6871
Grass shrimp were collected in May 2011 from two marsh sites with average salinities of ~ 3 . 0 ppt and 24 . 0 ppt .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None