Comparison of short-term cadmium poisoning in the shrimp Crangon crangon from the Baltic Sea and the shrimp Palaemon serratus from the Atlantic Ocean with cadmium bioaccumulation and malic enzyme activity in abdomen muscle

Shrimps were exposed to various concentrations of CdCl2 under laboratory conditions for 96 h. Although kept at the same Cd concentration but at different salinities – C. crangon in Baltic seawater (6 PSU) and P. serratus in Atlantic water (36 PSU) – the shrimps accumulated a Cd level in abdomen muscle which was much higher in the animals kept at the lower salinities than in those at the higher 138 D. Napierska, M. T. Thebault, J. Pempkowiak, E. Skorkowski ones. The same Cd bioaccumulation of ca 80 ng g w.w. of abdomen muscle were found in C. crangon kept in 0.2 mg dm of CdCl2 in Baltic seawater and in P. serratus kept in 2 mg dm of CdCl2 in Atlantic water. In both cases the NADP-dependent malic enzyme activity per g w.w. of shrimp abdomen muscle was higher by ca 150% in animals kept at a CdCl2 concentration close to LC50 as compared to the control groups.