The observations made in “BRAVO" and other large bomb craters indicate virtually no coral or reef fish recovery. Coral colonization is obviously inhibited by the abundance of fine sediment and the steep unstable slopes of the crater walls (45-60°). The bottom of the craters could not be observed but were deeper than 100 feet to 150 feet. Recent observations in the lagoons of Bikini and Enewetak Atolls (Colin et al in press) suggest that callianassid Shrimp may be common in the bottom of the deeper Bikini craters. Reef fish populations were very reduced due to lack of food or shelter, and the few fish seen were aggregated near a few small ramose corals (Acropora) and beyond the upper lip of the craters. lip of the craters. The most common alga was Halimeda beyond the upper The lagoon shorelines of all islands and reefs between Aomen and Bikini seemed disturbed, possibly by shifting sands or by recent high wave activity from the south. To a lesser extent the lagoon sorelines between the southern end of Bikini and southern Eneu were also disturbed, and large piles of coral rubble and shingle were noted just off the lagoon edge of the interisland reef flats between the two islands; these deposits may be accumulating from periodic heavy wave action, either from the lagoon or ocean side. Coral abundance was low except on the side of pinnacles and patch reefs offshore from the atoll reef rim or islands. Fish populations, however, were large, especially edible species of snappers, groupers, jacks, squirrelfish, and surgeonf ish. The ocean reef flats opposite Bikini and Eneu Islands and the reefs between the islands appeared to be healthy and representative of similar reefs reported at Bikini by Wells (1954) and elsewhere in the Marshalls. All these reefs show a predictable sequence of zonation; starting from the ocean reef. edge the following major ecological zones were reported along all sites observed: 1) coralline algal ridge; 2) a highly productive filamentous /turf algal zone on the outer reef; 3) a mixed coral and filamentous algal zone at midreef; 4) a dead coral and thin sediment (or a scoured reef) zone at the back reef, and a thick sediment or rubble zone beyond the back edge of the reef flat. Many major groups of reef fishes were seen on the reef flats including parrotfish and surgeonfish in the front side and goatfish, rabbitfish, and mullet near the backside. In addition, subtidal beachrock formations around all the islets and islands (including Bikini and Eneu) were primarily sites for schools of surgeonfish, goatfish, rabbitfish, mullet, and sea perch, and suitable for easy capture by thrownet at low tide. Giant clams and oysters were also common on some of the interisland reef flats. The most common reef corals on the flats included Palythoa, Pocillopora, Montipora, and Acropora in the front wave washed zones, and the brain coral! Favia and microatolls of Porites and Heliopora in tne back reef zones. Greater development of live coral lagoonward from the lagoon edge of the reef flat was inhibited by sand and rubble deposits. Large growths of the filamentous blue green algae Lyngbya were reported along many lagoon reef slopes and reef flats between aoe and Bikini Islands. This algae is probably seasonal and may be a good indicator of disturbed environments, possibly caused by periodic heavy wave action from the south (lagoon), shifting sand, or reduced water clarity near the shoreline or lagoon reef edge. D. I000140 CULTURAL RESOURCES.