Fish mutate in mucky river

Fish have mutated to live in a polluted river in the US.

After nearly 30 years of dumping from General Electric plants upriver in New York, the Atlantic tomcod which dwell in the mucky Hudson River have evolved to survive its toxic conditions.

Scientists were baffled after they carried out tests on the species which technically should have been died from the levels of pollutants.

However, their evolution is nothing to celebrate because they are passing the poisons higher up the food chain.

Isaac wirgin who studied the tomcod said: "You've got this fish that would normally be dead from PCBs or dioxin. It's alive and it's carrying around all this PCB and dioxin and it gets eaten."