The effects of chronic irradiation on the breeding performance of the guppy, Poecilia reticulata (Osteichthyes:Teleostei).

The effects of chronic irradiation on the life-time breeding performance of the small tropical fish, Poecilia reticulata, have been investigated at mean dose-rates of 0.17, 0.40 and 1.27 rad hour-1. The total fecundity was markedly (P less than 0.001) reduced at all dose-rates owing to a decrease in mean actual brood-size and an increase in temporary and permanent infertility. Minor progressive changes in the interbrood time with age and dose-rate were noted. The neonatal death-rate, incidence of abnormalities, and survival and sex ratio of the offspring were unaffected by irradiation. The brood-size data have been used to derive estimates of the dominant lethal mutation rate which are of the same order as those determined for mammals. Histological studies indicate that functional sterility is not necessarily dependent on the destruction of the gonads, and it is possible that radiation effects on pituitary function are responsible for much of the observed infertility.

[1]  B. Blaylock.  The fecundity of a Gambysia affinis affinis population exposed to chronic environmental radiation. , 1969, Radiation research.

[2]  C. L. Turner.  REPRODUCTIVE CYCLES AND SUPERFETATION IN PŒCILIÏD FISHES , 1937 .

[3]  R. Sievert,et al.  Book Reviews : Recommendations of the International Commission on Radiological Protection (as amended 1959 and revised 1962). I.C.R.P. Publication 6. 70 pp. PERGAMON PRESS. Oxford, London and New York, 1964. £1 5s. 0d. [TB/54] , 1964 .

[4]  S. A. Beach,et al.  The effect of acute X-irradiation on the development of the plaice Pleuronectes platessa L. , 1971 .

[5]  K. Bonham,et al.  Effects of Low-Level Chronic Irradiation of Chinook and Coho Salmon Eggs and Alevins , 1964 .

[6]  E. Rasch,et al.  Chronology of spermatogenesis and spermiogenesis in poeciliid fishes , 1969 .

[7]  J. Schröder.  X-ray-induced mutations in the poeciliid fish, Lebistes reticulatus Peters. , 1969, Mutation research.

[8]  H. Newcombe,et al.  Major congenital malformations from irradiations of sperm and eggs. , 1967, Mutation research.

[9]  A. D. Welander,et al.  X-Rays and Temperature: Combined Effects on Mortality and Growth of Salmon Embryos , 1971 .

[10]  H. Newcombe,et al.  Dose-response relationships for yields of major eye malformations following low doses of radiation to trout sperm. , 1972, Radiation research.

[11]  R. Ichikawa,et al.  Effects of Tritiated Water on the Embryonic Development of Two Marine Teleosts. , 1974 .

[12]  V. Schultz,et al.  Radioecology of Aquatic Organisms , 1966 .

[13]  Foster Rf,et al.  The effect on embryos and young of rainbow trout from exposing the parent fish to X-rays. , 1949 .

[14]  D. Woodhead.  The assessment of the radiation dose to developing fish embryos due to the accumulation of radioactivity by the egg. , 1970, Radiation research.

[15]  J. White.  FRACTIONATED DOSES OF X-RADIATION: A PRELIMINARY STUDY OF EFFECTS ON TELEOST EMBRYOS. , 1964, International Journal of Radiation Biology and Related Studies in Physics Chemistry and Medicine.

[16]  W. J. Meredith.  Report of the United Nations Scientific Committee on the Effects of Atomic Radiation , 1967 .