Assessment of heavy metals in water samples and tissues of edible fish species from Awassa and Koka Rift Valley Lakes, Ethiopia

2012 ◽  
Vol 185 (4) ◽  
pp. 3117-3131 ◽  
Author(s):  
Larissa Dsikowitzky ◽  
Mesfin Mengesha ◽  
Elias Dadebo ◽  
Carlos Eduardo Veiga de Carvalho ◽  
Sven Sindern
Keyword(s):  
Heavy Metals ◽  
Fish Species ◽  
Water Samples ◽  
Rift Valley ◽  
Rift Valley Lakes ◽  
Edible Fish

scholarly journals Heavy Metals in Fish Muscle from an Ethiopian Rift-Valley Lake (Hawassa) and a Neighboring Stream (Boicha): Assessment of Human Health Risks

2020 ◽  
Vol 24 (8) ◽  
pp. 1409-1418
Author(s):  
B. Samuel ◽  
S. Sorsa ◽  
F. Daniel ◽  
G. Riise ◽  
G.M. Zinabu
Keyword(s):  
Heavy Metals ◽  
Health Risk ◽  
Human Health ◽  
Health Risks ◽  
Fish Species ◽  
Fish Consumption ◽  
Rift Valley ◽  
Ethiopian Rift ◽  
Human Health Risks ◽  
Muscle Tissues

Concentrations of heavy metals (Cr, Co, Fe, Ni, Cu, Zn, As, Se, Pb and Hg) in muscle tissues of two fish species (Clarias gariepinus and Oreochromis niloticus) in an Ethiopian rift-valley lake (Hawassa) and a neighboring stream (Boicha) were determined. Target hazard quotients (THQ), hazard index (HI) and target cancer risk (TCR) were used as indices to evaluate potential human health risks from fish consumption. Average concentrations of metals decreased in the order Zn>Fe>Se>Cu>Hg>As>Ni>Cr>Co>Pb and Zn>Fe>Se>Cu>As>Hg>Cr>Ni>Pb>Co in muscle tissues of C. gariepinus and O. niloticus, respectively. Mean concentrations of Hg (0.34+0.04 mg kg-1) in muscle tissues of C. gariepinus from Lake Hawassa, and As (0.18+0.05 mg kg-1) as well as Hg (0.46+0.03 mg kg-1) in muscle tissues of C. gariepinus from Boicha stream were above the safety limits set by WHO/FAO. Likewise, mean concentrations of As (0.31+0.03 mg kg-1) and Hg (0.19+0.05 mg kg-1) in muscle tissues of O. niloticus from Lake Hawassa and Cr (0.19+0.03 mg kg-1), As (0.33 +0.04 mg kg-1), and Hg (0.34+0.09 mg kg-1) in O. niloticus from Boicha stream were also above safety limits. From the results of human health risk assessments it was concluded that Cr, Cu, Hg and As pose potential health risks due to consumption of the two fish species from both water bodies. Moreover, effects of all heavy metals put together may affect human health as indicated by the high HI. Effluents from industries are assumed to be the main sources of the heavy metals. Therefore, regular monitoring of the water bodies and policy interventions with respect to waste disposal are recommended to protect the health of the ecosystem and the public. Keywords: Fish consumption, health risk, heavy metals, Lake Hawassa

scholarly journals Ecological risk assessment of heavy metals and water bird distribution in rift valley lakes, Kenya

2017 ◽  
Vol 9 (3) ◽  
pp. 30-44
Author(s):  
Mercy Barasa ◽  
Mbaria James ◽  
Muchemi Gerald ◽  
Gakuya Francis ◽  
Kariuki Edward ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Risk Assessment ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
Rift Valley ◽  
Water Bird ◽  
Bird Distribution ◽  
Rift Valley Lakes

scholarly journals Analysis of Heavy Metals Concentration in Tissues of Three Different Fish Species Included in Human Diet from Danube River

