This study analyzed the establishment trend of fishery start-ups during the Japanese occupation period. In terms of company types, limited partnership companies and stock companies were the representative types of fishery start-ups from 1911 to 1939. It implies that many fishery start-ups were founded in such a way that many people could invest in capital to facilitate the mobilization of capital. Furthermore, during that period, there were some differences in the establishment number and the capital amount of start-ups by fishery sectors. In the primary fishery industry, fishing companies were the most established, and their average capital was the highest in the 1920s, which was due to the powerization of fishing boats. In the secondary fishery industry, the fishery processing sector had the largest number of start-ups, and its average capital was higher than that of the rest of the secondary fishery sectors because of the processing boom of sardine oil and fertilizer in the 1930s. In the tertiary fishery industry, the number of seafood distribution start-ups was greater than the number of other tertiary fishery sectors’ start-ups, however, their average capital was very small.