Okay, I'm trying to embark in a hot/borderline scorching desert region with streams running around and magma pools/pipes scattered about. I tried to embark in one part of that region and found it infested with hippos and carp, so I tried again further south. It's the same region, but a different stream I think, or maybe I really am downstream on the same one. Anyway, I embarked on an area where two streams met and I found that there was 14 or so pages worth of hippos, milkfish, carp, some stingrays thrown in, and the usual camels (of which there are only 6 camels).
SO..... do I abandon or what? I have just embarked on the area and I want to set up a fort there, but not sure. I know I could use marksdwarves on the fish, but the wiki says that hippos are as dangerous ingame as the real ones.
Edit: Just to clarify, the milkfish and stingrays I'm not too worried about, but we all know the reputation of carp.
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Here is a crude (emphasis on crude

) diagram of where my dwarves are, the o is the wagon and the rest roughly shows the two streams. The horizontial one is at a higher elevation than the first, about 8 levels or so. Theres already dead carp at the bottom of the waterfall (had accidentially unpaused a second). The waterfall is bound to kill some of them as I don't think a hippo would survive the fall intact.