Tuna and billfish are highly migratory species, with their habitat and
migratory pathways often crossing the Exclusive Economic Zone of
different countries. The extent of population structure, habitats and
behavior of these fishes are emerging management and conservation issues
requiring the attention of fisheries scientists. Tagging programs are
widely recognized as important tools for understanding the population
dynamics, dispersal patterns and fisheries interactions of fish
populations. The objective of this project is to conduct tagging of main
commercial species of billfishes, black marlin, striped marlin, blue
marlin and tunas, and tune like included yellowfin tuna, bigeye
tuna and skipjack tuna in waters off Taiwan. These results can increase
understanding of the population dynamics of billfish and tuna in eastern
Taiwan. These will be the important input parameters for the stock
assessment and scientific references on setting management strategies.