Toxicology Study of Dispersant Corexit 9527 to 14-day Tilapia Guineensis Fingerlings
The sensitivity of 14-day old fresh water tilapia guineensis fingerlings to dispersant corexit 9527 was studied in static renewal bioassay glass tank, using tap water to access the lethal concentrations of the chemical on the test organisms. The test organisms were collected from a fish pond in Warri, Delta State of Nigeria. In the most predictive applications, the LC50 is normally used as an estimate of the incipient lethal level, also known as the lethal threshold concentration, asymptotic LC50 or tolerant limit. In fish tests, the incipient lethal level often occurs within 4 days, and this is one rationale behind the 96-hr length for a standard acute fish test. The median lethal concentration LC50 of dispersant corexit 9527 on tilapia guineensis was determined using a computerized probit analysis. This research showed that the median lethal concentration, LC50 for the 14-day old tilapia guineensis fingerlings were 54.82mg/l, 24.21 mg/l and 16.47mg/l for 2, 3 and 4 days respectively; and the 14-day old tilapia guineensis showed high sensitivity to the different lethal concentrations of corexit 9527 at 96-hr duration.
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