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Crayfish were exposed to 1 mg l ( - 1 ) ( 14 ) C - ethion and the concentrations of ethion and its possible degradation products were measured in water and different organs of the crayfish over both the exposure and recovery periods .
 Chemical: ( 14 ) C - ethion; Chemical: ethion
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: ( 14 ) C - ethion; Chemical: ethion