Ecotoxicity of Selected Marine Paints on Tilapia guineensis, Palaemonetes africanus, Tympanotonus fuscatus, Aspergillus flavus and Pseudomonas aeruginosa
Keywords:
Toxicity, Mortality, Heavy metals, Marine paint, Total Petroleum, Hydrocarbon (TPH), Poly Aromatic Hydrocarbon (PAH).Abstract
Physiochemical analyses of two marine paints; Jotun and International paints, revealed 437.87mg/l and 382.13mg/l for TPH, 11.47 and 14.96mg/l for PAH. Heavy metals present included Nickel (6.904 and 9.208mg/L), iron (601.36 and 1,620.48mg/l), lead (16.47 and 174.40mg/l), Copper (5.848 and 22.732mg/l), Zinc (25.152 and 52.56m/l), Cadmium (0.41 and 1.43mg/l) and Chromium (2.632 and 3.348 mg/l). Mortality was used as an index for the 96hr acute toxicity test for fish, mollusc and crustacean while 24hr and 48hr were used for Bacteria and Fungi. Median lethal concentration (LC50) was calculated using the Probit method. The 96hr LC50 for Tilapia guineensis, Palaemonetes africanus, and Tympanotonus fuscatus for International paint were 5.01, 9.14, and 7.15ppm while that of Jotun paint were 7.62, 5.76 and 7.97ppm. The 24hr LC50 for Tilapia guineensis, Palaemonetes africanus, and Tympanotonus fuscatus for both toxicants were 0.21 and 0.26ppm respectively. The 24hr LC50 for Pseudomonas aeruginosa for both toxicants were 0.26 and 0.35ppm respectively. The 48hr LC50 for Aspergillus flavus for both toxicants are 0.21 and 0.26ppm. There was no significant difference between the LC50 of both paints to the various test organisms. Iron was found to be more predominant in the Tilapia guineensis than other metals. These findings further portray that the use of marine paint should be continued but manufacturers should develop environment-friendly nonstick coatings to prevent the adhesion of fouling organism by providing an extremely smooth surfaces on which these organisms have great difficulty in settling.Downloads
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