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Vol.2 , No. 3, Publication Date: May 19, 2015, Page: 121-125
&description=In this study, effects of a herbicide, Oxadiazon was investigated on the growth and nutrient utilisation of Clarias gariepinus. Three hundred C. gariepinus with mean weight 262.17±72.80g were acclimatized for 2 weeks in nine plastic tanks containing dechlorinated tap water at room temperature of 30±1.500C. Experimental fish were fed twice daily at 5% body weight. Feeding was stopped 24hours to the commencement of the bioassay. The exposure period lasted for 96 hours. Range finding and acute toxicity tests (96HLC50) were conducted according to standard methods. The LC50 was determined following the Probit analysis method. Test fish were subjected to the sub-lethal concentration of 1/2 and 1/5 of the LC50 of Oxadiazon and the concentration was continuously renewed every two days for a period of 6weeks. At the end of the experiment, total weight gain (TWG), percentage body weight gain (PBWG) and specific growth (SGR) rate was best in C. gariepinus exposed to 0.008ml/l concentration. The total feed intake (TFI) of fish exposed to 0.008ml/l and 0.02ml/l concentrations were significantly lower than the control which had no exposure. The feed conversion ratio (FCR) of 0.02ml/l concentration was significantly lower than the control and 0.008ml/l concentration. The protein efficiency ratio (PER) of control, 0.008ml/l and 0.02ml/l concentrations were not significantly different. The decrease observed in TWG, PBWG and SGR might have been related to the high concentration of Oxadiazon. To guarantee minimal negative side effects on rice field ecosystems, herbicides should have no or low toxicity, except for the target weeds.&picture=http://www.aascit.org/aascit/decorators/img/journal/892.jpg)
| [1] | Funmilola Ajani, Department of Wildlife and Ecotourism Management, University of Ibadan, Ibadan, Nigeria. |
| [2] | Adebola Oluyinka Ajiboye, Department of Animal Science and Fisheries Management, Bowen University, Iwo, Nigeria. |
| [3] | Omofolake Oluwatosin Oyelowo, Department of Animal Science, University of Ibadan, Ibadan, Nigeria. |
In this study, effects of a herbicide, Oxadiazon was investigated on the growth and nutrient utilisation of Clarias gariepinus. Three hundred C. gariepinus with mean weight 262.17±72.80g were acclimatized for 2 weeks in nine plastic tanks containing dechlorinated tap water at room temperature of 30±1.500C. Experimental fish were fed twice daily at 5% body weight. Feeding was stopped 24hours to the commencement of the bioassay. The exposure period lasted for 96 hours. Range finding and acute toxicity tests (96HLC50) were conducted according to standard methods. The LC50 was determined following the Probit analysis method. Test fish were subjected to the sub-lethal concentration of 1/2 and 1/5 of the LC50 of Oxadiazon and the concentration was continuously renewed every two days for a period of 6weeks. At the end of the experiment, total weight gain (TWG), percentage body weight gain (PBWG) and specific growth (SGR) rate was best in C. gariepinus exposed to 0.008ml/l concentration. The total feed intake (TFI) of fish exposed to 0.008ml/l and 0.02ml/l concentrations were significantly lower than the control which had no exposure. The feed conversion ratio (FCR) of 0.02ml/l concentration was significantly lower than the control and 0.008ml/l concentration. The protein efficiency ratio (PER) of control, 0.008ml/l and 0.02ml/l concentrations were not significantly different. The decrease observed in TWG, PBWG and SGR might have been related to the high concentration of Oxadiazon. To guarantee minimal negative side effects on rice field ecosystems, herbicides should have no or low toxicity, except for the target weeds.
Keywords
Nutrient Utilisation, Growth, Acute Toxicity, Herbicide, Oxadiazon, Clarias gariepinus
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