mt om t Gysail, Introduction me ee - During the weapons wenng program of Operatiua Cantie at Bakinm and Eniwetok Atolls in the apriag of 19394 the Appiied bisneries Laboratory of the University of Wastingtua carried out studies on the uptaze of radioactive materiale ia a variety Wf aquatic and terrestrial plants and anmals In additi nite the programmat« studies, exploratory studies ala: were a. comtinucd includsag @ study of the reef algae Coltections of algae from near the Marine Biological laboratory m > Parry |Islana) Emwetvuu Atoll, indicate that @ enell red aiga (Aspete gops:s) has a remarkable affinsty for isdine as measured by (Re uptanr of p31 immediately folluwiag weapon detomations at tne Pacific Proving Gr vuad -% Colle: oa of Mate rial immediately folluging the March |. (954 experiment at Hikia Atoll. \t Wes UBeerved that the bac aground level of radivectivity om ine reef 4 the seaward side Wi Parry isiand ned iacreased Moet uf the ages gre tag of the reef had only signtly tugher readiags than the De. agr wan ieve. However the level for Asperagupeie tazilormis (Deliic) (. line eam Her vey. a delicate, branching red alga, was uneupectediy 1.gh a ——— a Radivassays were made of algae collected at Parry and Bogembogo laiande during March. are given in Table I. April, and May, 1934 The reeults 4 these otudine