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Abstract
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Article Information:
Evaluation of Response Patterns in Somatic and Otolith Features of Laboratory- Reared and Wild Clarias gariepinus Exposed to Industrial Effluent
Aina O. Adeogun, Taofeek A. Babatunde and Azubuike V. Chukwuka
Corresponding Author: Aina O. Adeogun
Submitted: May 24, 2012
Accepted: June 29, 2012
Published: January 11, 2013 |
Abstract:
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This study was aimed at comparing the responses of somatic and otolith features in Clarias gariepinus under chronic exposure conditions to industrial effluents in the laboratory for 60 days and in the wild for 6 months.
Fish were collected upstream and downstream bi-monthly from a river receiving composite mixtures of industrial
effluent while laboratory-rearedC. gariepinus were exposed to the same effluent mixtures in 60 days static
renewal/bioassay using concentrations of 6.11, 3.05 and 2.23%, respectively and control series. A total of 21
variables representing saggital otolith and somatic data from both wild and laboratory fish were subjected to factor
analysis. For laboratory reared fish, PC 1 indexed as ‘otolith factor’, PC 2 indexed as ‘condition factor’ and PC 3
indexed as ‘paired fin factor’ accounted for 26.15, 19.01 and 12.55% of the total variance, respectively. For wild
fish, otolith factor (PC 1) and condition factor (PC 2) accounted for 38.24 and 22.69% of the variance respectively.
The first 3 components and the first 2 components for laboratory and wild fish accounted for more than 50% of total
variance in data. Reliability index (Cronbach’s alpha (&alpha>0.70) showed that the ‘otolith factor’ had strong internal
consistency and is reliable as a primary and viable index of stress for both laboratory and wild fish. The
complementary role of condition factor in stress detection was also highlighted. The emergence of paired features
(otolith, pectoral and pelvic fins) as sensitive parameters in toxicity responses may be an indication of the onset of
asymmetry in these structures.
Key words: Clarias gariepinus, condition factor, industrial effluents, otolith factor, paired fin factor, reliability index,
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Cite this Reference:
Aina O. Adeogun, Taofeek A. Babatunde and Azubuike V. Chukwuka, . Evaluation of Response Patterns in Somatic and Otolith Features of Laboratory- Reared and Wild Clarias gariepinus Exposed to Industrial Effluent. Research Journal of Applied Sciences, Engineering and Technology, (02): 626-634.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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