The Greenland shark doesn't urinate, per se, having no urinary tract.
Hence, when being prepped for hkarl, the shark is first left to rot in a gravel pit for weeks or months, depending on the season, so as to allow the most toxic of the flesh to decay and fall off.
Apparently, the finished product still has an overwhelming "hint" of ammonia.
Oh, and as far as the eyes, the shark goes blind earlier on, thanks to the parasite visible in the eye in the picture of post #5.
It has evolved a highly developed sense of smell to hunt with.
Oh, and the upper/lower teeth are completely different. One set grabs, while the other saws on the horizontal axis.
Good grief. Live and learn. It sounds horrible. http://www.meemalee.com/2010/12/hakarl-rotten-shark-worst-thing-i-have.html