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A first - time detailed histopathological screening was performed on grooved carpet shell clams collected from commercial shellfish beds in distinct coastal ecosystems of the Southern Portuguese coast : two parted sites within an impacted estuary ( S ( 1 ) and S ( 2 ) ) , an inlet channel of a fish farm at a considered pristine estuary ( site M ) and a site allocated in a clean coastal lagoon ( A ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None