When international fishing rights weren't so clearly delineated, Taiwan's deep-sea boats went around the world and brought back many precious deep-sea shells. Like Nanfang-ao, the long-range fishing fleet of Pingtung County's Tungkang earned quite a sum of foreign exchange on the shell trade. The two harbors--one in the north and one in the south--both made names for themselves in the world of shells.
大海的心跳在過去經濟海域並未明確劃分的年代，台灣的遠洋漁船繞著地球跑透透，因此帶回了許多深海珍貝；和南方澳一樣，屏東東港的遠洋漁船靠著貝殼也賺過一大筆外匯，一南一北兩大「貝港」相互輝映。