The lakes were extremely big with very slow to no water flow, while for river, the size was moderate with modest to fast flowing water. Pedu and Kenyir lakes are used as irrigation for paddy field and hydroelectric, respectively, and are located approximately 10 km away from residential areas. Terengganu River originated from Kenyir Lake and flows through sand dredging, agricultural and residential areas. More than 200 floating net cages were present at the sampling sites in Pedu and Kenyir lakes but less than 100 floating net cages were present at each sampling sites along the Terengganu River.