The 4th time i embarked and a dwarf was 'struck down by carp'.
The first three times were just wtf moments, but by the fourth i realised YOU SHOULD FEAR THE KING OF BEASTS
Only had one dwarf taken down by carp; for a long time my only interaction with carp was trying to lure them into my drowning traps, but since I learned how to drain rivers quickly and easily, my third order of business on embark is "Drain the rivers and drown the carp".
On topic: I was attempting to test the magma-proof-ness of green glass, particularly grates and bridges, by building a pump stack to bring magma up above ground level, from a pipe three levels below ground BTW, letting it flow through a glass grate, and into a cistern with a bridge for a floor. If the grate and bridge didn't melt by the time I'd cycled the bridge twice, I'd call it a success and begin using green glass any place I needed magma-proofing. Got everything built, bridges and gear assemblies linked to levers, and set it going. A moment later, I realized that the top pump, the one that was supposed to pump magma into the cistern, was pumping the wrong direction. Rather than pumping magma into a contained area, it was spraying magma over my windmills, which started to catch fire. Face, meet palm.
Fortunately, I have a new scheme, which should require fewer materials and can probably be built just in my obsidian farm.
Edit: Tested scheme, and everything worked fine, glass bridge, grate, and floodgate all worked with no problems, the second time I ran the test. The first time, everything again worked just fine and jim-dandy, because I'd left TEMPERATURE off; presumably a wooden floodgate with non-bauxite mechanisms would have done as well.