17900
The purpose of this study was to assess the reproductive development and health of a wild population of fathead minnows ( Pimephales promelas ) inhabiting an OSPW pond that has moderate concentrations of naphthenic acids ( ~ 10 mg / l ) .
 Chemical: naphthenic acids
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: naphthenic acids