oxygen uptake and filtration rate as animal health biomarker in lamellidens marginalis lamarck the freshwater bivalve l marginalis was experimentally exposed to 10 and 30 ppm concentrations of cdcl2 to examine filtration rate oxygen uptake and glycogen level of liver and gills for health assessment for their reuse in the reclamation of cadmium intoxicated environments in situ experiment was also performed for better appraisal of the filtration rate in the lake oxygen uptake in the treated group exceeded that of control by 1522 during the early 24 hr after cadmium exposure but followed an essential decline 2330 thereafter the reduction of filtration rate ranged from 1262 in laboratory to 8385 in field trials at the tissue level glycogen content was reduced by 6172 in liver and 5263 in gill in both tissues glycogen content was inversely proportional to the cadmium contents of the animal critical appraisal of data suggests that the threshold values of cadmium in gill and liver were 5080 microgg dw for oxygen uptake and 5060 microgg for filtration rate because of marked reduction of these parameters beyond the values of cadmium it is concluded that filtration rate oxygen uptake of the freshwater bivalve l marginalis can be used as biomarker for animal health assessment and for possible reuse of the stock animals