Metal accumulation in commercially important velvet crab (Necora puber) in the Orkney islands, Scotland

Crustaceans account for ∼25 % of seafood consumption worldwide, however global concerns related to seafood safety have been raised, especially in terms of metal contaminants. Edible tissue concentrations of metals were examined in commercially important velvet crab Necora puber sampled around the Orkney islands, Scotland. Tissue concentrations of non-essential metals (cadmium and lead) were compared to permissible levels (< 0.50 mg.kg⁻¹ wet wt., European Commission). Cadmium concentrations were below this in all crabs sampled, whilst lead was above this limit in two N. puber individuals from one location. No correlation was observed between metal concentrations and other biometric factors, including the presence of black spot shell disease and claw deformities. Sex differences in tissue levels were observed with female crabs accumulating more cadmium, copper, manganese, and cobalt. This study provides relevant baseline data regarding metal accumulation in N. puber to inform future, recommended monitoring studies.