Acute toxicity of water soluble fraction of crude oil to the early life stages of the African Catfish (Clarias gariepinus). | [Pakistan Journal of Scientific and Industrial Research Series B: Biological Sciences • 2014]

Author(s):

1. Joshua Idowu Izegaegbe: Department of Zoology, Ambrose Alli University, Ekpoma, Nigeria

2. Femi Francis Oloye: Department of Chemistry, Adekunle Ajasin University, Nigeria;Department of Chemistry, Obafemi Awolowo University, Ile-Ife, Nigeria

3. Efere Martins Obuotor: Department Biochemistry, Obafemi Awolowo University, Ile-Ife, Nigeria

4. Victor Funso Olaleye: Department of Zoology, Obafemi Awolowo University, Ile-Ife, Nigeria

5. Stephen Adeyeni: Department of Zoology, Obafemi Awolowo University, Ile-Ife, Nigeria

Abstract:

Acute toxicity bioassay of water soluble fraction of crude oil (Escravos blend), was conducted to evaluate the toxicity on the early life stages of the African catfish (Clarias gariepinus) under static bioassay conditions. Five concentrations of water soluble fraction (WSF) of the crude oil (0, 1.25, 2.5, 5, 10 and 20%) were constituted in glass aquaria (25 cm ´ 24 cm ´ 10 cm). Twenty laboratory-reared frys were introduced in triplicate in each of the test aquaria and exposure conducted for 96 h. The median lethal concentration (LC50) and the 95% confidence interval was estimated using Trimmed Spearman-Karber method. The physicochemical characteristic of the test media was also evaluated. The 96 h median lethal concentration (LC50) at 95% confidence interval was estimated to give 2.84% (upper and lower confidence interval of 3.83% and 2.10%) of the water soluble fraction. There was no marked change in pH of the test media compared to the control. However, the dissolved oxygen content and the conductivity showed a concentration dependent decline in the test media when compared to the control. The frys were observed to be weak and swimming activities were reduced. It can be concluded from the study that the water soluble fraction of crude oil (Escravos blend) is toxic to early life stages of C. gariepinus.

Page(s): 97-103

DOI: DOI not available

Published: Journal: Pakistan Journal of Scientific and Industrial Research Series B: Biological Sciences, Volume: 57, Issue: 2, Year: 2014

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