Observations on metal concentrations in commercial landings of two species of tilapia (Oreochromis mossambicus and Oreochromis niloticus) from reservoirs in six river basins in Sri Lanka

Samples of the muscle of two species of tilapia (Oreochromis mossambicus and O. niloticus; 17-20 cm length) were obtained from at least one reservoir in each of the six river basins (Aruvi Aru, Kala Oya, Kirindi Oya, Ma Oya, Mahaweli, and Walawe Ganga catchments) in Sri Lanka. The metals Ca, Cu, Fe,...

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Bibliographic Details
Published in:Toxicological and environmental chemistry 2010-04, Vol.92 (4), p.749-763
Main Authors: Allinson, G., Salzman, S.A., Turoczy, N., Nishikawa, M., Amarasinghe, U.S., Nirbadha, K.G.S., Silva, S.S. De
Format: Article
Language:English
Subjects:
catchment land use
Fish
Freshwater
Health risk assessment
Metals
Muscles
reservoir fisheries
Reservoirs
Risk
River basins
Samples
Sri Lanka
Statistical methods
Tilapia
Tissues
Toxicity
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Summary:Samples of the muscle of two species of tilapia (Oreochromis mossambicus and O. niloticus; 17-20 cm length) were obtained from at least one reservoir in each of the six river basins (Aruvi Aru, Kala Oya, Kirindi Oya, Ma Oya, Mahaweli, and Walawe Ganga catchments) in Sri Lanka. The metals Ca, Cu, Fe, K, Mg, Mn, Na, and Zn were consistently detected in the muscle tissue. Overall, there were few differences in the concentration of metals between the two species of fish, although there were also some statistically significant differences (p < 0.05) in the concentrations of some metals in fish obtained from some of the reservoirs. Aruvi Aru stands out as a river basin in which the two fish species have significantly lower concentration of metals when compared to other river basins. The concentration of the metals studied were below WHO and FSANZ guideline values for fish, suggesting that the consumption of the metals found in tilapia from these reservoirs poses little risk to human health.
ISSN:0277-2248
1029-0486
DOI:10.1080/02772240903049710