Pictures
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Surface interval:180 mins
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Temp: Surf 29°C Bottom 24°C
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Dive type : Recreational, Reef, Photo
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Visibility: Excellent
Water: Salt
Recent Divers in Brothers
Dive Profile
- 1. Nitrox 28
- 15L Aluminium
204 → 16 bar
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- Average depth: 14.9m
Data provided by EOL.org
Species Identified
Carcharhinus longimanus (Poey, 1861) (Oceanic white-tip shark)
The diet of the oceanic whitetip shark primarily consists of bony fishes such as tuna and mackerel, but also includes stingrays, sea turtles, sea birds, squid, crustaceans, mammalian carrion , and occasionally even rubbish...
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The diet of the oceanic whitetip shark primarily consists of bony fishes such as tuna and mackerel, but also includes stingrays, sea turtles, sea birds, squid, crustaceans, mammalian carrion , and occasionally even rubbish that is disposed in the sea . The species is usually solitary, but will occasionally congregate in groups during 'feeding frenzies' where food is plentiful , such as around whale carcasses . However, if other shark species are encountered competing for the same food source, the oceanic whitetip shark usually dominates over them, and may become aggressive . This shark is often accompanied by remoras, dolphin fishes and pilot fishes, and reportedly demonstrates an unusual association with the shortfin pilot whale (Globicephala macrorhynchus) in Hawaiian waters . Although the exact reason for this shark swimming along with pods of pilot whales is unknown, it is suspected that oceanic whitetip sharks are following them to sources of squid, which the pilot whales are extremely efficient at locating . This species mates during the early summer in the north-western Atlantic and the south-western Indian Ocean, and females give birth to 1 to 15 live young approximately a year later . Reproduction is viviparous, with live young being born after being nourished by a placental yolk-sac that is attached to the uterine wall by umbilical cords . Sexual maturity is attained at an age of six to seven years for both sexes .
Sphyrna lewini (Griffith and Smith, 1834) (scalloped hammerhead)
Forming impressively large schools, female scalloped hammerheads gather in the Gulf of California during the day, around underwater mountains known as seamounts, where they perform a wide range of poorly-understood behavio...
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Forming impressively large schools, female scalloped hammerheads gather in the Gulf of California during the day, around underwater mountains known as seamounts, where they perform a wide range of poorly-understood behaviours . These aggregations are thought to be a result of many sharks, particularly younger females, seeking refuge in a safe place near a rich food supply, although many alternative theories have been put forward . Young scalloped hammerheads also tend to live in large schools, whereas adults usually occur singly, in pairs, or in small groups . These sharks feed on fish, cephalopods, lobsters, shrimps, crabs, other sharks, and rays. They are thought to be potentially dangerous to humans although few attacks have been recorded . The teeth of the scalloped hammerhead are best suited to seizing prey that can be swallowed whole, rather than ripping into larger prey. The hammer-shaped head is thought to be a mechanism to spread out the ampullae of Lorenzini – sensory organs that detect electric currents, chemicals in the water, and temperature changes . Larger shark species may attack young scalloped hammerheads, but adults have no natural enemies. Adults visit cleaning stations where fish known as cleaner wrasse remove parasites from their skin and mouths . During the 9 to 10 month gestation, the eggs of the scalloped hammerhead hatch inside the body of the female. After hatching, but before birth, they are nourished by a yolk sac placenta. The female moves to shallow waters during the summer where she will give birth to between 15 and 31 live young .
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Eric Cantrel
Egypt
Date: 2018-10-04 - 10:44
Max Depth: 31.1m Duration: 63mins
Dive with Diving Attitude (Plongée France)
Dive buddies:
FB User 10205116339409031
