International Journal of Applied Science and Technology

ISSN 2221-0997 (Print), 2221-1004 (Online) 10.30845/ijast

Shrimp Pond Effluent Quality during Harvesting and Pollutant Loading Estimation using Simpson’s Rule
Lee Nyanti, George Berundang, Ling Teck Yee

 

Abstract
Shrimp aquaculture is a lucrative industry worldwide and more so in the tropics where two or three crops could be produced per year. Malaysia has extensive coastal zones for shrimp aquaculture and this industry will expand further with the creation of Aquaculture Industrial Zone. However, little is known about the extent of impact of this industry in terms of the quality and quantity of pollutants generated. Therefore, the objective of this study was to determine shrimp pond effluent quality and subsequently estimate the pollutants loading. Water samples were taken at the outflow gate every 10 cm drop in the level of the pond water during harvesting and analyzed. Results show that dissolved oxygen was below 4 mg/L when not aerated. Total suspended solids was high (33-173 mg/L) and five-day biochemical oxygen demand (BOD5) ranged from 5.9 to 18.7 mg/L. Chemical oxygen demand (COD) was much higher than BOD5 values. Total soluble phosphorus (TP) were less than 0.07 mg/L and total nitrogen (TN) was 1.2 to 3.7 mg/L. Chlorophyll a (Chl-a) was high, ranging from 61 to 112 μg/L. Using Simpson’s rule, pollutant loadings were computed and the quantities (kg/ha/cycle) from the highest to the lowest were COD>TSS>BOD5>TN>TP>Chl-a. This study shows that shrimp pond effluent needs to be treated to protect the estuarine ecosystems and ensure the sustainability of this industry.

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