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Temp: Surf 32°C Bottom 26°C
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Visibility: Excellent
Water: Salt
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Dive Profile
- 1. Air
- 12L Steel
230 → 50 bar
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- Average depth: 21.5m
Data provided by EOL.org
Species Identified
Chelonia mydas Linnaeus 1758 (Green Turtle)
Green turtles are long-lived and may take up to 59 years to reach sexual maturity Undertaking tremendous feats of navigation, adults return to the same beach to breed each season, part of the population in Brazil astonish...
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Green turtles are long-lived and may take up to 59 years to reach sexual maturity Undertaking tremendous feats of navigation, adults return to the same beach to breed each season, part of the population in Brazil astonishingly migrates around 2,250 kilometres across the open ocean to breed on the Ascension Islands . Mating tends to occur just offshore of the nesting beaches; using a curved claw on each front flipper and a flat nail at the end of the tail, males are able to grip their mates . Females haul out onto the beach at night and dig large nests with their back flippers beyond the high tide mark, they typically lay between 100 and 150 eggs in one nest and then proceed to cover the eggs with sand; the whole process takes around two hours . A single female returns to breed only once every two to five years but will lay up to nine nests in that one season . Incubation takes between 45 and 70 days, and temperature has been shown to determine of the sex of hatchlings; with females being produced at warmer temperatures . Breaking open their eggs with a special hooked 'egg tooth' that will subsequently be lost; hatchlings use their powerful front flippers to reach the surface, and then proceed to the sea . The soft-bodied juveniles are particularly vulnerable at this time from a variety of predators, such as ghost crabs and gulls on the beach to sharks and dolphins in the water . Unlike other marine turtles, adult green turtles are almost exclusively herbivorous, grazing on seagrasses and algae ; it is assumed that juveniles are more omnivorous although the exact composition of their diet is unknown
Epinephelus tukula Morgans, 1959 (potato cod)
Mainly found in deep reef channels and seamounts, in current prone areas . Juveniles may be found in tide pools . Feeds on reef fishes, skates, crabs, and spiny lobsters . Considered to be exceedingly territorial and ve...
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Mainly found in deep reef channels and seamounts, in current prone areas . Juveniles may be found in tide pools . Feeds on reef fishes, skates, crabs, and spiny lobsters . Considered to be exceedingly territorial and very aggressive towards intruders. Vulnerable to spear fishers . Hand fed by divers in certain areas, but potentially dangerous to the inexperienced. In the Hong Kong live fish markets .
Triaenodon obesus (Rüppell, 1837) (Whitetip reef shark)
Despite its docile nature during the day this nocturnal shark can become aggressive when hunting at night, thrashing through coral reefs looking for potential prey. The whitetip reef shark usually hunts alone, but is non-t...
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Despite its docile nature during the day this nocturnal shark can become aggressive when hunting at night, thrashing through coral reefs looking for potential prey. The whitetip reef shark usually hunts alone, but is non-territorial and will occasionally work in cooperation with others in the pursuit of prey . Feeding primarily on bottom-dwelling octopus, lobsters, crabs and bony fish, it often chases its prey into a crevice before jamming its body in after it, sealing the exit . The extremely posterior location of the first dorsal fin compared to those of other sharks is an adaptation to this feeding habit, which allows them to get their heads and mouths much further into the gaps and holes in the coral . The whitetip reef shark's mating season varies with location . Reproduction is viviparous and after a gestation period of around a year the female will give birth to one to five live pups, which are completely independent at birth . Both sexes reach sexual maturity at approximately 5 years old, and it is estimated that this species can live to an age of 25 years .
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 .
Carcharhinus tilstoni (Whitley, 1950) (Australian blacktip shark)
Found on the continental shelf from close inshore to about 150 m depth . Found throughout the water column but usually near the sea bed during the day and near the surface at night . Prefers teleost fishes but also feeds...
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Found on the continental shelf from close inshore to about 150 m depth . Found throughout the water column but usually near the sea bed during the day and near the surface at night . Prefers teleost fishes but also feeds on cephalopods to a lesser degree. Viviparous . Forms large aggregations . Utilized for its meat and fins . The flesh has a relatively high mercury content .
Somniosus microcephalus (Bloch and Schneider, 1801) (gray shark)
Found on continental and insular shelves and upper slopes down to at least 1,200 m and to as deep as 2,200 m . Epibenthic-pelagic . In the Arctic and boreal Atlantic, it occurs inshore in the intertidal and at the surfa...
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Found on continental and insular shelves and upper slopes down to at least 1,200 m and to as deep as 2,200 m . Epibenthic-pelagic . In the Arctic and boreal Atlantic, it occurs inshore in the intertidal and at the surface in shallow bays and river mouths during colder months, retreating to depths of 180-550 m when the temperature rises . Feeds on pelagic and bottom fishes (herring, Atlantic salmon, Arctic char, capelin, redfish, sculpins, lumpfish, cod, haddock, Atlantic halibut, Greenland halibut and skates ), sharks and skates , seals and small cetaceans, sea birds, squids, crabs, amphipods, marine snails, brittle stars, sea urchins, and jellyfish . Petromyzon marinus was reported to have been attached to S. microcephalus . Ovoviviparous . Also utilized fresh and dried for human and sled-dog food ; eskimos also used the skin to make boots, and the sharp lower dental bands as knives for cutting hair . A very sluggish shark .
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Gerard
Australia
Date: 2008-03-16 - 10:41
Max Depth: 32.2m Duration: 52mins
Dive with Taka Dive
Shark feed