I'm looking for any paper related in heavy metals depuration methods from your country, especially in Bivalve studies. Do you have any suggestions, please?
Pb, Cu, Cd, CH3-Hg or Es are frequently found in the body of mollusks, especially digestive glands. There are many strategic vectors to control the presence of those heavy metals and other environmental contaminants (dioxins, PCbs, PHAs). They may be systematized in two main routes: one preventive and one other curative.
1st - Assessing the preventive pathway – the cockles must me produced and recovered from non polluted production zones (pre-classification of tidal and under tidal areas not polluted by chemical effluents to establish its productive vocation)
2nd- When the first way is not available (Class B zone), captured or collected cockles may be transferred to the, so called, “Aquatic transposition zones” recognized as not polluted and remaining there for the enough time to depurate (not only biological but also chemical contaminants). This procedure must be previously tested to correlate time of mollusks residence and the reduction rates of contaminants.
Dear Endar,
Cockles like quiet transition waters and muddy flats, which quite naturally tend to accumulate toxicants. Cockles are good bioaccumulators but elimination is also relatively efficient, even though not that too fast. If you need to depurate metals out of them, e.g., for some experiment, I strongly suggest that you bring them to the lab and rear them for a month or so in good quality water and clean sediment. A fine sand should do the trick. Make sure that your system is filtered, preferably with UV (if not a dynamic system), since they tend to be infected easily. Nemertea may be problematic parasites. Keep your stocking density relatively low. See the attached publication. Perhaps it will help.
Cheers
Article Evaluation of the potential of the common cockle (Cerastoder...
I suggest FAO Fisheries Technical paper n.511
Bivalve depuration:fundamental and practical aspects by Lee, Lovatelli, Ababouch, Rome,Italy 2008
Www.fao.org/docrep/011/i0201e/i0201e00.htm
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