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68145 
Journal Article 
Comparative toxicities of trace metals on embryos of the giant clam Tridacna derasa 
Soria-Dengg, S; Ochavillo, D 
1990 
Yes 
Asian Marine Biology
ISSN: 1011-4041 
DART/TER/95001569 
7 
0 
161-166 
eng 
One-hour old embryos of the giant clam Tridacna derasa were exposed for 72 hours to CuCl2, CdCl2, SnCl4, Pb(NO3)2 and As2O3 solutions at concentrations of 0.1, 1.0, 5.0 and 10.0 ug/L for each metal. The number of embryos which developed to the D-veliger stage and the shell-length of the surviving larvae were noted. Copper proved to be the most toxic of the metals tested, causing 50% mortality at an added concentration of 0.1 ug/L. Cadmium followed Cu in toxicity, with 50% mortality at 1.0 ug/L added metal. Lead was less toxic than Sn and As at 10 ug/L, but more toxic than As at 5.0 ug/L. Copper-treated larvae had greater shell lengths; high mortality in the treatment probably favoured growth among the survivors. Smaller shells of larvae treated with Pb may have resulted from the delay and inhibition of embryonic development. Generally, T. derasa embryos proved to be more sensitive to Cu, Cd and Pb as compared with some temperate bivalve species used in bioassay studies. 
Ecology; Biochemical Studies-Minerals; Pathology; Toxicology-Environmental and Industrial Toxicology; Developmental Biology-Embryology-General and Descriptive; Developmental Biology-Embryology-Morphogenesis; Public Health: Environmental Health-Air; Invertebrata; Pelecypoda