Wow, so you too had the "fish with fins" things? I thought I was seeing things in my toilet. WTF?? They looked a bit elegant floating in the clear water (because of fasting) of the toilet bowl. The wings or fins were huge compared to the narrow body, but they were also quite fragile. Mine did not look old either. They looked ready to pan fry. Hahaha. And I had at least 2 bowl movements of nothing but fish and fins before starting the irrigations. When they moved down the track they felt very strange. The body senses them and needs to eject them even though their mass is quite small.