Late last month the Yomiuri News on-line reported the following:
After noting that there was only one lake smelt made available as the sample for inspecting the radioactive material, and that the checking for the safety of the lake smelt in the Haruna lake in Takasaki city, Gumma could not be carried out, the Haruna lake fisherman's cooperative association (union president Masahiro Noguchi) decided on the 28th that the ban would not be removed this season.
Union members had tried to capture a pond smelt for about 20 times since September last year, but to no avail; the personnel from the prefecture and the city also joined on that day; 85 people hang down the fishing line for about 5.5 hours from above the ice, and was able to get one fish at last.
The fisherman's cooperative association expressed that "there was no such poor catch at least in the past ten years. The reason for that could not be figured out at all."
According to the fisherman's cooperative association, 200 g (50 - 100 fish) was needed for the sample inspection, and the fisherman's cooperative association gave up the self inspection.
Haruna Lake was near the urban area, to fish pond smelt above the ice from a hole was a popular leisure in the winter. Usually, it would be held from January to March when the lake was frozen completely.
I am also interested to know why there was so few lake smelt this year.