Photo taken on June 15, 2018 shows a family watching a sea turtle and fishes in CretAquarium, Crete, Greece. CretAquarium, one of the largest modern European aquariums, is specialized in species and ecosystems of the Mediterranean Sea. (Xinhua/Stefanos Rapanis)

Photo taken on June 15, 2018 shows a Sand Tiger Shark in CretAquarium, Crete, Greece. CretAquarium, one of the largest modern European aquariums, is specialized in species and ecosystems of the Mediterranean Sea. (Xinhua/Stefanos Rapanis)