2.7 miles east-northeast of Belle Island, and thus contributed the greatest amount of radioactivity to the Belle area. was however, There residual radioactivity present from previous atomic weapons detonated at Bikini Atoll and at Eniwetok. Reef fishes were collected in the vicinity of Belle Island by using rotenone, hook and line, or spear in depths ranging from a few inches to about l2 feet. Almost all of the collec- tions were made on the seaward side of the island in Area F (Fig. 1) in a habitat containing approximately equal amounts of coral and sand. The area is typical of the reef of the northern portion of the atoll except that it sustained a certain amount of physical damage because of its proximity to the shot. Attempts were made to confine the specimens analyzed to those fish which were typical residents of the Belle area, such efforts were not entirely successful. but The fish collected during the first month after Nectar shot consisted mainly of goatfish and mullet, species which move along the north reef from island to island. Typical reef residents such as grouper, damselfish and surgeonfish appeared to be scarce during this period. In all, 34 different collections were made in 1954 and 1955 which included 693 specimens, these representing 57 species and 22 families of fishes. However, only 9 species from 9 fami- lies were consistently present in the collections (Table 1 and Appendix). The collections and treatment of data were similar to those in earlier investigations by the Applied Fisheries Laboratory. For complete details see WT-616 (UWFL-33). The specimens were