12700
The downstream carp and crabs had higher mean bioaccumulation factors and biota - sediment accumulation factors for Cd but lower mean biota - sediment accumulation factors for Zn than the upstream carp and crabs .
 Chemical: Cd; Chemical: Zn
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: Cd; Chemical: Zn