By-products are generated during fishing and fish processing and contain nutrients and heavy metals. The nutritional value and heavy metal concentration of the edible portions and by-products of two shrimp species that are consumed in Cameroon were evaluated in this study. After collection of the shrimp samples (Penaeus notialis and Callianassa turnerana), their edible components and by-products were gathered. Minerals, heavy metals, carotenoids, amino acids, and fatty acid concentration were measured. Significantly (p < .05) higher protein (13.40 to 14.32%) and ash (5.68 to 13.70%) are found in edible parts (EP) and by-products (BP), respectively. C. turnerana had a considerably (p < .05) greater lipid (2.06 to 13.63%) and carotenoid (6.85 to 21.74 μg/g) content than P. notialis. Contents of minerals and heavy metals were found as follows: Ca > P > Na > K > Mg > Fe > Zn > Cu > Mn and Cd > Ni > Pb > Hg > As > Cr > Co and the highest concentrations were found in the by-products. According to the amino acid profile, the two main essential and non-essential amino acids were glutamic acid and lysine. Palmitoleic (7.08 to 15.97%), oleic (16.82 to 23.08%), eicosapentaenoic (3.95 to 5.83%), and docosahexaenoic (2.11 to 10.40%) acids were the most abundant fatty acids in these shrimps.
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Manz et al. (2026) studied this question.
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