ELEMENTAL DISTRIBUTION IN ORGANS OF MEDAKA, Oryzias laptipes, BURDENED WITH X-RAY IRRADIATION AND SALTY WATER (Part II)

Balance of essential elements in organisms might be changed by environmental stresses. Small teleost fish, Medaka, was burdened with X-ray irradiation (total dose: 17Gy) and salty water (70% NaCl of sea water). These stresses are not lethal dose. Essential elements in various organs in the fish were measured by PIXE method and compared with a control fish to determine the effect of two types of the burdens on the elemental contents. P, K, Ca and Br are examined in brain, eye, liver, ovary, spleen and intestine. P and K did not change their concentrations with both of the stresses. Ca concentrations increased under both stresses in the brain, eye, liver and spleen, and decreased in the intestine and ovary. Br concentrations of the organs largely changed in the case of salty water breeding. Micro-beam scanning PIXE provided elemental mapping of thin section of Medaka eye with STIM imaging.