THE HISTOLOGICAL ASSESSMENT OF CLARIAS GARIEPINUS’ GILLS: AN ECOTOXICOLOGICAL EVALUATION OF MGBUOBA FISH POND
Paul, Chikwuogwo wokpeogu and *Allison, Theodore Athanasius
ABSTRACT
Background: Aquatic toxicology is the study of the effects of manufactured chemicals, other anthropogenic, natural materials and activities on aquatic organisms at various levels of organization from subcellular through individual organisms to communities and ecosystems. Materials and Methods: The sampling involved harvesting table-sized fish: twenty fishes from MGBUOBA and ten fishes from ARAC. Histological assessment involved determination of the qualitative and semi-quantitative analysis of the gills of the harvested fishes. Results: the results got showed that tissue samples of gills had a higher level of histological alterations in MGBUOBA as compared to ARAC. The alterations observed were based on circulatory disturbances (CD) which includes hyperemia, haemorrhage, vacuolation. Regressive change (RC) which includes necrosis and progressive change (PC). The Histological Alteration Index, that is, Fish Index MGBUOBA (12.3) was greater than ARAC (12.0). Conclusion: Alterations in the gill of the fish indicates that the fishes were exposed to a mixture of various pollutants though at low concentrations and these alterations cannot be regarded as toxicant specific.
Keywords: Gill, ARAC, Pond, Mgbuoba.
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