Water Quality of Nile Tilapia Cage Culture in Mekong River, Mukdahan Province
Abstract
Water quality analysis was conducted in Nile tilapia cage culture areas in the Mekong River in Mueang and Don Tan districts of Mukdahan province. Samples were collected in different seasons: winter (November 2021-February 2022), summer (March-June 2022), and rainy season (July-October 2022). A total of nine monitoring stations were sampled. The result of the study showed that the flow rate and settleable solids concentration in the rainy season were significantly higher than those in the winter and summer seasons (p<0.05). The flow rate ranged from 0.61-0.89 m/s, and the settleable solids ranged from 0.14 to 0.29 mg/L. Water temperatures in summer was statistically significantly higher than in the rainy and winter season (p<0.05). Water temperatures ranged from 23.3-30.3 ºC. The concentrations of total ammonia nitrogen and nitrite-nitrogen in winter were significantly higher than in the summer and rainy seasons (p<0.05). The average concentration of total ammonia nitrogen was between 0.08-0.59 mg/L and that of nitrite-nitrogen was between 0.003-0.080 mg/L. The amount of orthophosphate-phosphorus in the summer and rainy seasons was significantly higher than in winter (p<0.05). Orthophosphate was average between 0.001-0.160 mg/L. Other water quality parameters did not show any statistically significant differences between the seasons (p>0.05), with dissolved oxygen levels between 6.18-7.09 mg/L, pH 8.25-8.53, total dissolved solids (TDS) 102.5-152.8 mg/L, alkalinity 100.1-128.4 mg/L, and nitrate-nitrogen 0.03-0.29 mg/L. The water quality of the fish farming area in the Mekong River, Mukdahan province, throughout the study period was suitable for fish.References
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