Didn't know nems could kill a big fish that's easily. As I was not planning for it, I didn't read much about it. Now I am sure not to have one. 5 days, hopefully poison dilute since (not sure it is the proper verb).5 days that I’ve been able to determine- if I could get him to eat more then one or two bites of food a day I think he would make it. We have fed him everything.