Why can we not eat white croaker from the red zones and can eat them from the yellow zone? Don’t the chemicals mix in the water?
The concentration of DDTs and PCBs in the water and sediment drop off the further you are from the areas that are most contaminated with DDTs and PCBs. Fish sampling and testing over the years have shown that white croaker caught from the red zone areas have much higher levels of DDTs and PCBs than white croaker caught from the yellow zone. This is mainly due to the fact that white croaker feed directly off the bottom of the ocean floor where the chemicals are located. White croaker is also a fatty fish and DDTs and PCBs tend to build up in fatty tissues. Data from fish sampling and testing so far has found most white croaker in the yellow zone to be less contaminated than those in the red zone. In general, following the consumption recommendations for the different zones can help reduce your exposure to the chemicals in fish.
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