Radioactive waste disposal sites used in the past have been found to be leaking low levels of radionuclides from containers placed on the sea bed. The potential exists for food chain transport of radionuclides from deep ocean regions to man, but the mechanisms by which such reverse transport upward can occur are largely unknown. When biological samples are analyzed, it is frequently found that their stomachs contain visually unidentifiable remains. Immunological gut analysis methods are useful in identifying such remains. The ability of antibodies to discriminate among proteins of different organisms depends on the degree to which a given antiserum cross-reacts with antigens from each organism. The ability of antisera to shallow water taxa to descriminate among deep-sea taxa was tested in hopes that these antisera could discriminate among higher taxonomic levels of deep-sea organisms. Preliminary tests using protein extracts of mid-water planktonic animals were successful and revealed high affinities among shallow-water and mid-water species of the same taxon. It is concluded that the immunological method may provide higher-order taxon information for predator-prey interactions among deep-sea organisms. This level of discrimination may provide data which could not be gathered using traditional methodologies.