Hi. Thanks for your query. Noted the history about a 44 year old male, otherwise healthy, eating raw tuna fish and white fish mahu mahu yesterday for dinner, not eating well lately and stressed out due to intense travel schedule, passed gases and oily yellow discharge, twice- wants to know why... The tune and other fish have very high oil contents and it is possible that when you had fish, the digestion would have been altered or the sort of irritable bowel one gets, the transit time would have been very fast not allowing the complete digestion and absorption of the oil hence passed in the stool. Hence do not worry unless you are a known patient of pancreatitis of gall bladder removal not allowing proper digestion of extra fat. You may get the stool tested and also an Ultrasound of the abdomen. Avoid such foods and beverages that contain too much fat. Take care..