Abstract:Bioaccumulation potential of selected heavy metals viz. Pb, Cd, Cr, Cu, and Zn in muscle, gills and liver of food fish, Mystus gulio (Anguluwa) inhabiting in Bolgoda Lake were assessed by analyzing metal levels in the fish collected from four main locations: Weras Ganga, North Lake, Bolgoda Ganga and South Lake. In addition, water and sediment samples were taken concurrently from the sampling locations for determination of the metal levels. The metal levels were analysed by atomic absorption spectrometry using… Show more
“…Several studies have been carried out previously to assess physico-chemical parameters (Silva 1996), metal pollution (Senarathne and Pathiratne 2007) and PAH pollution in Bolgoda Lake. The present study is the first study which focused on biomonitoring of water pollution in Sri Lankan water bodies using a suite of biomarkers in Nile tilapia.…”
Section: Discussionmentioning
confidence: 99%
“…Over 50 species of edible fishes including tilapias (Oreochromis species) reside in Bolgoda Lake. Occurrence of high levels of heavy metals and PAHs in the lake has been reported previously Senarathne and Pathiratne 2007).…”
The present study reports the first analysis of water pollutants in Sri Lankan waters using a suite of biomarkers in Nile tilapia (Oreochromis niloticus) residing in Bolgoda Lake which receives urban, industrial and domestic wastes from multiple sources. The fish were collected from the lake in the dry period (April 2005) and wet periods (September 2005, October 2006) and the levels of biomarkers viz. hepatic ethoxyresorufin O-deethylase (EROD), glutathione S-transferase (GST), metallothioneins, biliary fluorescent aromatic compounds, brain and muscle cholinesterases (ChE) were compared with those of the laboratory reared control fish and the fish obtained from a less polluted water body, Bathalagoda reservoir (reference site). The results revealed that biomarker levels of the fish collected from the reference site were not significantly different from the controls. Hepatic EROD and GST activities in fish from Bolgoda Lake were induced 4.2-16.6 folds and 1.4-3.3 folds respectively compared with the control fish. Analysis of bile in the lake fish revealed recent uptake of naphthalene, pyrene and benzo(a)pyrene type polycyclic aromatic hydrocarbons (PAHs). The induction of EROD activities in feral fish reflects the exposure of fish to aryl hydrocarbon receptor agonists including PAHs present as pollutants in the Bolgoda Lake. Cholinesterase activity in the fish inhabiting one sampling site of Bolgoda Lake was lower (22-40% inhibition) than the activity measured in the control fish indicating the presence of anticholinesterase pollutants in the area. Hepatic metallothionein levels in the lake fish were higher (1.9-3.2 folds) in comparison to the controls indicating metal exposure. The results support the potential use of these biomarkers in Nile tilapia in assessing pollution in tropical water bodies.
“…Several studies have been carried out previously to assess physico-chemical parameters (Silva 1996), metal pollution (Senarathne and Pathiratne 2007) and PAH pollution in Bolgoda Lake. The present study is the first study which focused on biomonitoring of water pollution in Sri Lankan water bodies using a suite of biomarkers in Nile tilapia.…”
Section: Discussionmentioning
confidence: 99%
“…Over 50 species of edible fishes including tilapias (Oreochromis species) reside in Bolgoda Lake. Occurrence of high levels of heavy metals and PAHs in the lake has been reported previously Senarathne and Pathiratne 2007).…”
The present study reports the first analysis of water pollutants in Sri Lankan waters using a suite of biomarkers in Nile tilapia (Oreochromis niloticus) residing in Bolgoda Lake which receives urban, industrial and domestic wastes from multiple sources. The fish were collected from the lake in the dry period (April 2005) and wet periods (September 2005, October 2006) and the levels of biomarkers viz. hepatic ethoxyresorufin O-deethylase (EROD), glutathione S-transferase (GST), metallothioneins, biliary fluorescent aromatic compounds, brain and muscle cholinesterases (ChE) were compared with those of the laboratory reared control fish and the fish obtained from a less polluted water body, Bathalagoda reservoir (reference site). The results revealed that biomarker levels of the fish collected from the reference site were not significantly different from the controls. Hepatic EROD and GST activities in fish from Bolgoda Lake were induced 4.2-16.6 folds and 1.4-3.3 folds respectively compared with the control fish. Analysis of bile in the lake fish revealed recent uptake of naphthalene, pyrene and benzo(a)pyrene type polycyclic aromatic hydrocarbons (PAHs). The induction of EROD activities in feral fish reflects the exposure of fish to aryl hydrocarbon receptor agonists including PAHs present as pollutants in the Bolgoda Lake. Cholinesterase activity in the fish inhabiting one sampling site of Bolgoda Lake was lower (22-40% inhibition) than the activity measured in the control fish indicating the presence of anticholinesterase pollutants in the area. Hepatic metallothionein levels in the lake fish were higher (1.9-3.2 folds) in comparison to the controls indicating metal exposure. The results support the potential use of these biomarkers in Nile tilapia in assessing pollution in tropical water bodies.
“…Contaminations of trace metals in inland water bodies can be determined using the metal levels in water; sediments and resident biota especially using fish species (Senarathne and Pathirathne, 2007). Currently, trace metal pollution in aquatic ecosystems is one of the growing problems worldwide and it has been increasing at an alarming rate (Ogoyi et al, 2011).…”
Currently, an aquatic ecosystem of Sri Lanka is faced with acute environmental problems due to trace metal pollution. Bomburuella is one of reservoirs situated in
“…This is of particular importance in ecotoxicology, as heavy metals are highly persistent and have the tendency to bioaccumulate and concentrate in the food chain; at higher concentrations, they become toxic to organisms. Heavy metal pollution in water can be monitored through measuring their concentrations [Senarathne and Pathiratne, 2007].…”
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