vertebrates, South East Asia, Pacific, species decline, Underwater, Blue Planet, Chondrichthyes, Indo Pacific, Sharks, Coral Triangle, biodiversity, Coral Reef, Seascape, South-east-asia, predator, Swimming, Reefs, Tropical, Shark Fin Soup, top of the food chain, PNG, pristine waters, elasmobranch, Papua New Guinea, Seascapes, Blue, Marine, Reef, Shark, shark finning, Diversity, Asia