2.4 Data Analysis The Cu, Pb and Zn loads in the water and sediments were compared with the Philippines’ Department of Environment and Natural Resources Administrative (DAO) 34-1990 standard [http://www.denr.gov.ph] while that of the sediments were compared with the Kloke’s Values [14]. Copper, lead and zinc concentration in the catfish (C. macrocephalus) was compared with international standards particularly that of Europe to conclude if it is safe or toxic for human consumption [17]. Metal concentration in sediments and fishes had to be compared with international standards due to the unavailability of such standards in the Philippines.