Based on records of transactions, Charles Chang judges that Wu was a major middleman in the dolphin meat trade, buying from fishermen for resale to seafood restaurants in Yunlin and Chiayi, on Taiwan's west coast.
從帳冊和往來紀錄中，張有長斷定，吳萬教應該是大盤商，將貨主要批發到西海岸雲林、嘉義的海產店。