There's a pretty good tuna salad made from mashed chickpeas, mayo, powdered kelp, and a number of other things. I don't have a recipe handy but if you google "vegetarian tuna salad" you'll find a bunch of different recipes. Just look for one that seems similar to the way you like your tuna now.
There was also a product called Tuno but I think I heard that had been discontinued. May Weh (I think that's spelled right) makes a variety of veggie fish analogs as well as various other faux meats. Their website is vegieworld.com, just one 'g'. I don't believe I've ever had their fish but their spare ribs are to die for.
at 4:04 PM on Sep. 27, 2009