Fishing from the banks or small craft is common along the Charles. With catches from the Charles from Natick to Boston the public is advised not to eat carp, and for non-pregnant, non-nursing adults, to limit large mouth bass consumption to no more than twice a month. Children and pregnant or nursing women should eat nothing from the Charles River. Both cautions are due to PCB and pesticide contamination. Up river from Natick, similar advisories are in effect for all fish on account of mercury, chlordane, and DDT in the fish.