[yuujirou]

not so much to contribute to the topic.. but more to relate my sympathies....
but i truly pity those with any allergies of any sort to food....
it is really such a shame to have an unavoidable restriction on your diet....
i, personally, would have no idea how i'd go about not being able to eat seafood...
there are so many wonderful things to try out there... >.<'''

but as most everyone has stated... katsuo is used quite heavily in japanese cuisine >.>''
it's the base for almost every broth or liquid.....
and in a place like japan, as i would imagine, it'd be pretty damned difficult to avoid consuming any form of seafood

perhaps you could learn some basic recipes using japanese ingredients and just cook for yourself?
honestly not the most delightful way to dine in another country... but hey... better safe than sorry eh? >.>'