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The effects of endosulfan , an organochlorine pesticide regularly used in Niger Delta ecological zone , were examined and also its effects on various biochemical parameters in the serum of Oreochromis niloticus , a dominant fish species in Nigeria .
 Chemical: endosulfan; Chemical: organochlorine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: endosulfan; Chemical: organochlorine