Researches from Aqua DTU (Technical University of Denmark) detect the activities of Bluefin Tuna in Skagen, Denmark, August 23, 2021. Those Bluefin Tuna swam back to the Danish sea area after disappeared for about 50 years. (Photo/ Agencies)
Researches from Aqua DTU (Technical University of Denmark) detect the activities of Bluefin Tuna in Skagen, Denmark, August 23, 2021. Those Bluefin Tuna swam back to the Danish sea area after disappeared for about 50 years. (Photo/ Agencies)
Denmark's Crown Prince Frederik takes part in a marking of Bluefin Tuna in Skagen, Denmark, August 23, 2021. Those Bluefin Tuna swam back to the Danish sea area after disappeared for about 50 years. (Photo/ Agencies)
