Exposure of sperm of the rainbow trout to ionizing radiation causes, in addition to major eye anomalies, gross malformations of the bodies of embryos. At the lower doses the observed yields of body malformations exceed those for the unirradiated controls but the difference falls short of statistical significance. At the higher doses the radiation effect is large and highly significant. Unlike the eye malformations, which increase in frequency in direct proportion with the radiation dose, the body malformations exhibit a disproportionate increase with increasing dose. Some of the malformations of fish embryos affect more than one part of the body, and in this respect resemble the multiple malformations and syndromes of human infants.

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