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Acute Toxicity of Gramoxone to Oreochromis niloticus (Trewavas) in Nigeria

Abstract

The acute toxicity of paraquat (1,1-dimethyl-4,4-bipyridinium dichloride) to fingerlings of Oreochromis niloticus (Trewavas) was determined in 96 hr staticbioassays. During the assays opercular ventilation and tailfin movement rates of the fish were determined.Haemotological parameters of the blood and histopathology ofthe gills were observed.The 96 hr LC50 of paraquat to fingerlings of O. niloticus was observed to be 11.84 mg L-1.Histopathology of gills of the fish exposed to 12.00 mgL-1, and 14.20 mg L-1 showed a dose-dependentdisruption of the architecture of the lamellae, filamenthyperplasia and atrophy, leading to impairment in oxygenuptake. Other symptoms of toxicosis in exposed fish includeloss of equilibrium; agitated swimming; air gulping;haemorrhaging of the gills, pectoral and pelvic fins; periodof quiescence and finally, death.

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Correspondence to A. A. Oladimeji.

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Babatunde, M.M., Oladimeji, A.A. & Balogun, J.K. Acute Toxicity of Gramoxone to Oreochromis niloticus (Trewavas) in Nigeria. Water, Air, & Soil Pollution 131, 1–10 (2001). https://doi.org/10.1023/A:1011959514500

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  • gill histopathology
  • Nigeria
  • Oreochromis niloticus
  • paraquat