I do agree that fish on the whole is a rather expensive commodity. I must admit, however, that I am a lover of fish and would buy it more often if it was not so expensive. Most of the fish that I can think of now, or that I buy, is very pricey. The cheapest fish that I buy is cod fish, or salt fish, as we call it here. When I am on a tight budget, I usually opt to buy this one. It goes very well with mashed potatoes, but I would also use it with rice or pasta. I usually make it in a sauce and then add it to the potatoes, rice or pasta. Salt fish cakes are a well-known delicacy over here, but we would normally use this as a breakfast meal. I don't remember ever tasting tuna fishcakes, but that sounds pretty good to me. When I use tuna, I would use the tin one with bread.