Resumo

VILLEGAS, Liz et al. Sublethal effects of cadmium on the caribbeanpearl oyster Pinctada imbricata (PTEROIDA: PTERIIDAE) Röding, 1798. Saber [online]. 2015, vol.27, n.1, pp.39-45. ISSN 1315-0162.

The effect of sublethal doses of cadmium 0.05 mg/L in the Caribbean pearl oyster Pinctada imbricata was evaluated in three different sizes: juveniles 10-20 mm, 40-45, and adults >75 mm. Static bioassays were conducted for 7 days with a renewal of metal on the fourth day of exposure. At the end of the bioassay, the replacement of the shell, mass of tissue, oxygen consumption and RNA/DNA ratio were evaluated. No significant effects of cadmium at sublethal concentration were observed in the tissue mass, RNA/DNA ratio and oxygen consumption in each of the sizes evaluated. However, at this concentration of cadmium a significant decrease was observed in the shell replacement in juveniles. The use of shell replacement of P. imbricata juveniles is recommended as a biological indicator in toxicity testing.

Palavras-chave : Akoya pearl oyster; toxicity; RNA/DNA; oxygen consumption; Golfo de Cariaco.

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