13354
In fish exposed to a salinity challenge of 29ppt for 2 weeks , no significant effect was recorded in blood osmolality , Na ( + ) / K ( + ) - ATPase ( NKA ) activity , Na ( + ) and Cl ( - ) concentrations .
 Na ( + ), K ( + ), Na ( + ), Cl ( - )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Na ( + ), K ( + ), Na ( + ), Cl ( - )