18365
Nickel toxicity to F . heteroclitus decreased linearly with increasing salinity ; however , Ni toxicity to K . marmoratus was only lowered by salinities above 6 ppt , demonstrating potential physiological differences between the 2 species when they are functioning as freshwater fish .
 Chemical: Nickel; Chemical: Ni
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; Chemical: Ni