Accumulation of cadmium in the hepatopancreas of the common prawn Palaemon serratus (Pennant) and ultrastructural changes m hepatopancreatic cells were examined after exposure to 3 cadmium concentrations (5, 25.50 ppm) for 44 h. Accumulation of cadmium Ions in 50 ppm solution was 800 % higher compared with control specimens. Absorptive and fibrillar cells (R-and F-cells) in the hepatopancreas were affected by cadmium ions at the ultrastructural 1evel.The ultrastructural changes observed suggest impairment of ion transport, absorption and proteln synthesis.
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