Ah yes, the good old days of 1946. Japan was a ruined, beaten nation, humiliated after being forced to surrender at the conclusion of the Second World War. Hiroshima and Nagasaki were radioactive wrecks, Tokyo and many other cities devastated by more conventional bombing. The economy was ruined, the nation's infrastructure was ruined.
The Japanese people were starving. How to feed them until the nation's agriculture could be restored? The occupying powers (USA, UK, Australia etc... where does that sound familiar?) decided that the solution was to feed 'em whale!