Feed the Future Innovation Lab for Collaborative Research on Aquaculture & Fisheries

Water quality parameters in 22 ponds of a Litopenaeus vannamei culture farm in Fengxian District of Shanghai were investigated from April to September in 2009. Fifteen parameters including chlorophyll-a (Chl. a), temperature, pH, dissolved oxygen (DO), transparency, suspended substance (SS), total organic carbon (TOC), biological oxygen demand (BOD5), chemical oxygen demand (CODMn), nitrite nitrogen (NO2--N), nitrate nitrogen (NO3--N), ammonia nitrogen (NH3-N), total nitrogen (TN), active phosphorus (PO43--P) and total phosphorus (TP) were determined. Descriptive statistics was conducted and the correlation between Chl. a and other parameters was analyzed. The statistical analysis results showed that Chl. a had extremely significantly linear positive correlation with SS, TOC, BOD5, CODMn, TN and TP. Significantly linear positive correlation existed between Chl. a and DO. Extremely significantly linear negative correlation was confirmed between Chl. a and transparency while Chl. a had significantly linear negative correlation with PO43--P. Chl. a had no significant correlation with water temperature, pH, NO2--N, N03--N and NH3-N. According to the principles of selecting independent variables in the multiple linear regression analysis, four water quality parameters including TOC, TN, PO43--P and TP were used for establishing the stepwise regression model which was Chl. a=-0.054 5+0.003 49 TOC+0.015 3 TN-0.418 PO43--P+0.276 TP (r=0.715 5). The effects of these four factors on Chl. a were tested using the partial regression coefficient. The most influential water quality parameter on Chi. a were TP and then TOC, PO43--P, TN in turn. The results would help further study on ecological rules and water environmental protection in aquaculture ponds.

NOP 10-A05 (English)