Justin McCurry & David McNeill talk to fishermen in the north and south of the country and find widespread alarm at depleted tuna stocks.

On a gloomy day pregnant with rain and the weight of past expectations, Nakamura Minoru is welcomed back to port in Iki-shi like a conquering hero. Three family generations, including Nakamura's father Toshiaki and newborn child Misaki wait ashore, smiles wide as his boat sails into harbor. Good for him, says a beaming Okubo Terutaka, head of the local fishing cooperative. That's wonderful to see.