Following up this article..Fukushima is going to start selling marine products
Plutonium 239+240 were measured from fish samples taken on 6/21/2011. They were preserved being frozen. Analysis was done by National institute of radiological sciences. Data about Plutonium 238 and 241 are not published.
They fished the fish offshore Onahama port, where is about 54km from Fukushima plants. (120 ~ 300m deep under sea.)
Because none of the other nuclides exceed the safety limit of food, they were probably distributed to the markets.
Iori Mochizuki