Physiochemical Parameter And Plankton Occurance In Liquid Manure Treated Concrete Ponds Stocked With <i>Cyprinus carpio</i> Fry

Abstract

The use of organic manure and effluent is said to be problematic both in agriculture and aquaculture production systems. Therefore the application of liquid manure serves as a more efficient way as it stimulates growth of natural food. This experiment was to determine the water quality and productivity estimate of the ponds, as there is some positive correlation between phytoplankton productivity and fish yield in ponds. Liquid manure was extracted from anaerobically fermented poultry and pig manure. Common carp Cyprinus carpio fry of 0.76g average weight were stocked at 3fish/ m3 rate in replicate and cultured for 100 days while the fish were sampled biweekly. Physiochemical parameters of the ponds were monitored simultaneously. Results showed that water parameters of the ponds during the period after treatment with liquid manure were similar in both treatments. Dissolved oxygen ranged between 6.25-15.76mg/l and 5.4-15.16.51mg/l for Pig and poultry liquid manure, Turbidity was 3800-8950mg/l. and 2300-9400mg/l, PH was 7-9.05 for both treatments while Electrical conductivity was 130-295ms/cm and 140-350ms/cm. Phytoplankton and zooplankton percentage of occurrence were not significantly different with plankton yield of 1,800-811,071.43Kg/ha for Pig and 1,462.50 - 67,178.57Kg/ha for Poultry. The average weight during the culture period was 3.61g and 3.54 for Pig and Poultry treatments respectively. They were not significantly different from each other using t Test {p>0.82}

Keywords: Anaerobic fermentation, Liquid manure, and plankton occurrence

Nigerian Journal of Fisheries Vol. 5 (1) 2008: pp. 9-22