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Abstract
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Article Information:
Effect of Aqueous Leaf Extracts of Lepidagathis alopecuroides on the Behaviours and Mortality of Hybrid Catfish (Heterobranchus bidorsalis ♂ x Clarias gariepinus ♀) Fingerlings
U.U. Gabriel and I.B. Okey
Corresponding Author: Gabriel U.U.
Submitted: 2009 June, 10
Accepted: 2009 Sep., 02
Published: |
Abstract:
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Lethal renewable bioassay was conducted to evaluate the effect of aqueous extracts of leaves of
L. alopecuroides (0.00, 0.5, 1.0, 1.5, 2.0, 2.25 mg/l) on the behaviours and mortality of African catfish hybrid
(H. bidorsalis ♂ x C. gariepinus ♀) fingerlings (total length, 7.34±1.78cmSD; mean weight, 2.33±1.96 gSD).
Exposed fish were hyperactive, swimming erratically, showed hyperventilation and rapid tail beat with
increased mucus secretion on the skin and gills, gulped for air and became listless at he bottom of the aquaria
before death occurred. Opercular beat frequency (OBF) and Tail beat frequency (TBF) increased with increase
in the concentration of the chemical but decreased with exposure duration. The 96hrsLC50 and safe
concentration values were 0.77 and 0.08 mg/l, respectively. The median lethal time (MLT50) for the 0.50 and
2.25 mg/l concentration were 87.72 hrs and 29.72hrs, respectively. The positive linear correlation between
mortality, concentration and exposure duration show that mortality was influence by exposure duration and
concentration. The low lethal concentration values recorded in this study suggest that L. alopecuroides is highly
toxic to catfish hybrid fingerlings.
Key words: Lepidagathis alopecuroides, African catfish hybrid, behaviour, mortality, , ,
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Cite this Reference:
U.U. Gabriel and I.B. Okey, . Effect of Aqueous Leaf Extracts of Lepidagathis alopecuroides on the Behaviours and Mortality of Hybrid Catfish (Heterobranchus bidorsalis ♂ x Clarias gariepinus ♀) Fingerlings. Research Journal of Applied Sciences, Engineering and Technology, (3): Page No: 116-120.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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