Pascal Kobeh / Sicklefin lemon shark (Negaprion acutidens) in the lagoon of Picard Island, Aldabra, Seychelles, Indian Ocean.

Pascal Kobeh / Sicklefin lemon shark (Negaprion acutidens) and Blacktip reef shark (Carcharhinus melanopterus) with people standing in the water, and a RIB in the background, lagoon of Picard Island, Aldabra, Seych...

Pascal Kobeh / Sicklefin lemon shark (Negaprion acutidens) close up of head on coral reef, Moorea Island, Society Islands, French Polynesia, Pacific Ocean.

Pascal Kobeh / Sicklefin lemon shark (Negaprion acutidens) surrounded by fish on coral reef, Moorea Island, Society Islands, French Polynesia, Pacific Ocean.

Pascal Kobeh / Two Sicklefin lemon sharks (Negaprion acutidens) in the lagoon of Picard Island,Aldabra, Seychelles, Indian Ocean.

Doug Perrine / Sharptooth lemon shark (Negaprion acutidens) accompanied by juvenile Golden trevallies (Gnathanodon speciosus) Shark Reef Marine Reserve, Beqa Passage, Viti Levu, Fiji. (Non-ex).

Luciano Candisani / Lemon Shark (Negaprion acutidens), Rocas Atoll, Brazil

Norbert Wu / Lemon Shark (Negaprion acutidens) portrait, vulnerable species, Bahamas, Caribbean

Norbert Wu / Lemon Shark (Negaprion acutidens) pair, vulnerable species, Bahamas, Caribbean

Norbert Wu / Lemon Shark (Negaprion acutidens) photographed by diver, vulnerable species, Bahamas, Caribbean

Norbert Wu / Lemon Shark (Negaprion acutidens), vulnerable species, Bahamas, Caribbean

Norbert Wu / Lemon Shark (Negaprion acutidens) swimming over sea fans, Bahamas, Caribbean