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In the present study , nutrient addition led to an increase in MeHg flux primarily by enhancing the biomass of emerging insects whose tissues were contaminated with MeHg , whereas fish decreased MeHg flux primarily by reducing the biomass of emerging insects .
 Chemical: MeHg; Chemical: MeHg; Chemical: MeHg
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: MeHg; Chemical: MeHg; Chemical: MeHg