Three water samples were taken at three places surrounding every site during the slack tide time at a depth of 15–20 cm below the surface using Niskin bottles and measured for levels of: ammonium (NH4–N), nitrite (NO2–N), nitrate nitrogen (NO3–N), soluble reactive phosphorus (PO4–P), chemical oxygen demand (COD), chlorophyll a (Chl a) and dissolved oxygen (DO)