17904
In comparison to reference fish , lower concentrations of 11 - ketotestosterone were measured in the plasma of male fathead minnows collected from Demonstration Pond in June 2006 and July 2007 .
 Chemical: 11 - ketotestosterone
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: 11 - ketotestosterone