ate some fish,intestinal cramps,green stools why?

[rucnateb]

I ate some salmon last sunday night,hours later that night i had intestinal?cramos from above my belly button to my lower abdomen that would come and go.no diarrea (diarrhea). they have not stop since then but they do go away and come back every time i eat or lie flat on my back.havent lost weight so far,and my stools are green,no blood on them so far.could this be food poisoning although i dont have any nausea.i have gastritis due to h.pylori infection,or maybe colitis cause my lower abdomen feels a little sore.if anybody have any inputi will deeply appreciate it.