TOKYO — The first seafood caught off Japan's Fukushima coastline since last year's nuclear disaster went on sale Monday, but the offerings were limited to octopus and marine snails because of persisting fears about radiation.

Octopus and whelk, a kind of marine snail, were chosen for the initial shipments because testing for radioactive cesium consistently measured no detectable amounts, according to the Fukushima Prefectural (state) fishing cooperative. They were caught Friday and boiled so they last longer while being tested for radiation before they could be sold Monday.

Flounder, sea bass and other fish from Fukushima can't be sold yet because of contamination. It was unclear when they will be approved for sale as they measure above the limit in radiation set by the government. The government is testing for radioactive iodine as well, but its half-life is shorter than cesium and thus is less worrisome.