Determination of selected heavy metal and analysis of proximate composition in some fish species from Ogun River, Southwestern Nigeria

Abstract

The aquatic environment is continuously at the mercy of man's negative impact on it. This study was designed to determine the proximate composition and concentration of some heavy metals in four fish species - Oreochromis niloticus, Malapterurus electricus, Parachanna obscura, Chrysichthys nigrodigitatus in Ogun River, Nigeria. The fish species were collected from the Abeokuta axis of the river and analyzed for Manganese (Mn), Lead (Pb), Nickel (Ni), Cadmium (Cd) and Zinc (Zn) using atomic absorption spectrometry. The moisture, crude protein, ash and fat content of the four fish species were analyzed using standard methods. The results showed varying levels of accumulation of the metals among the four fish species. Pb was detected only in Oreochromis niloticus while Mn was detected only in Chrysichthys nigrodigitatus. Except in a few cases, Pb and Ni in muscles of Oreochromis niloticus and Parachanna obscura respectively, the liver and gills accumulated more metals than the muscles. The concentrations of the metals in all cases were beyond regulatory limits by International Standards. All the fishes had high moisture content between 75 and 80 %, while fat was the lowest nutrient (0.88–1.89 %) in all fish species. The differences in proximate values were not significant among fish species. The findings in this study may be a reflection of the pollution status of the Ogun River with heavy metals while also portraying the risk associated with the consumption of fish from the river.

Studies on heavy metals and fish health indicators in Malapterurus electricus from Lekki Lagoon, Lagos, Nigeria

“…Analysis of the nutritional component of fish is vital in ensuring that it meets the food regulation requirements ( Watermann, 2000 ). With the exception of ash content where ( Ayanda et al. 2019 ) reported value of 3.95%, all other proximate parameters were similar to those reported in Malapterurus electricus sampled from Ogun River by the same author.…”

The Impact of Lake Ecosystems on Mineral Concentrations in Tissues of Nile Tilapia (Oreochromis niloticus L.)

“…Ash is the indication of overall mineral content in the samples [ 32 ]. From the ash and individual element concentrations, it is clear that muscle (fillet) is not a rich source of minerals.…”

Effects of Ascorbic Acid and β-1,3-Glucan on Survival, Physiological Response and Flesh Quality of Cultured Tiger Grouper (Epinephelus fuscoguttatus) during Simulated Transport in Water

“…The threshold cycle (Ct) values were obtained from each sample after finishing the program. Ash, fat, moisture content, and total protein were measured according to Ayanda et al [40].…”