stinky snail problem

Question
Okay so we're all 10th graders in chemistry. We had have to do an experiement with snails and nitrates. we were wondering what are the acceptable levels of nitrates that snails could survive in? and when they die, are there any signs of death?

Answer
Hi guys,
 Unfortunately I do not have any experience with snails so there really isn't anything I can offer to help.  When a snail dies, typically the "foot" extends out of the shell more than normal.  

-- Ron C.  
  rcoleman@cichlidresearch.com
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