Fish can become contaminated with radiation by a damaged nuclear plant that releases radiation and radioactive particles. If radioactive water is being dumped into the ocean, fish who happen to be swimming in these waters will be passing water through their mouths and into their gills thereby becoming contaminated with radiation.
Radiation presence in fish can occur through direct contact as suggested by mire187, but it is more likely that the fish feed on the contaminated marine plant life and ingest the radiation. Radioactive isotopes such as iodine 131 degrades in water over the course of a few weeks, but radioactive isotopes like Cesium 137 have a half-life of thirty years. The potential for contact and/or ingestion can be lasting.
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