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A Re-Examination of the Toxicity Test for Water Pollutants HIRAOKA, Yukio HIRAOKA Yukio open access Toxicity test Water pollutants 490 In toxicity tests carried out in Japan, adult or young adult fish having relatively stable tolerance and relatively low sensitivity to various toxicants are usually used. However, in order to preserve the ecosystem, fish in the early stage of life, which are more sensitive to toxicants than adult or young adult fish, should be used as test organisms in the toxicity test. Medaka in the early stage of life were therefore exposed to 0.1 ppm Cd solution and their resistance to Cd toxicity was examined. As a result it was shown that resistance to Cd toxicity in medaka of early stage of life was steady from seven to twenty days after hatching. It is therefore suggested that medaka fry could be used as a test organism in toxicity tests. Hiroshima University School of Medicine 1985-09 eng departmental bulletin paper VoR https://hiroshima.repo.nii.ac.jp/records/2013040 4066399 0018-2052 AA00664312 Hiroshima Journal of Medical Sciences Hiroshima Journal of Medical Sciences 34 3 323 323 326 https://hiroshima.repo.nii.ac.jp/record/2013040/files/HiroshimaJMedSci_34_323.pdf 375.5 KB