17903
Depending on the time of year that fathead minnows were collected , there were differences in the condition factor , gonadosomatic indices , liver somatic indices , and secondary sexual characteristics of fathead minnows ( in males ) from Demonstration Pond when compared to the fathead minnows from the reference sites .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None