10 Fish Concentrations The mullet stomach contents consisted of homogenized carbonate material and microbenthos while the stomach contents of the snapper contained fish parts, crustacea and some unidentified organic material. Table 2 shows a large difference between the wet/dry ratio of the stomach contents from the two fish. The ingested food contents of these fishes are from very different components of the lagoon environmert. This observation supports the description of the different feeding habits of the two species (Hi 60). Th e 2394-240. Pu concentration associated with the mullet stomach contents was 5.0 pCi/kg dry weight. This concentration is very close to the value of the average lagoon sediment concentration (6.2 + 1.3 pCi/kg) The average 238 Pu/ 2394240, u ratio in the surface sediment (0.032 + 0.008) and stomach contents (0.020 + 0.005) are also in good agreement. The wet/dry and ash/dry weight ratios of the stomach contents and sediment were identical. The similarity in plutonium concentrations, isotopic ratio and weight ratios indicate that the stomach contents of the mullet consists largely of benthic sedimentary material. The stomach content of the snapper, on the other hand, was found to contain a much lower concentrations of plutonium, more typical of the levels associated with the flesh of marine organisms. 95 Zr was detected in the viscera and stomach content samples of the mullet collected on 21 October 1976, The radionuclide was introduced to the aquatic environment sometime after 26 September 1976. Generally low 9575 concentration factors for marine fish species are measured in