Keywords
crabs
heavy metals
bioaccumulation
human consumption
Abstract
Proximate analysis and heavy metal composition of Callinectes amnicola (12) and Portunus Validus (12) sourced from the Makoko fish market were analysed between April and May, 2017. The carapace length of combined sex Callinectes amnicola ranged between 8.9 and 10.8cm (9.85±0.95 cm) with the weight ranged between 21 and 80g (50.5±29.5g). The carapace length of the combined sex of Portunus validus ranged between 12.0 and 13.5cm (12.75±0.75cm) with the weight ranged between 39.0 and 80.0cm (59.5±20.5g). Proximate composition of Male C. amnicola, female C. amnicola, Male P. Validus and female P. validus revealed mean % crude protein of 34.31±5.60%, 32.55±7.55%, 30.71±1.01% and 29.09±1.12% respectively. C. amnicola Cd values ranged between 0.4489ppm (Male) and 1.1177ppm (Female) with a mean value of 0.7833±0.33ppm. P. validus Cd values ranged between 0.4593ppm (Male) and 0.6399ppm (Female) with a mean value of 0.5496±0.09ppm. C. amnicola Co values ranged between 0.1508ppm (Female) and 0.1537ppm (male) (0.1523±0.001ppm). P validus Co values ranged between 0.1400ppm (female) and 0.1719ppm (Male) (0.1560±0.02ppm). C. amnicola Cr values ranged between 0.478ppm (Male) and 1.1483ppm (Female) (0.8132±0.34ppm). P. Validus Cr values ranged between 0.9575ppm(Female) and 0.9733ppm(Male) (0.9654±0.008ppm). Heavy metals in male C. amnicola in decreasing order was Fe>Zn>Cu>Cr>Cd>Co>Pb. Decreasing order in female C. amnicola was Fe>Zn>Cr>Cd>Cu>Co>Pb. P. validus male heavy a decreasing order of Fe>Cr>Zn>Cu>Cd>Co>Pb and female P. validus in decreasing order was Fe>Zn>Cr>Cd>Cu>Co>Pb.
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