魚類の生殖せんおよびはい発生に対する放射性核種の影響

Abstract

In this short review, the abnormal embryogenesis, and the changes in hatchability of eggs and in gonads of fish kept in contaminated water with radionuclides are dealt with.Many reports on the effects of radionuclides on the hatchability of fish eggs have been published. However, there is a marked divergence among these results. In our experiments, the process of embryogenesis was rather radioresistant, when eggs were irradiated with internal radiation from radionuclides incorporated into the eggs. It has been shown from estimation of absorbed dose that insufficient size of dose to produce low hatchability was given to the embryos during their embryogenesis. The damage of the gonads of fish was observed when fish was kept in water containing such low concentration of radionuclides that normal embryogenesis proceeded. It seems that the gonad of fish is a critical organ for the assessment of the effect of radionuclides on the fish population.