Two Taiwanese longline fishing fleets, the large scale longline fleet of above 100 GT and small scale longline fleet of below 100 GT, are operating in the Indian Ocean.. In 2018, the total catches were 43,132 tons for large scale longline fleet and 35,975 tons for small scale longline fleet, respectively. In 2018, there were 45 observers dispatched to the fishing vessels in the Indian Ocean. And there were 19 observers deployed on large-scale tuna longliners with 2,111 fishing days observed and 26 observers deployed on small-scale tuna longliners with 1,870 fishing days observed.