Before 1978, my country's three major traditional marine industries were marine fishery, marine salt industry and whatnot.

Before 1978, my country's three major traditional marine industries were marine fishery, marine salt industry and marine transportation industry.

Before 1978, the level of science and technology was relatively low, and it was impossible to develop high-tech industries and could only develop traditional industries.

Fish, shrimp, shellfish and algae are caught and cultured in the ocean, seawater sun salt is used (Changlu Saltworks, Yinggehai Saltworks, Taiwan Butai Saltworks, etc.), and the ocean is used to develop marine transportation.

Especially the transportation of bulk goods between countries.