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