Subject: How 'Derris elliptuca' and 'Milletia taiwaniana' plants are used as poison

Hi!
I read in a book about the plants "Derris elliptuca" and 
"Milletia taiwaniana", it says that the juice from their roots can be used 
to poison fish, and if the correct dosage used, the fish will come back 
alive again. It only said a little about it in the book. I find it very 
interesting, and tried to look for information on how and why it works, 
but found almost nothing! Can you help me with this question?! 
Thank you!! 

Re: How 'Derris elliptuca' and 'Milletia taiwaniana' plants are used as poison