Target hazard quotient evaluation of selected trace elements in highly consumed crustacean species in Lagos, Nigeria

Rasheed Olatunji Moruf

doi:10.4025/actascibiolsci.v43i1.53052

Abstract

Crustaceans are known for their trace element bioaccumulation abilities. Muscle tissues of lagoon crab, marine crab, pink shrimp and mantis shrimp marketed for consumption in Nigeria were analyzed for Mn, Fe, Cu, Zn, Hg and Cr levels using standard methods. Muscle levels in mg kg-1 of Mn (0.03±0.00 in lagoon crab), Fe (0.072±0.01 in mantis shrimp), Cu (0.344±0.01 in lagoon crab) and Zn (0.073±0.00 in mantis shrimp) were significantly different (p<0.05) from their corresponding values in other examined crustaceans. The mean values of Cr and Hg were not significantly different across samples. The estimated daily intake of trace element (mg person-1day-1) revealed that Hg (0.000001) in marine crab contributed the lowest daily intake while Zn (0.000226) in lagoon crab contributed the highest daily intake. Total hazard quotient (THQ) values for the trace elements followed descending order of Hg > Cu > Zn > Fe > Mn > Cr. Lagoon crab showed the highest total hazard index among the organisms with 44.80 %, while the least was observed in mantis shrimp with 13.30 %. It is concluded that, as far as human health is concerned, the mean elemental levels in the muscle tissues of the organisms examined pose no danger (THQ < 1).

Highlights

Crustaceans are invertebrates with segmented bodies, protected by chitinous shells and include barnacles, crab, crayfish, krill, lobster, prawn, shrimp, and woodlice (Moruf, 2020)
Sample collection Samples of fresh aquatic crustacean species; Lagoon crab, marine crab, pink shrimp and mantis shrimp were obtained from point of sales with source from domestic waste contaminated sites (6o31′ 44.35′′N, 3o24′ 00.28′′E) of the Lagos Lagoon in Nigeria (Figure 1)
Crab legs are often buried in surficial sediments and might adsorb metals from sediment more

Summary

Introduction

Crustaceans are invertebrates with segmented bodies, protected by chitinous shells and include barnacles, crab, crayfish, krill, lobster, prawn, shrimp, and woodlice (Moruf, 2020). The production of crustaceans typically farmed in coastal aquaculture is dominated by marine shrimp, which is an important source of foreign-exchange earnings for a number of developing countries in Asia and Latin America (Food and Agriculture Organization of the United Nations [FAO], 2020). Different invertebrates accumulate different trace elements to different degrees and accumulated concentrations vary greatly at tissue, organ and body levels (Wang, Xu, Sun, Liu, & Li, 2013). To take one taxon as an example, tissue and body concentrations of trace elements vary greatly in crustaceans, even in the absence of anthropogenic input of trace metal contaminants (Wang et al, 2013)

Methods

Results

Conclusion