Bioaccumulation of Zn in Muscle and Brain Tissues of the African Catfish—Clarias gariepinusReportar como inadecuado




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Increasingrate of consumption of the common African catfish, Clarias gariepinus, a popular delicacy in Delta State, Nigeria has raisedworries about the safety of health of consumers in the face of perceived risinginput of recalcitrant pollutants such as the heavy metals in aquatic habitats. Thisresearch investigated the presence and levels of Zn in muscle and brain tissuesof C. gariepinus sourced from selectedmarkets in Delta State. Replicate adult fish samples were obtained from seven marketlocations in Oleh, Asaba, Ekpan, Ogwashi-Ukwu, Okere, Abraka and Ughelli towns,labeled and taken to the laboratory in iced coolers. The presence and levels ofthe heavy metal were determined spectrophotometrically. Concentrations ranged from0.015 - 0.19 0.09 ± 0.02 mg-kg d.w. in muscle and 0.035 - 0.36 0.16 ± 0.03 mg-kgd.w. in brain tissues, even as accumulation levels differed significantly t = 0.005between the tissues at p < 0.05. Therewas also significant locational heterogeneity in accumulations of the metal F100.97 > Fcrit4.02 at the 95% confidence limit; with least accumulationof 0.03 ±0.01 mg-kg d.w. recorded in fish samples obtained from Ughelli and maximumaccumulation of 0.28 ±0.07 mg-kg d.w. recorded in those obtained from Oleh locations.However, levels were below the Food and Agricultural Organization and World HealthOrganization acceptable limits for Zn in edible fish. Results revealed that lipophilicbrain tissues accumulated more heavy metal than muscle tissues. Since accumulationlevels were low, they do not currently constitute public health risks to consumersin Delta State.

KEYWORDS

African Catfish, Heavy Metals, Tissue Accumulation, Delta State, Local Delicacy

Cite this paper

Esinulo, A. , Kelle, I. and Ogbuagu, D. 2016 Bioaccumulation of Zn in Muscle and Brain Tissues of the African Catfish—Clarias gariepinus. Journal of Geoscience and Environment Protection, 4, 12-20. doi: 10.4236-gep.2016.45002.





Autor: Amanna Chibuike Esinulo, Iloegbunam Alfred Kelle, Dike Henry Ogbuagu*

Fuente: http://www.scirp.org/



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