Fish bodies & immune system , resistence

 

APRIL 08, 2011 Fri New York Fish Quickly Evolve PCB Resistance The Atlantic tomcod, a species of fish in New York's Hudson River, has evolved resistance to PCBs over the course of just 50 to 100 generations, rather than thousands or millions as might have been expected. Research suggests that resistance is due to a genetic mutation that was formerly rare but rapidly became more common because it protected the fish from the toxic pollutants, Isaac Wirgin of New York University School of Medicine says in Chemistry & Industry. Source: Evolving PCB resistance in fish