"Aye," the old man grunted towards some glittering pieces of rock.
"Is that gold?"
"'Salmon swallows it. River's fu' o'gold. Mak' twa hunner every day." With that, he landed a salmon, extracted a gold nugget from its mouth, then threw the fish back.
"Can I try?" the tourist asked.
"I'll want compensation fur ma lost earnins," the old man said.
Next day, the tourist returned, handed over two hundred pounds and caught nothing. There was no gold or salmon; merely a conjuring trick that earned two hundred pounds daily.