ДЕТОКСИКАЦИЯ СВИНЦА МОЛЛЮСКОМ MERETRIX LYRATA ПРИ ИСКУССТВЕННОМ РАЗВЕДЕНИИ В УСЛОВИЯХ ВЬЕТНАМА

Abstract

Polluting of the environment by wastes of social-economic activities, industrial, agricultural and household sources is considerably dangerous for artificial breeding of clam Meretrix lyrata in the mouth of the Bach Dang (Vietnam) because of heavy metals in clam organisms accumulated in dangerous concentrations. Accumulation and excretion of lead in Meretrix lyrata was studied under laboratory conditions. There were conducted a series of experiments on breeding of Meretrix lyrata and its exposure to water with different levels of lead (C = 0.003; 0.05; 0.1; 0.3; 0.4; 0.6 mg/l). Lead content in Meretrix lyrata was analyzed after 10, 15, 20, 25, 30 days. In 10 days after the exposure of Meretrix lyrata to clear sea water it was marked that concentrations of lead were not excreted, about 30% of it remained in clam bodies regardless of initially accumulated amount of Pb. It has been stated that concentration of Pb in Meretrix lyrata in all tanks (except C = 0,6 mg/l) gradually increased with the duration of exposure. In 25 days of exposure of individuals in water with concentration of C = 0.6 mg/l, about 20% of Meretrix lyrata individuals died, after 30 days died 100% individuals. The results obtained can be assumed as the basis for investigating lead accumulation and its excretion by clam Meretrix lyrata organisms grown in artificial conditions.