It's not always easy to have access to fresh seafood. Growing up in Minnesota, the land of 10,000 lakes, we had plenty of fish in the summer. But come winter the closest I would get to fish would be a Filet-O-Fish at McDonald's. 
One good way to have a bit of seafood during the week is to stock up on some items like this shijimi su-pu (shijimi soup). Little corbicula clams with wakame in a clear broth. Simply boil with some hot water and it's a nice last minute addition to any meal. This pack cost 525 JPY for 20 servings. It tastes good and is great to have on hand. Easy ways to add more to the soup is to include soft tofu or green onions.
