魚類における放射性核種の蓄積機構に関する研究-I : 鰓吸収時のストロンチウム・カルシウム差別率について

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To investigate the behaviour of strontium and calcium at the gill absorption of fishes, gill-perfusing experiments were conducted using the fresh water or sea water adapted eel, Anguilla japonica and following results were obtained. 1) Discrimination against strontium in favour of calcium was observed at the gill absorption of these minerals. 2) The strontium-calcium discrimination factor (DFgill absorptive) expressing this discriminating rate was 0.74 in case of fresh water eel. In this case, the fresh water of external medium contained 100 mg. per 1000 ml. of medium. 3) In marine eels, on the other hand, this DFgill absorptive was found as 0.67 and this heigher rate of discrimination than that observed in fresh water eels seems to be caused by the pretty high concentration of calcium and strontium in sea water. In this case the sea water of the external medium contained 498 mg. Ca and 12 mg. Sr per 1000 ml. of medium. The authors wish to express their cordial thanks to Assoc. Prof. NAKAMURA and Mr. S. KASAHARA, Fisheries Experimental Station of Tokyo Univ. and members of Atsumi Fish-breeding Co. Ltd., for the facilities they gave to authors during the collection of marine eels. They are also indebted to Mr. Y. ENOMOTO, National Institute of Radiological Sciences, for his technical assistance.
公益社団法人日本水産学会の論文