Where can I find Fish TK in Riken?

Fish TK can also be found in these cities:

Aarau Balsthal Buchs Egerkingen Egolzwil Erlinsbach Gränichen Herzogenbuchsee Huttwil Langenthal Lostorf Murgenthal Oberkirch Oensingen Oftringen Olten Reiden Rothrist Schöftland Schönenwerd Suhr Sursee Unterentfelden Zell Zofingen

You can also find this in Riken:

Semolina Porridge Cake Vanilla Sugar Jelly Ice Cream Desserts Meat Products Lemonades Instant Coffee Pumpkin Seed Roll Canned Meat