Study the Impact of pH and Water Hardness on Accumulation of Lead (Pb) and Growth of Juvenile Tilapia Tilapia (Oreochromis niloticus) under Laboratory Conditions
Main Article Content
Abstract
pH has affected on Lead (Pb) accumulation in muscle tissue of tilapia fish: at pH=5.5, Pb content accumulated in tilapia muscle was the highest at 30 days of exposure. However, at pH=6, Pb concentration accumulated in muscle tissue of tilapia fish was the highest on the 15th and 60th day of exposure. With pH acids to neutral, Pb level in tilapia's muscle increased during the period from 0 to 30 days of exposure, then was decreased at day 45, and increased on the 60th day. pH also effected to the growth rate of tilapia fish, pH=7, growth rate of the fish was good, however at pH<7, the growth rate tends to decrease after 45 to 60 days of exposure. Water hardness also affected on Pb accumulation and growth of tilapia fish. Pb concentration in fish muscle at soft water (hardness ≤100 ppm) was higher than fish in hard water. Water hardness also effected to growth rate of tilapia fish, in the soft water, growth rate of the tilapia increased rapidly in during 0 to 30 days, then growth rate decreased from days 30 to 60 of exposure.
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