The introduction of factory ships with stern slipways in 1925 substantially increased the number of whales taken per year. In 1937–38 alone, over 29,000 fin whales were taken. From 1953–54 to 1961–62, the catch averaged over 30,000 per year. By 1962–63, sei whale catches began to increase as fin whales became scarce. By 1975–76, fewer than 1,000 fin whales were being caught each year. In the North Pacific, over 74,000 fin whales were caught between 1910 and 1975. Between 1910 and 1989, over 55,000 were caught in the North Atlantic. Coastal groups in northeast Asian waters, along with many other baleen species, were likely driven into serious perils or functional extinctions by industrial catches by Japan covering wide ranges of China and Korean EEZ within very short period in 20th century. Migrations of the species into Japanese EEZ and in East China Sea were likely to be exterminated relatively earlier, as the last catch records on Amami Ōshima was between the 1910s and 1930s. After the cease of exploiting Asian stocks, Japan kept mass commercial and illegal hunts until 1975. Several thousand individuals were hunted from various stations mainly along coasts of Hokkaido, Sanriku, and the Gotō Islands.