@ 1979, by the American Society of Limnology and Oceanography, Inc. Midultraviolet (UV-B) sensitivity of

The sensitivity of all life stages of laboratory-cultured Acartiu clausii to various fluences of UV-B radiation was evaluated. Organisms were irradiated on a rotating turntable beneath FS40 sunlamps and “deluxe white ” fluorescent lamps. Copepods were randomly assigned to treatments utilizing a randomized complete block design. Least-squares regression analysis was performed between surviving fraction and fluence for all treatments administered to each age group and also between the offspring:survivor ratio and fluence for treatments adminis-tered to the oldest age group, which was composed of equal numbers of males and females. Results indicated an inverse relationship between surviving fraction and UV-B exposure. Reproductive capability of the surviving organisms was also negatively affected. Stratospheric ozone filters incident so-lar ultraviolet (UV) radiation so that only the longer wavelengths of the total UV spectrum reach the earth’s surface. UV radiation in the 290-320-nm waveban