Fotos
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Tipo de buceo: Recreo, Aquarium
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Visibilidad: Excelente
Equipo específico utilizado
Buceadores recientes en Melbourne
Fotos recientes en Melbourne
Datos proporcionados por EOL.org
Especies identificadas
Carcharias taurus Rafinesque, 1810 (sand tiger shark)
The sand tiger shark is one of the best-studied of the shark species. They are the only sharks known to gulp air at the surface and store it in their stomach to provide buoyancy . These sharks generally mate between October...
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The sand tiger shark is one of the best-studied of the shark species. They are the only sharks known to gulp air at the surface and store it in their stomach to provide buoyancy . These sharks generally mate between October and November and courtship can take a long time, with the male aggressively nipping his potential mate . Females are ovoviviparous, giving birth to two large pups every two years. Pups hatch out of their eggs within the oviduct of the mother's reproductive system, one in each oviduct, and then feed on eggs that the female continues to produce . Over nine months to a year, the pups grow within their mother feeding on hundreds to thousands of eggs and, by the time they are born, measure up to a metre long . During the day they are found near caves and ledges , hovering just above the surface either singly or in small groups . These fairly docile sharks are sluggish and, despite a ferocious reputation, feed mainly on fish .
Triakis semifasciata Girard, 1855 (Leopard shark)
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 astonishi...
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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
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Kallun
Australia
Fecha: 2011-12-28 - 17:00
Profundidad máxima: 7m Duración: 30mins
