Ralph Pace / Silky Shark (Carcharhinus falciformis), Galapagos Shark (Carcharhinus galapagensis), Dusky Shark (Carcharhinus obscurus), and Black-tip Shark (Carcharhinus limbatus) group working with Yellowfin Tuna...

Ralph Pace / Silky Shark (Carcharhinus falciformis), Galapagos Shark (Carcharhinus galapagensis), Dusky Shark (Carcharhinus obscurus), and Black-tip Shark (Carcharhinus limbatus) group working with Yellowfin Tuna...

Wim van den Heever / Dusky Shark (Carcharhinus obscurus) solitary shark patrols the deep blue waters off Port St Johns, South Africa

Chris & Monique Fallows / Dusky Shark (Carcharhinus obscurus) with wound on fin, feeding on sardine shoal, East London, South Africa.

Chris & Monique Fallows / Dusky Shark (Carcharhinus obscurus) with wound on fin, East London, South Africa.

Chris & Monique Fallows / Dusky Shark (Carcharhinus obscurus) Mozambique Channel, Indian Ocean.

Doug Perrine / Dusky shark (Carcharhinus obscurus) Gulf of Mexico off Louisiana, USA. Non-exclusive.

Alex Mustard / Dusky shark (Carcharhinus obscurus) investigating a scuba diver. Cat Island, Bahamas. July

Jeff Rotman / Public dissection of Dusky Shark (Carcharhinus obscurus) Natal Sharks Board, Umhlanga, South Africa

Jeff Rotman / Diver with anti-shark POD examines Dusky Shark (Carcharhinus obscurus) caught in anti-shark net. Durban Beach, Natal Sharks Board, Umhlanga, South Africa Model released.

Ralph Pace / Silky Shark (Carcharhinus falciformis), Galapagos Shark (Carcharhinus galapagensis), Dusky Shark (Carcharhinus obscurus), and Black-tip Shark (Carcharhinus limbatus) group working with Yellowfin Tuna...

Ian Coleman / Illustration of Dusky shark (Carcharhinus obscurus), Carcharhinidae. Endangered / threatened species.