2016 ◽  
Vol 66 (1) ◽  
pp. 89-102 ◽  
Author(s):  
Đ. Raša Milanov ◽  
P. Milena Krstić ◽  
V. Radmila Marković ◽  
A. Dragoljub Jovanović ◽  
M. Branislav Baltić ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Digestive Tract ◽  
Fish Species ◽  
Cyprinus Carpio ◽  
Water Samples ◽  
Silver Carp ◽  
Danube River ◽  
Hypophthalmichthys Molitrix ◽  
Silurus Glanis ◽  
Fish Samples

AbstractThe aim of this study was the investigation of water, sediments and fish tissues contamination with heavy metals. All samples were taken from the Danube River in Belgrade region, a location upstream from Batajnica. Concentrations of Cd, Hg and Pb in water samples were not detected, while concentrations of Zn, Fe, Cu and As were in the range of 0.004 - 0.330 mg L-1. Iron was the most deposited metal in sediment samples in contrast to water samples where all investigated metals were detected. For the purpose of heavy metals determination in fresh fish tissue, fifteen samples of three different fish species, silver carp (Hypophthalmichthys molitrix), common carp (Cyprinus carpio) and wels catfish (Silurus glanis) were collected. Concentrations of Pb, Cd, As and Hg were determined in the digestive tract, liver and muscle by absorption spectroscopy. The highest concentration of Pb was in the digestive tract in all three fish species, ranging from 0.036 to 1.518 μg g-1, while Cd was mostly deposited in the liver. Concentrations of As were in the range of 0.36 - 0.73 μg g-1in Hypophthalmichthys molitrix, 0.013 - 0.18 μg g-1in Cyprinus carpio and 0.003 - 0.005 μg g-1in Silurus glanis tissues, while the content of Hg was equal in all tested tissues of carp. Concentrations of all metals were found to be present in the fish samples at different levels, but these values are under the maximum residual levels prescribed by the European Union (EU) and the maximum allowed concentrations (MAC) for Serbia, so the fish meat is acceptable for the human consumption.

The composition of fish communities of nine Ethiopian lakes along a north-south gradient: threats and possible solutions

2012 ◽  
Vol 62 (3) ◽  
pp. 315-335 ◽  
Author(s):  
Jacobus Vijverberg ◽  
Eshete Dejen ◽  
Abebe Getahun ◽  
Leopold A.J. Nagelkerke
Keyword(s):  
Species Richness ◽  
Fish Species ◽  
Rift Valley ◽  
Fish Communities ◽  
Common Species ◽  
Model Estimate ◽  
Lake Tana ◽  
Standardized Protocol ◽  
Ethiopian Lakes ◽  
Rift Valley Lakes

Fish populations of nine Ethiopian freshwater lakes were quantitatively sampled with a standardized protocol, using multi-mesh gill nets. In total, 27 species were identified, but only 14 species were common. Based on the common species, the fish communities showed large differences in their species composition, except for Lake Abaya and Lake Chamo which were similar. Most fish species were observed in only one or two lakes. Compared with the information reported in literature the present study generally underestimated the species richness. The empirical model of Amarasinghe and Welcomme (2002) for African lakes was used to estimate fish species richness, which was compared with species presence reported in literature. Biodiversity in the two northern highland lakes is low, but not lower than the model estimate. Lake Tana has a high biodiversity which is close to what is estimated by the model, but three Rift Valley lakes have low biodiversity, lower than estimated by the model. There are also strong indications for the Rift Valley lakes that species richness was higher in the past because the species richness reported in the older literature was generally much higher than those observed by us in the present study and those reported in the more recent literature. Threats like overfishing, high sediment load and degradation of habitats were identified. It is recommended that Ethiopia should develop guidelines for fishery legislation and implement it through an enforcement agency. Moreover, catchments management should be practiced to save the water bodies and their fish communities.

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