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 |
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| Authors: | G. Allinson S.A. Salzman N. Turoczy M. Nishikawa U.S. Amarasinghe K.G.S. Nirbadha |
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| Affiliation: | 1. Future Farming Systems Research Division, Department of Primary Industries , PO Box 114, Queenscliff, VIC 3225, Australia graema.allinson@dpi.vic.gov.au;3. School of Information Systems , Deakin University , PO Box 423, Warrnambool, VIC 3280, Australia;4. School of Ecology and Life Sciences , Deakin University , PO Box 423, Warrnambool, VIC 3280, Australia;5. Laboratory for Intellectual Fundamentals for Environmental Studies , National Institute for Environmental Studies , 16-2 Onogawa, Tsukuba, Ibaraki 305, Japan;6. Department of Zoology , University of Kelaniya , Kelaniya 11600, Sri Lanka |
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| Abstract: | 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. |
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| Keywords: | Sri Lanka reservoir fisheries tilapia metals catchment land use |
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