indicate some of the problems that can bo prolitay ly in this arena, and also somo of tho probloms that can makinz use of the fact that the area is contaminated active materinai--in cthor words, using these radioactive matorial: as a teol in placing the movement of materinis in the throvan various live cycles, Gur principal objectives have boon to determine the dosree n° to which particular plants and animals concontrate active materinis or to waich they are contaminated nature of such contamination; that is, whether 1% surrace contamination, or whothev it is material ‘ actually been motabolizned and whieh is contained in tho tissues. Associated with these ovjcetives, we also wo Ceternine the inumediate seurce ovr the sourcos of activity to the various organisms; that is, are ¢ getting the matorial from wWiat they cat, or are they Getting it divectly Irom tho water. As far as tha fish arc concorned end most of importancs only duving the very short period arte et brates, tho matter of getting it from the wator is probably of he initial contanination, Another objective is to determine what the redistribution of the radioactivity is as time goes by in the lagcon., Tren, —---- finally, sone linited studics on ronopulation, ro- duvasion of arens that have boon cacimated,