Histopathological changes in the gills of freshwater fish, Oreochromis niloticus (L.) Juveniles exposed to Moringa oleifera (Lam.) fresh root-bark extract

Adesina, Babatunde Taiwo and Oguntuga, A.O. (2009) Histopathological changes in the gills of freshwater fish, Oreochromis niloticus (L.) Juveniles exposed to Moringa oleifera (Lam.) fresh root-bark extract. Toxicology Letters, 189 (2). S194-S195. ISSN 03784274

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Official URL: http://dx.doi.org/10.1016/j.toxlet.2009.06.589

Abstract

Chronic sublethal toxicity of Moringa oleifera fresh root-bark extract on freshwater fish, Oreochromis niloticus juveniles was assessed using static renewable bioassay method to determine the toxicity of the extract on the gills of O. niloticus juveniles. However, Histopathology is a function of toxicity test to determine the safety level of exposure to toxicants in aquatic environment. Histopathological lesions in the gills of Oreochromis niloticus juveniles were assessed after 12-week exposure to fresh root-bark cold water extract of Moringa oleifera at chronic-sublethal concentrations of 0, 3 and 6 mg l−1, where 0 mg l−1 served as the control group. Gills of O. niloticus juveniles exposed to 3 and 6 mg l−1 were collected and processed in an absolute ethanol along with the control group. They were later transferred and stained with haematoxylin and eosin according to the standard routine histological methods. Histopathological changes were recorded in the gills of Oreochromis niloticus juveniles exposed to chronic sublethal concentrations of M. oleifera fresh root-bark extract after 12-week exposure. After long exposure to the M. oleifera extract, major histopathological changes that occurred during the exposure were, gill lesions, gill arches vacuolation, lamellar hyperemia, complete degeneration of lamellae and reduction in the contents of all parts of gills. There were no lesions in gills of control fish as sign of histopathological changes. Moringa oleifera is toxic even at sublethal concentrations to freshwater fish, O. niloticus juveniles. However, it could be used as a risk assessment tool to establish safe limits to wipe out predatory fish in ponds prior to stocking.

Item Type: Article
Subjects: S Agriculture > SH Aquaculture. Fisheries. Angling
Divisions: Faculty of Medicine, Health and Life Sciences > School of Psychology
Depositing User: BABATUNDE ADESINA
Date Deposited: 13 Jun 2014 13:04
Last Modified: 13 Jun 2014 13:04
URI: http://eprints.lmu.edu.ng/id/eprint/26

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