[Illustration: _RAT. A lightly anesthetized, wild trapped rat is weighed
and measured prior to marking it, taking a blood sample, and releasing
it in a controlled ecosystem._]
[Illustration: _FISH. Fisheries biologist with a large jackfish caught
off Engebi Island, Eniwetok Atoll._]
[Illustration: _COCONUT CRAB. Measuring the radioactivity of the shell
of a coconut crab caught on Bikini Island._]
[Illustration: _GEESE. Banding wild geese to study environmental effects
of radionuclides on wildlife and possible entry of radionuclides into
the human food chain._]
[Illustration: _PLANKTON. An ingenious plankton trap is placed in a
river as part of a long-range study of radionuclide uptake by aquatic
organisms._]
[Illustration: _SKATE. A clear-nosed skate being monitored by fisheries
personnel to gather data on accumulation of radionuclides in its blood
and tissues._]