in your experience if a stingray does not ship well example possibility of ammonia poison how long can this last before its the end of there fight and they die. i am experiencing one ray that is on its way out. it has been eating until two days ago and has never regained original color has stayed dark in color. so i know there has been something wrong from the first week. i have had this ray for about 4 weeks. i feel this is the initially risk of any wild caught ray we just don't know 100% on health condition we can just go on assumption of appearance and possible history witch most likely is a history of a couple weeks witch is not much to go on. it is uncomfortable to watch a slow death but unfortunately this happens.