Oil decontamination of bottom sediments using Limnodrilus hoffmeisteri (Oligochaeta: Tubificidae)

Abstract
Using aquatic worms (Oligochaeta: Tubificidae) for oil decontamination of bottom sediments has been first considered. In a set of experiments on Limnodrilus hoffmeisteri Claparede, 1862, worms survived the exposure to oil content as high as 16.72 g/kg; they died of natural causes. Vigorous silt agitation by worms (bioturbation) was observed: the silt layer thickened as compared with that in reference aquaria without worms. Besides, it tended to thicken with increasing oil content of sediments. Within 30 days Limnodrilus hoffmeisteri reduced oil content by 1.20 to 1.72 times, or by 16.67 to 41.90% (a<0.05), compared with that in reference aquaria.