By National Council on Radiation Protection and Measurements
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Extra resources for Effects of Ionizing Radiation on Aquatic Organisms: Recommendations of the National Council on Radiation Protection and Measurements (N C R P Report)
Example text
8; Section 2; Blaylock and Trabalka, 1978; Woodhead, 1984; Anderson and Harrison, 1986). Effects on aquatic organisms, not necessarily detrimental when evaluated in the context of population dynamics (Blaylock and Trabalka, 1978), have been 26 / 3. 9; note caveats about results on natural populations). 5). Once again, however, the limitations imposed by the relatively small number of studies conducted precludes a judgment that such effects will not appear in systems chronically irradiated at dose rates CYTOGENETIC AND GENETIC EFFECTS micronucleus frequency had returned to baseline levels. It should also be noted that the sensitivity of the assay depends upon using larvae a t the stage when rapid division is taking place in the peripheral blood erythrocytes. , 1986)mention that they examined the blood of two fish Brachydanio rerio and Cyprinw carpio every other day for a period of 4 weeks (dose not reported) and failed to detect a significant increase in micronucleus formation. Similarly, Hooftman and de Raat (1982)found the micronucleus assay to be insensitive for detecting chromosome damage in the peripheral blood erythrocytes of Umbm pygmaea after ethyl methanesulphonate exposures. Recruitment in fish populations is not often related to the total number of eggs and offspring produced, but more typically to the availability of food for the young fish (except at the edges of the geographic range of a species, where environmental conditions are of major importance) (IAEA, 1976). , fishing) or to exposures to other environmental stressors. 6-15 mGy d-I, no significant impacts on these or similarly exposed populations would be predicted. This has, in fact, been observed for White Oak Lake popula- 28 1 3.
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