In my very first fort I faced a sturgeon, which ate my whole miner when poor thing went to get some water from nearby river. (Yes, we had no booze in early spring, right before caravan)
Sturgeon got the pick stuck in his tail, and river turned red with blood of Bomrek Bardumkel (I will remember this name forever, I suppose)
Then my fisher went to... well... catch fish, and sturgeon ate him too. After that Sturgeon got the name (which I do not remember)
Good thing was that in that time I got another pick from caravan and managed to make a well inside fortress, not flooding it in the process, surprisingly.
And when I decided to engrave the hall with a well, on one of the walls I found the engraving of The Sturgeon striking a menacing pose, and Bomrek Bardumkel in a fetal position.
"What a picture" I thought to myself.
I requested a statue, and the statue came to be Horrifying Mr.Sturgeon himself. I have put it near the well.
Then I discovered ability to engrave furniture, and two tables of six came engraved with Mr. Sturgeon killing Bomrek and Mr. Sturgeon killing Urist McFisher.
Those tables were to be put in the same hall, also.
Guess, who was found laying dormant in the depth of reservoir under the well?
And who have instantly eaten another dwarf which suddenly fell into the well?
Anyway, I supposed that this became something like a Shrine of Horrifying Mr. Sturgeon.
Engravings on the walls and tables, statues, and the Well of Death, which serves for sacrificial drops of screaming meatbags to please The Sturgeon...
The fortress died of thirst. I have not managed to get a booze production running, and dwarves were too scared to get water from well, because Sturgeon was swimming on the surface all the time.
With a copper pick stuck in his tail...