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This study reports on the effect of organic (sheep and cow manure), and chemical fertilizers, on the phytoplankton, primary productivity and aquaculture production in the cultivation of carp in semi-inten sive earthen ponds. The average biomass final (kg) were 1687.4, 1948.8 and 2370.6 k g / fed. in T1, T2 and T3, respectively. Treatment with chemical fertilizers w as found to present the highest yield with 11.57 ± 0.67 kg/fed./day. It was followe d by treatment with cow manure (9.20 ± 1.24 kg/fed./day) and sheep manure (7.79 ± 1.95 kg/fed./day). Concentrations of phytoplankton were significantly (p 0.05), were within the acceptable ran ge during the present study. In general, conditions were adequate to obtain hi gh yields without the commercial feed, therefore organic fertilizers appl ication can be recommended, due to its availability and low costs.

Effect of organic and chemical fertilization on growth performance,phytoplankton biomass and fish production in carp polyculture system