How do pesticides get into oysters?
Walking along estuaries in NSW, one finds that most oysters have been 'harvested' by very hungry people. And no, not by oystercatchers.

"Pesticide residue from farms and towns is ending up in fresh oysters. Most of the herbicides, insecticides and fungicides we found are used routinely by farmers, land managers and council workers."

"Four pesticides – atrazine, diuron, hexazinone and metolachlor – were found in concentrations above safe environmental limits for fresh and marine water.
The sheer number of different pesticides we found in oysters was perhaps the biggest concern for lovers of oysters. Five of these – pebulate, vernolate, fosetyl Al, benomyl and prothiofos – have residue limits set at zero for meat."
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https://theconversation.com/pesticide-residue-from-farms-and-towns-is-ending-up-in-fresh-oysters-219395
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