The Eastern Marine Biology Research Center of the Fisheries Research Institute, Ministry of Agriculture, is dedicated to advancing the understanding and conservation of marine resources in the waters off eastern Taiwan. Among its major initiatives, the Satellite Tagging and Release Program has become a key focus in recent years. The eastern offshore region, shaped by the powerful Kuroshio Current, is home to abundant migratory species such as tunas and billfishes—an area recognized as an important fishing ground both domestically and internationally. Yet, despite their economic and ecological importance, many aspects of these species’ migratory routes, diving patterns, and environmental preferences have long remained unclear.

To uncover these mysteries, the Center applies cutting-edge satellite tagging technology. Researchers carefully attach satellite tags to large migratory fish—such as tunas and billfishes—while ensuring that the process does not harm the animals. The fish are released immediately after tagging. Throughout their journey, the tags record valuable information including swimming paths, diving depths, water temperatures, and surrounding environmental conditions. Once detached at a programmed time, the tags float to the surface and transmit the collected data via satellite back to the research team.

These data provide an unprecedented “fish-eye view” of the ocean, enabling scientists to better understand how these species navigate Taiwan’s surrounding waters:
• how their migration patterns shift with seasons,
• how ocean temperature and currents influence their distribution, and
• how deep-sea environments shape their daily behavior.

Insights from this program support not only academic research but also the development of sound fisheries management and conservation strategies, helping to ensure the long-term sustainability of marine resources. The findings are also shared with international scientific organizations, contributing to global stock assessments of highly migratory species and strengthening Taiwan’s role in international marine research.

The Center will continue expanding its tagging efforts, applying new techniques and including more species. Through science-based research and long-term monitoring, we strive to better understand the ocean and safeguard its biodiversity for future generations.