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Pollution reaches shellfish primarily through waterborne contaminants, such as chemicals, heavy metals, and pathogens, which are often washed into oceans and coastal waters from rivers, industrial discharges, and agricultural runoff. Shellfish filter-feed by drawing in water, allowing them to absorb these pollutants directly into their tissues. Additionally, pollutants can accumulate in sediments where shellfish live, further increasing their exposure. This bioaccumulation poses health risks to both the shellfish and the humans who consume them.

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