18364
Nickel concentrations causing lethality to 50 % of the fish ranged from 2 mg / L in moderately hard freshwater to 66 . 6 mg / L in 36 ppt saltwater .
 Chemical: Nickel
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: Nickel