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Evaluation of Sediment Toxicity from Tumpat Lagoon on the Survival of
Chironomus Kiiensis
Mohamad Zahid bin Baharom
Supervisor: Dr Nurulnadia binti Mohd Yusoff
Bachelor of Science (Marine Science)
School of Marine & Environmental Sciences
The toxicity of sediments from Tumpat Lagoon was evaluated using Chironomus
kiiensis. Two toxicity test were conducted which are: (a) test 1 using 100% volume
of natural sediment (b) test 2 using 50% volume natural sediments with 50% control
sediments. The observed effects on C. kiiensis were the emergence rate, mortality
and sex ratios. The significant delayed in emergence rate in both sediment toxicities
were 16.5 ± 2.6 days post-fertilization (dpf) and 17.8 ± 6.2 dpf, respectively compared
to control which was 13.5 ± 2.7 dpf. The mortality was recorded higher in test 1 with
77% compared to test 2 with 37%. The sex ratios were affected as number of males
appeared more in test 1 but became female-biased in test 2. The reduction in terms
of emergence rate, mortality and sex ratios were influenced by dilution method. The
data recorded will be the indicators to determine the pollution level in the areas.
1876 | UMT UNDERGRADUATE RESEARCH DAY 2018