ABSTRACT
Water, sediment and shellfish were collected
from four locations (Slaughter, Aboluma, Okwujiagu and Oginiba) of the Azobie
creek of River state Nigeria and were evaluated for microbiological, heavy
metals, nutritional composition and physico-chemical parameters. Bacterial
isolates consisting of ( total heterotrophic bacteria and hydrocarbon
utilizing bacteria count) and fungal
count (total fungal count and hydrocarbon utilizing fungi count) were analysed
from the shellfish and its habitant
(water and sediments). Data generated were subjected to analysis of variance
(ANOVA) and mean were separated using fishers minitab 2017. The highest total
coliform counts obtained from Slaughter
(control) had a value of 1.52 during wet season and 1.23x105 CFU/g
in dry season and in Aboloma it was 1.53x105CFU/g for wet season and
1.12x105 Cfu/g for dry season in periwinkle . These decreased to an acceptable limit of 0.02 x10 5CFU/g
at different time intervals of 24-96h of soaking and depuration. Total
heterotrophic bacteria count in periwinkle had the highest count in control at
Slaughter, Oginigba and Abuloma at a value of 0.48 and 0.33X105
CFU/g This was reduced to acceptable limit of 0.12 x 105 CFU/g.
Similar trend occurred in oyster sample at the same locations. Total
hydrocarbon utilizing bacteria and fungal count in oyster had the highest count
of 9.80 during wet season and 8.90x105 CFU/g for dry seasons at
Slaughter and Abuloma at 9.17x10 CFU/g for wet season and 7.12x105 CFU/g
during dry season. Oginigba did not record any bacteria count. Total
faecal count was reduced at different
time interval of 24-96h to an acceptable limit , while for depurated at
different time intervals during dry season, it was not reduced. This could be
as a result of the different depuration methods. The same trend was observed in
periwinkle although it was not fast as in oyster. The different bacterial
profiles are probably attributable to industrial activities of the sites. The
moisture, protein, fat, crude fiber and ash content were the major constituents
which had been considered in evaluating the nutritional value of these species.
Soaking shellfish had no effect on the
proximate composition except in fat where it increased the fat and protein content in the control.
Physio chemical parameters varied among different locations. The levels of Cd (
0.00-2.5ppm) recorded in these samples were higher than the maximum recommended
limit of 2-0ppm in sea food. The value of Cr recorded was between 1.50 – 2.0
ppm and was found to be higher than the maximum recommended limits of
0.15-1.0ppm.The levels of Pb (0.001-2.50) recorded in this study was higher
than the recommended limits of 2.0ppm in
some locations. The micro nutrient (K, Fe, and Zn) were above the permissible
limits for human consumption as recorded by the Food and Agricultural
Organization. Depuration had little effect on
contaminant while soaking had no effect at different locations and
different time intervals. Depuration performed
AUGUSTINA, N (2023). Effect of depuration and soaking on the heavy metals, nutrient composition and microbial load of shellfish harvested from polluted creek of rivers state, Nigeria.. Mouau.afribary.org: Retrieved Nov 13, 2024, from https://repository.mouau.edu.ng/work/view/effect-of-depuration-and-soaking-on-the-heavy-metals-nutrient-composition-and-microbial-load-of-shellfish-harvested-from-polluted-creek-of-rivers-state-nigeria-7-2
NNENNA, AUGUSTINA. "Effect of depuration and soaking on the heavy metals, nutrient composition and microbial load of shellfish harvested from polluted creek of rivers state, Nigeria." Mouau.afribary.org. Mouau.afribary.org, 22 Mar. 2023, https://repository.mouau.edu.ng/work/view/effect-of-depuration-and-soaking-on-the-heavy-metals-nutrient-composition-and-microbial-load-of-shellfish-harvested-from-polluted-creek-of-rivers-state-nigeria-7-2. Accessed 13 Nov. 2024.
NNENNA, AUGUSTINA. "Effect of depuration and soaking on the heavy metals, nutrient composition and microbial load of shellfish harvested from polluted creek of rivers state, Nigeria.". Mouau.afribary.org, Mouau.afribary.org, 22 Mar. 2023. Web. 13 Nov. 2024. < https://repository.mouau.edu.ng/work/view/effect-of-depuration-and-soaking-on-the-heavy-metals-nutrient-composition-and-microbial-load-of-shellfish-harvested-from-polluted-creek-of-rivers-state-nigeria-7-2 >.
NNENNA, AUGUSTINA. "Effect of depuration and soaking on the heavy metals, nutrient composition and microbial load of shellfish harvested from polluted creek of rivers state, Nigeria." Mouau.afribary.org (2023). Accessed 13 Nov. 2024. https://repository.mouau.edu.ng/work/view/effect-of-depuration-and-soaking-on-the-heavy-metals-nutrient-composition-and-microbial-load-of-shellfish-harvested-from-polluted-creek-of-rivers-state-nigeria-7-2