The effect of chemical and organic fertilization on Phytoplankton and fish production in carp (Cyprinidae) polyculture system

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This study reports the effects of sheep and pig liquid manure, and chemical fertilizer on the phytoplankton, primary productivity and aquaculture production in the cultivation of carp in semi-rustic ponds. The total yield was 4.632 kg in two hectares. Treatment with chemical fertilizers was found to present the highest yield with 10.06 ± 0.67 (kg/Ha/day), followed by treatment with pig manure (8.27± 1.24 kg/Ha/day) and sheep manure (6.33 ±1.95 kg/Ha/day). It was also found that concentrations of phytoplankton were significantly (p<0.05) higher in ponds fertilized with sheep and pig manure (945.940 and 1,157,706 cells/ml, respectively) than in ponds where chemical fertilizer was used (744.560 cells/ml). In general, conditions were adequate to obtain high yields without commercial feed, thus organic fertilizer application can be recommended because ofits availability and low cost.

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