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AGROVOC Keyword: search.filters.agrovoc.toxicityCommittee Member: search.filters.committeemember.Taberna, Hilario S.

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    Toxicity of Chemically Enhanced Water-Accommodated Fraction (CEWAF) of Petron bunker C oil on Asian Sea bass Lates calcarifer (Bloch) fingerlings at different salinity levels
    Bondoc, Christian Earvin D. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2011-03)
    Asian sea bass Lates calcarifer fingerlings were exposed to three CEWAF concentrations (0.3, 0.5 and 1.0%) at 28, 32 and 36%o and the mortality rate among the different treatments were compared. Dunnett t-test (a=0.05) showed that mortality in the CEWAF-exposed treatments differed significantly from that in the control, indicating that the toxicity of CEWAF caused the death of the fingerlings. The general trend of mortality was increasing with increased salinity although the results of Two-Way ANOVA (a=0.05) reveal that salinity did not influence the toxicity of CEWAF significantly. Further analysis with Fisher’s LSD test (a=0.05) showed that mortality only differed significantly between the 28%o and 36%o salinity groups. The differences between the salinity levels used in this experiment were too narrow to cause a significant difference in the interaction between CEWAF concentration and salinity. Sublethal effects of exposure to CEWAF observed in this study included aberrant swimming behavior, arching of the back, loss of buoyancy and loss of pigmentation.
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    Acute toxicity of polysolve oil dispersant to Nile tilapia (Oreochromis niloticus Linn.) fry
    Atas, Bryan B. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2011-03)
    Forty eight hour (48h) static bioassays were conducted to determine the toxicity of Polysolve oil dispersant to Nile tilapia (Oreochromis niloticus) fry. Median lethal concentrations (LC50) were 1.03, 0.79, 0.70, 0.45, and 0.39% for 24, 30, 42, and 48h, respectively. Polysolve is highly toxic to Nile tilapia fry at low concentrations. Results showed increasing toxicity over increasing length of exposure. It is therefore recommended that Polysolve must not be used in oil spill response. Sublethal effects of the dispersant on the fry include decreased activity and impaired responses