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Fishing down the food web is the process whereby fisheries in a given ecosystem , " having depleted the large predatory fish on top of the food web , turn to increasingly smaller species , finally ending up with previously spurned small fish and invertebrates . "
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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