Variation in the Water Quality of Organic and Conventional Shrimp Ponds in a Coastal Environment from Eastern China

X. BIAO, L. TINGYOU, W. XIPEI2 and Q. YI1
1 School of Geography Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210046, P. R. China
2 College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, P.R. China

Abstract

X. BIAO, L. TINGYOU, W. XIPEI and Q. YI, 2009. Variation in the water quality of organic and conventional shrimp ponds in a coastal environment from Eastern China. Bulg. J. Agric. Sci., 15: 47-59

Eleven water quality variables were measured at intervals in organic and conventional shrimp ponds during the production cycle (April – August 2002, a 115 days period) located within Xuwei Salt field, Lianyungang City of Jiangsu Province. The average harvest for organic pond was 1001 kg ha-1, with an average size of 15.7 g; while the harvest for conventional pond was 753 kg ha-1, with an average size of 12.7 g. During the shrimp growing period, mean values for temperature, salinity, pH and dissolved oxygen (DO) in ponds, inlet and outlet water were not significantly different, whereas the levels for Chlorophyll a, nutrients, chemical oxygen demand (COD) and total organic carbon (TOC) showed the highest in the outlet water, followed by ponds and inlet water. The inlet water quality was found to be closely associated with outlet water quality. Chlorophyll a, nitrate, nitrite, inorganic phosphorus, COD and TOC were lower in organic pond than in its conventional counterpart. But for ammonium, the level is higher in the organic pond than in the conventional system. The authors conclude that, compared with the conventional system, organic shrimp system had significantly comparable yields and higher environmental profits. Its significance could prove vital for the sustainability of increasing shrimp farming in the world.

Key words: organic aquaculture; shrimp; water quality; inlet water, outlet water

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