were prepared. The discounted cash flow projections for the two systems were also prepared. From the discounted cash flows, the economic viability indices for the two systems were computed. The economic analysis compared the profitability index of 1.45 and the pay back period of 2.50 years for the system with periwinkle shells filter to the profitability index of 0.60 and pay back period of 5.90 years for the imported plastic filter block, and concluded that the system with periwinkle shell filter was cheaper and more cost effective.
| Main Authors: | , , , |
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| Format: | conference_item biblioteca |
| Language: | English |
| Published: |
Fisheries Society of nigeria
2010
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| Subjects: | Aquaculture, Nigeria, Port Harcourt, Aquaculture recirculatory system, freshwater environment, Economic analysis, Economic benefits, Biofilters, |
| Online Access: | http://hdl.handle.net/1834/38203 |
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| Summary: | Studies on the economics of trickling biological periwinkle shells filter for closed recirculating catfish system was carried out at the University of Science and Technology, Port Harcourt, Nigeria for 12 weeks. The periwinkle shells biofilter and other recirculating aquaculture system (RAS) components were designed and set up for a pilot catfish production using Clarias gariepinus juveniles at the stocking density of 400 fish/m3. Using fish holding tank volume of 3 m3, biofilter volume of 1m3, sedimentation tank volume and flow rate of 4.20m3 and 0.78m3/hr respectively, lift pump flow rate of 2.10m3/hr, and an annual production of 3 tons of catfish, a record of all financial expenditures was kept. The financial analyses of the system with periwinkle shells filter and that of imported plastic filter block of same size were prepared. The discounted cash flow projections for the two systems were also prepared. From the discounted cash flows, the economic viability indices for the two systems were computed. The economic analysis compared the profitability index of 1.45 and the pay back period of 2.50 years for the system with periwinkle shells filter to the profitability index of 0.60 and pay back period of 5.90 years for the imported plastic filter block, and concluded that the system with periwinkle shell filter was cheaper and more cost effective. |
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