I just woke up from a 4-hour nap. I was having a legitimate ASCII dream for a while, at least for the units; the non-living objects were displayed isometrically and looked like they do in stonesense, but I have never even downloaded it! There were only 4 dwarves on the units list and I was getting paranoid because I would see them conversing with others, and an engineer was running from some besieging force outside, a platoon of axemen. He ran into a cave and I thought he was a goner because the axemen would follow and kill him. They did, but attacked him one-by-one and he managed to kill a few. Amazing little bastard. Then the dream stopped being displayed strangely... but I also stopped following it mentally and can't remember much except something about blue elves like from Avatar... Maybe that's what those 'axemen' were supposed to be.
And I think you could breed the larger fish like carp and sturgeon, or sharks. If you like modding/cheating, you can make them [AMPHIBIOUS] instead of [AQUATIC], allowing you to take them from the water. Be sure to get them back in water when you want to change their behavior back to normal. Alternatively you could make an untamed wild fishery that funnels them into some chamber where they can be occaisionally separated out and suffocated under influence of air, allowing you to butcher the corpse. Think that was used on mermaids to get their valuable bones...