A study was conducted on physicochemical parameters water from Ilo-abuchi, creek Niger Delta, Nigeria. The study aimed at evaluating the impact of sawmills and other associated wastes on water quality of the creek. The physicochemical parameters investigated were from February to July 2020 and the samples were analysed for pH, Temperature, Salinity, Conductivity, Total Suspended Solid (TSS), Total Dissolved Solids (TDS), and Total alkalinity using an in-situ Handheld Multimeter (Milwaukee Model pH600 and Laboratory Benchtop meter 860033-model. The Dissolved Oxygen (DO) was measured using Winkler’s method. Biochemical Oxygen Demand (BOD) was determined by the 5-day BOD test (APHA, 2005). Turbidity was measured using a 20cm diameter Secchi disc. Total alkalinity was determined by the American Society for Testing and Materials (ASTM D 1067B) Nitrate, Chloride, Phosphate, and Sulphate were determined using the method recommended by APHA 2340C (1995) standard. Water Temperature ranges between 27.7 -27.8 OC, pH 6.65 - 6.73, Conductivity 438.2 - 494.2 μS/cm, Salinity 2.8 -3.23ppt, TDS 77 – 87.27 mg/l, TSS 30.7 - 37.66 mg/l, DO 3.19 – 3.46 mg/l, BOD 2.05 - 3.38 mg/l, Turbidity 5.41- 5.98 NTU, Nitrate 8.78 - 10.02 mg/l, Hardness 31.77 - 33.98 mg/l, Chloride 23.03 -25.7 mg/l, Phosphorus 0.31 - 0.51 mg/l, Sulphate 13.27 - 16.60 mg/l. Alterations in water quality were more pronounced in the wet season (May, June, and July) compared to the dry season (February and March, and April). The nature of the effluents discharged into the creek were found to be essentially within the acceptable limits prescribed by law except for TSD and turbidity. These two parameters were slightly above the WHO standards. It is therefore recommended that environmental regulatory agencies such as NESREA and the Ministry of Environment should devise mechanisms to enforce existing environmental regulations concerning the discharge of effluents from different sources into the Ilo-abuchi Creek, which will aid in reducing the dumping of untreated wastes from the sawmills/other associated wastes and by extension conserve the aquatic life therein.
Crude oil exploration and exploitation is the major source of income or revenue generation for the Federal Government of Nigeria. Agriculture also forms a substantial part of the economic stability of the country. However, oil field chemicals used in crude oil exploration, herbicides and pesticides used for agricultural purposes, and other anthropogenic pollutants that are eventually released into the aquatic environment constitute serious sources of threat to the growth, survival, and productivity of fisheries resources. This review paper identified the impacts of these substances on fish, including growth inhibition, increased chromosome aberrations in cell roots, increased fungal biomass, and mortality. Recommendations arising from this review include proper disposal of oilfield chemical wastes, enhanced use of biological and mechanical pesticides/herbicides control methods as against the use of the chemicals, which helps to reduce the amount of these substances released into the aquatic environment, and direct remediation of the impacted environment. When implemented, these recommendations are expected to ultimately improve fish growth, survival, and productivity.
This study was conducted to assess the effect of water quality of the Ogun River on the haematological indices of the African catfish Clarias gariepinus. Samples of water and Clarias gariepinus were collected from Ogun River (Station I, Opeji and Station II, Lafenwa) to determine and compare effects of possible differences in water quality on haematological parameters of Clarias gariepinus. The results demonstrate that higher index values were recorded at station II than Station I for almost all the physicochemical parameters and only sulphate values from Stations I and II were statistically significant (P < 0.05).RÉSUMÉ: La qualité de l'eau et les indices hématologiques pour Clarias gariepinus dans la rivière Ogun (Nigéria).Le but de cette étude a été d'évaluer l'effet de la qualité de l'eau de la rivière d'Ogun sur les indicateurs hématologiques du poisson chat africain Clarias gariepinus. Des échantillons d'eau et des poissons de l'espèce C. gariepinus ont été collectés de la rivière d'Ogun (Station I, Opeji et Station II, Lafenwa) afin de mesurer de comparer les effets possibles des différences de la qualité de l'eau sur les paramètres hématologiques de C. gariepinus. Les résultats ont mis en évidence le fait que dans la station II ont été enregistrés des valeurs plus grandes que dans la station I pour presque tous les paramètres physiques et chimiques mais ils ont aussi montré le fait que seul l'indicateur sulfate a des valeurs statistiquement significatives (P < 0,05).REZUMAT: Calitatea apei și indici hematologici la Clarias gariepinus din râul Ogun (Nigeria).Prezentul studiu a fost efectuat pentru a evalua calitatea apei în râul Ogun, cu privire la indicii hematologici ai somnului african, Clarias gariepinus. Au fost colectate eșantioane de apă și pești din specia Clarias gariepinus din râul Ogun (stația I, Opeji și Stația II, Lanfewa) pentru a se determina și compara efectele posibilelor diferențe ale calității apei asupra parametrilor hematologici Clarias gariepinus. Rezultatele au arătat că în stația II s-au înregistrat valori mai mari decât în stația I, pentru aproape toți parametrii fizico-chimici și doar valorile pentru indicele sulfat din cele două stații au fost statistic semnificative (P < 0,05).
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