In Situ bioassays are toxicity determining techniques applied to or designed for use under real world conditions outside of the control of the laboratory. A number of plants and animals, domestic and wild, are used in situ to measure and monitor mutagenesis, carcinogenesis and other biological endpoints; for example, growth, nitrogen fixation, excretion of urinary δ-aminolevulinic acid, blood cell abnormalities, etc. The organisms include corn, soybean, spiderwort, white footed mouse, wild house mouse, mudminnow, white croaker and brown bullhead fish, sea urchin and mussel.