期刊
AQUATIC LIVING RESOURCES
卷 21, 期 1, 页码 57-61出版社
EDP SCIENCES S A
DOI: 10.1051/alr:2008012
关键词
metal accumulation; pollution; size effect; lead; clam; Dosinia exoleta
To protect public health, the European Commission established maximum levels of certain contaminants permitted in foodstuffs. The maximum amount of lead allowed in bivalve mollusc is 1.5 mu g g(-1) wet weight. In the Galician Rias, which are important areas of shellfish production in Spain, high levels of lead have been detected in the commercial bivalve Dosinia exoleta ( Veneridae). Given the environmental and socio- economical problems this could represent, Pb concentration was tested in D. exoleta from two R as, and the relation of lead accumulation with body size studied in detail. Implications for fisheries management are also discussed in this paper. Results showed a strong dependence of Pb accumulation on body size, with lead concentrations increasing exponentially with shell length. Larger animals presented a 5- fold increase in lead concentrations above the maximum permitted level. The size limit ( length beyond which D. exoleta should not be extracted for commercial purposes) was initially established at 40 mm; but a more comprehensive geographical study of Pb concentrations in individuals from 35 to 40 mm long revealed that this size limit was not protective enough, and 35 mm is proposed as a safer limit.
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