mecheg neva listed in Table 1. The higher value of the pair gwas from acoarse mesh net 5 times und from a fine mesh net 5 times on the ash weil jay bisis and the same wac true on the wet weight basis. au.ll of the 2:ases t..e wet bisis. In only x38 tie same mesa size hi;sher on both the ash and All of this tndicates randomess, or in other words, . lae« of copresaviuw Leveeen mesn size and specific activity. ct Le our earlier reports, beta vadicactivity of plankton as de- om Loe in methane! ow crunters nes been reported on the wet basis Go that tae omecifis crtivity cf ¢lankton may be compared with that of oc lbac ctunstances, A fom ky Peem TMT. Tus involves astemnuinsg to drain water uni- une poarnkwton ga ples at the time of rreparing the plates. voirmine water conteny cf vie nlanxtonie organisms causes uncer~ vena fy eyoluaiine the ancuit of wet plankton being radio-assayed. Iv vag Soown (UWFI-53:20) thas i: results were based on the amount GP ,danctonie asn rztvner tain on whe amount of wet plankton, the veldit tility in radlonetivity of replicated tows was reduced to only one tna. the v.lue ottauined on the wet basis. 3imtloriv, the present data for Rongelap Atoll were more con- S'svueit «3 an ash than on 2 wet basis. Lofton Sie vo values for pilred tows oceurred in the 1956 collections, as geen in Tatle i. At Kabelin, the ratio between the two values was oni 2.6 0) the -3h basis, a iy 4.4, The greatest disparities be- an Posts, teeowariorilits put 3.9 on the vet basis, Lut 8.6, wet basis, and at Rongelap I. so that here, as at Eniwetok, Ate ids only oar as gers on the ash as on the wet basis. Se. 104.