Seeing that few survivors remained of this isolated and precious "national treasure" fish, all of which could be wiped out by an unexpected cold spell, it was not enough to simply patrol the river and to educate citizens. The main effort to restore the salmon population became managed breeding.
因此，除了進行溪流巡邏、給予社會大眾環境教育，人工繁殖，即成為尋回國寶魚的首要工作。