Trace Element Accumulation in Macrobrachium rosenbergii(Decapoda:Palaemonidae)from South Vietnam

摘要

We analyzed accumulation of 22 trace elements in abdominal muscle,abdominal exoskeleton and the hepatopancreas of the giant river prawn Macrobrachium rosenbergii,an indigenous freshwater species from South Vietnam.Giant river prawns are cultured commercially and fished in the wild.Samples(n=25)were collected from Hochiminh City and its surroundings areas(SKEZ:South Key Economic Zone)and from the Mekong Delta between 2003 and 2005.Highest accumulations of essential(Cu,Se,Mo)and toxic elements(As,Ag,Cd,Hg)in hepatopancreas tissue suggest that this is a major storage and detoxifying organ.The elevated concentrations of Mn,Sr,Sn,Ba and V in the exoskeleton might be due to their chemical similarity to Ca,which they may replace in constituents of the shell.Rubidium and Cs,which are chemically comparable to K,accumulated in muscle.Concentrations of Cs and Pb in muscle and Sr in exoskeletpns from the SKEZ were higher than those from the Mekong Delta,whereas the trend was reversed for Cr,Se and Sb in muscle,Mo,Sb and Tl in exoskeleton,and Se,Hg,Mo,Cd,Sb,Tl and Bi in the hepatopancreas.These differences in trace element concentrations in the prawns may reflect differences in the levels of industrialization between the two regions of South Vietnam.