Status of trace metals in smoked Clarias gariepinus cultured in earthen pond in Lagos state, Nigeria

Trace metals content in water, fishes (Tilapia mariae, Clarias gariepinus), earthworm (Libydrius violaceous) and sediment were determined from Ubeji River using Atomic Absorption Spectrophotometer (AAS). Metals determined were lead, cadmium, zinc, mercury, arsenic, copper and Iron. The results obtained revealed that all the metals were detected. Also, there were variations in metal levels in the samples. Highest Zn level was obtained in all the samples analysed (0.284ppm and 0.284ppm in water, 24.0mg/kg in Clarias gariepinus, 28.8mg/kg in Tilapia mariae, 1.16mg/kg in earthworm and 0.64mg/kg in sediment). The concentrations of trace metals obtained in this study are found to be dangerous. The metal levels in water from Ubeji River are higher than the WHO/FEPA standards for water quality. The concentrations of lead, zinc and copper obtained in the whole body of fishes exceeded the WHO/FEPA set standards for aquatic life. The presence of trace metals found in the sample from Ubeji River is attributed to the proximity of petroleum activity, construction works and other allied companies.

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Bioaccumulation of non-essential trace metals in tissues and organs of Clarias gariepinus (sharptooth catfish) from the Vaal River system – strontium, aluminium, lead and nickel

Water SA ◽

10.4314/wsa.v36i5.61996 ◽

2010 ◽

Vol 36 (5) ◽

Cited By ~ 26

Author(s):

D Crafford ◽

A Avenant-Oldewage

Keyword(s):

Trace Metals ◽

Clarias Gariepinus ◽

River System ◽

Vaal River

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Quality Evaluation of Some Commonly Consumed Oils and Fats

Asian Journal of Applied Chemistry Research ◽

10.9734/ajacr/2020/v5i330137 ◽

2020 ◽

pp. 32-38

Author(s):

Oluwasegun, Soliu Miniru ◽

Adunola, Abosede Bello

Keyword(s):

Fatty Acids ◽

Fatty Acid Composition ◽

Fatty Acid ◽

Acid Composition ◽

Saturated Fatty Acids ◽

Clarias Gariepinus ◽

Local Market ◽

Federal Institute ◽

Lagos State ◽

Pork Fat

Aim: To evaluate and compare the quality parameters of some commonly consumed oils and fats. Study Design: Laboratory experimental design was used. Place and Duration of Study: Cultured Clarias gariepinus was collected from a fish pond, Glycine max was purchased from a local market while pork, chicken and beef fats were collected from Oko Oba Abattoir, Agege, Lagos State, Nigeria. The study was carried out between September 2019 - February 2020 at the Oilseed Laboratory of Federal Institute of Industrial Research, Oshodi, Lagos State, Nigeria. Methodology: Oil available in C. gariepinus and G. max were extracted using Soxhlet extraction method while the animal fats were pre-treated to remove the impurities present in them. The chemical properties of the oils and fats were determined using standard methods of analysis while the fatty acid composition were analysed using Gas Chromatography-Mass Spectrophotometer. Results: Beef fat had the lowest peroxide (3.02mEQ/kg), anisidine (4.32mEQ/kg) and TOTOX value (10.36mEQ/kg), indicating that the fat could be stored for a long period of time without undergoing deterioration. The fatty acid composition shows that G. max oil, C. gariepinus oil and pork fat contains high concentration of polyunsaturated fatty acids while beef fat contains large number of saturated fatty acids. Conclusion: This study shows that G. max oil, C. gariepinus oil and pork fat have more nutritive value compared to chicken fat and beef fat although will be easily susceptible to oxidation due to the large number of double bonds present in them.

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Heavy Metal Concentrations in Fish from River Tano in Ghana and the Health Risks Posed to Consumers

Journal of Environmental and Public Health ◽

10.1155/2021/5834720 ◽

2021 ◽

Vol 2021 ◽

pp. 1-11

Author(s):

A. J. Nyantakyi ◽

S. Wiafe ◽

O. Akoto ◽

Bernard Fei-Baffoe

Keyword(s):

Trace Metals ◽

Health Risks ◽

Fish Species ◽

Clarias Gariepinus ◽

Good Condition ◽

Common Source ◽

Metal Concentrations ◽

Fish Muscles ◽

Fish Samples ◽

Mormyrus Rume

Appreciable levels of trace metals have been reported in the Tano basin, but data on the corresponding levels in fish and the risk they pose to consumers are limited. The levels of 7 trace metals in 18 fish muscles were assessed between November 2016 and October 2017 using acid digestion and PerkinElmer (PinAACle 900T) Atomic Absorption Spectrophotometry. Apart from Cu, all the metals studied were detected in all fish samples. The levels of Cr, As, and Hg were higher than the acceptable levels of fish muscles. Cr concentration ranged from 16.10 ± 0.2 mg/kg in Clarias gariepinus to 57.9 ± 4.2 mg/kg in Sarotherodon galilaeus. The levels of As ranged from 1.01 ± 0.08 in Clarias gariepinus to 3.00 ± 0.01 mg/kg in Mormyrus rume. Hg level was 0.58 ± 0.69 mg/kg in Oreochromis niloticus and 2.52 ± 0.70 mg/kg in Ctenopoma kingsleyae. However, Pb, Zn, and Cd concentrations were below the Food and Agriculture Organization limits with low target hazard quotients in all fish samples, suggesting no possible noncarcinogenic risks to adult consumers. Possible noncarcinogenic and carcinogenic health risks were recorded for As, Hg, and Cr in all fish species. Strong associations were observed between Hg, As, Zn, and Cr and between Pb and Cd suggesting a possible common source. Mormyrus rume fish species was under stress in the river, but the remaining species were in good condition. Periodic monitoring of trace metal concentrations in fish and enforcement of the buffer zone policy are recommended.

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