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Journal of Applied Sciences and Environmental Management
World Bank assisted National Agricultural Research Project (NARP) - University of Port Harcourt
ISSN: 1119-8362
Vol. 18, No. 1, 2014, pp. 49-52
Bioline Code: ja14007
Full paper language: English
Document type: Research Article
Document available free of charge

Journal of Applied Sciences and Environmental Management, Vol. 18, No. 1, 2014, pp. 49-52

 en Toxicological Evaluation of Ethanol Extract of Adenium obesum check for this species in other resources Stem Bark in African Catfish, Clarias gariepinus check for this species in other resources
ABALAKA, SAMSON ENEOJO; FATIHU, MUHAMMAD YAKASAI; IBRAHIM, NAJUME DOGUWAR GIGINYA & AMBALI, SULEIMAN FOLORUNSHO

Abstract

The toxicity of ethanol extract of Adenium obesum check for this species in other resources stem bark as a tool for aquaculture pond management prior to the stocking of desired fish species was evaluated in Clarias gariepinus check for this species in other resources over a 96-h exposure. The fish were exposed to 6.25 mgL-1, 7.50 mgL-1, 8.20 mgL-1, 8.80 mgL-1 and 10.00 mgL-1 of the extract and a control in an acute static toxicity bioassay after performing a range finding test to determine the median lethal concentration (LC50) of the extract. Exposed fish showed signs of changed behaviours with adaptive responses, respiratory distress and nervous compromise, including mortality in some of the exposed fish. The appearance and intensities of the observed signs were concentration and exposure period-dependent. An LC50 value of 7.35 mgL-1 was established for the extract in the exposed fish where mean mortality was significantly (p<0.05) concentration and exposure period-dependent. The toxic nature of the extract in the exposed hardy fish can be exploited for effective aquaculture pond management against some unwanted predatory and weed aquatic organisms. However, the indiscriminate use of higher extract concentrations could seriously jeopardise the biodiversity of any aquatic environment.

Keywords
Adenium obesum; Clarias gariepinus; toxicity; median lethal concentration

 
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