Reef Sharks of the Red Sea

Whitetip Reef Shark (Triaenodon obesus)

The whitetip is the reef shark most divers see first — and most often. It is small, slender, brown-grey, with a distinctive white tip on the first dorsal fin and the upper lobe of the tail fin (occasionally the pelvic fins too). The body shape is unusually slim for a shark — more pencil than torpedo. The second dorsal fin is unusually large, almost as big as the first, which is a key identification feature.

Identification

• Size: Maximum 2.13 m, but adults rarely exceed 1.6 m. Most individuals seen by divers are 1.2-1.5 m.
• Colour: Brown-grey dorsal, white ventral. Distinctive white tips on first dorsal, upper caudal lobe.
• Shape: Slender body, short broad snout, large second dorsal fin (key ID feature distinguishing it from other species).
• Teeth: Small, three-pronged ("tricuspidate") — used for grabbing small slippery prey.

Behaviour

Whitetips are predominantly nocturnal. By day, they rest on the sand under coral overhangs, in caves, or on ledges — sometimes piled on top of each other ("cuddle puddles"). By night, they actively hunt the reef, often working cooperatively to corner prey in coral crevices. Their flexible bodies and tough skin allow them to wriggle into tight spaces unavailable to other sharks. They are extraordinarily site-faithful — individual whitetips may return to the same resting cave for years.

Where to see them in the Red Sea

The whitetip reef shark was first scientifically described in 1837 by German naturalist Eduard Rüppell — and the type locality was the Red Sea. They are reliable encounters at virtually any reef site in Egyptian waters: house reefs, Hurghada day-boat sites (Sha'ab El Erg, Umm Gamar, Gota Abu Ramada), Sharm day-boat sites (Tiran straits, Ras Mohammed), and every offshore reef. Look for them sleeping at 10-25 m on sandy patches under coral.

Biology & conservation

• Reproduction: Viviparous (placental). Litter size 1-5, typically 2-3 pups. Gestation period over 5 months.
• Maturity: Females mature at ~1 m total length; males at ~82 cm.
• Lifespan: Estimated 16-25 years (Smith et al. 1998 estimate ~16 years; some longer-lived individuals recorded).
• IUCN status: Vulnerable (2020), declining.
• Threats: Coral reef degradation, targeted fishing for fins and liver oil, slow reproductive rate.

Blacktip Reef Shark (Carcharhinus melanopterus)

The blacktip reef shark is the shallow-water specialist of the three — and by far the most visually striking. Every fin is tipped in unambiguous black, with a particularly bold black tip on the first dorsal fin, often contrasted by a clear pale band immediately below. Combined with their habit of patrolling shallow reef flats (sometimes with the dorsal fin breaking the surface), they are the species most non-divers see while snorkelling or wading.

Identification

• Size: Maximum 1.8 m, typically 1.5-1.6 m. Smaller than whitetips on average.
• Colour: Yellow-brown to grey-brown dorsal, white ventral, with conspicuous black tips on first dorsal, pectorals, pelvics, anal fin and tail. A pale band runs below the black tip of the first dorsal — diagnostic.
• Shape: Stout build, short bluntly-rounded snout, oval eyes.
• Diagnostic feature: Black-tipped first dorsal with the contrasting pale band below.

Behaviour

Blacktips are shy and skittish. They have extremely limited home ranges — adults often stay on a single reef their entire lives, with movements measured in hundreds of metres rather than kilometres. They feed primarily on small reef fish, cephalopods, and crustaceans, and occasionally on sea snakes and seabirds. They are typically solitary but will aggregate around concentrated food sources. They can tolerate brackish water and have been recorded entering river mouths and (in some regions) freshwater.

Their shyness around divers is genuine — most blacktips will move away when divers approach, sometimes pacing the reef edge at a constant distance rather than allowing close approach. They become bolder around feeding (which is why their reputation includes occasional bites of waders in shallow water near beach fish-feeding).

Where to see them in the Red Sea

Blacktips prefer Hurghada-area sites with extensive shallow lagoons and reef flats — places like the shallow areas around Giftun Island, Sha'ab Sabrina, and the lagoons of Sha'ab El Erg. They are less common at Sharm sites where the bathymetry drops more steeply from shore. Look for them in 2-15 m on sandy lagoon edges adjacent to reef walls.

Biology & conservation

• Reproduction: Viviparous (placental). Litter size 2-4 pups. Gestation 7-11 months (longer in some regions).
• Maturity: Females 96-130 cm; males 91-105 cm.
• Lifespan: Estimated 13+ years.
• IUCN status: Vulnerable (2020). Declining due to nearshore fishing pressure and reef habitat degradation.
• Notable distribution: Reports of blacktips in the eastern Mediterranean — most likely Suez Canal migrants from the Red Sea population.

Grey Reef Shark (Carcharhinus amblyrhynchos)

The grey reef shark is the largest, the most "shark-shaped," and the most likely to leave a strong impression. Where whitetips are slender and blacktips are skittish, grey reefs are confident, well-built, and often investigative. They are also the most threatened of the three — designated Endangered by the IUCN in 2020 after evidence of substantial population declines globally.

Identification

• Size: Maximum 2.55 m, but adults typically 1.5-1.7 m. Largest of the three Red Sea reef sharks.
• Colour: Slate grey to bronze-grey dorsal, white ventral.
• Diagnostic feature: Solid black trailing edge along the entire caudal (tail) fin. No other Red Sea reef shark has this complete black-edged tail. The first dorsal fin is either plain or has a small pale tip.
• Shape: Classic "shark" silhouette — robust body, broadly rounded snout, no interdorsal ridge.

Behaviour

Grey reefs are active during the day, often forming loose schools at favoured sites (reef plateaus with current flow). They face into the current, letting oxygenated water pass over their gills, and use the upstream position to ambush prey carried in the flow. They are the most social of the three Red Sea reef sharks — daytime aggregations of 10-30 individuals at favoured sites are common.

Their behaviour toward divers is normally confident-curious rather than aggressive. However, grey reefs do have a documented threat display — back arched, pectoral fins lowered, exaggerated swimming pattern — that they perform when they feel cornered or threatened. If a grey reef performs this display, back away immediately. It is the only Red Sea shark species that gives a clear pre-attack warning.

Where to see them in the Red Sea

• Brothers Islands (liveaboard) — North and South plateaus of Small Brother offer nearly guaranteed grey reef shark sightings.
• Daedalus Reef (liveaboard) — Grey reef shark schools at the main plateau and along the walls.
• Jackson Reef (Sharm day boat) — South plateau at 25-35 m.
• Ras Mohammed (Sharm day boat) — Shark Observatory specifically.
• Elphinstone Reef (Marsa Alam day boat or liveaboard) — North and south plateaus.

Biology & conservation

• Reproduction: Viviparous (placental, yolk-sac). Litter size 1-6 pups. Biennial reproductive cycle (every 2 years).
• Maturity: 7-7.5 years; females 120-142 cm; males 110-145 cm.
• Lifespan: Up to 25 years.
• IUCN status: Endangered (2020). Population declines of 97% recorded in some studied areas (Great Barrier Reef fishing zones vs no-entry zones — Robbins et al. 2006).
• Threats: Heavy fishing pressure for shark-fin trade, high site fidelity means localised depletion is severe.
• Protection: Marine Protected Areas larger than 20 km of coral reef provide significant protection. The Egyptian offshore marine parks meet this criterion.