Abstract
Aquaculture is one of the main livelihoods of people living near Taal Lake. However, the quality of the lake is deteriorating due to the increasing number of fish cages and fish pens. In this study, ecotoxicological assessment of water and sediment in three areas (Gonzales, Bañaga, and Balakilong) of Taal Lake were conducted using Allium cepa and Daphnia magna assay. The result of A. cepa assay showed that areas with heavy aquaculture practices have a higher percentage of chromosomal aberrations (CAs) such as anaphase bridge, precocious chromosome, sticky chromosome, C-mitosis, and micronucleus (MN). This indicates the presence of cytotoxic and genotoxic compounds in the lake water. On the other hand, assessment of sediment samples using D. magna assay showed that the population exposed to samples from areas with heavy aquaculture practice showed a significantly lower number of offsprings compared to the control area. The result of our study shows the effectiveness of the two bioassays on the evaluation of ecotoxicity of water and sediment samples.
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