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Temp: Surf 27°C
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Dive type : Recreational
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Visibility: Excellent
Recent Divers in Gili Islands
Recent Pictures in Gili Islands
Data provided by EOL.org
Species Identified
Hippocampus kuda Bleeker, 1852 (Sea horse)
Perhaps the most unique and unusual feature of seahorse biology is the fact that it is the male and not the female who becomes pregnant. When mature, males develop a pouch on the belly, known as the brood pouch. Breeding t...
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Perhaps the most unique and unusual feature of seahorse biology is the fact that it is the male and not the female who becomes pregnant. When mature, males develop a pouch on the belly, known as the brood pouch. Breeding takes place in spring and summer; the female inserts her ovipositor into the male's pouch and lays her eggs. The male then fertilises them and they become embedded into the wall of the pouch. The pouch is very similar to the womb found in female mammals; a placental fluid removes waste products and supplies the eggs with oxygen and nutrients. As pregnancy progresses, this fluid gradually becomes similar to the surrounding seawater, so that when the young seahorses are 'born' the change in salinity is not too great a shock . After 20 to 28 days of pregnancy the male goes into labour, typically at night when there is a full moon . After hours of thrusting, the miniature seahorses, which look exactly like the adults, are released from the pouch. . The offspring are fully independent after birth and must fend for themselves . They are pelagic in the first stage of life, or hold onto floating debris at the surface with their tail . Seahorses are ambush predators, and lie in wait for small crustaceans to swim by; they then suck the prey into the tube-like mouth and swallow it whole, as they do not have any teeth . They do not have many natural predators, as they rely on their excellent camouflage for protection, and they are unpalatable due to their bony-plated bodies .
Amphiprion ocellaris Cuvier, 1830 (false clown anemonefish)
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
Mobula mobular (Bonnaterre, 1788) (Giant devil ray)
The gregarious giant devilray tends to move around in groups, swimming close to the surface . They apparently make long migrations , and show a preference for stretches of ocean traversed by strong currents . The giant ...
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The gregarious giant devilray tends to move around in groups, swimming close to the surface . They apparently make long migrations , and show a preference for stretches of ocean traversed by strong currents . The giant devilray feeds on plankton and small pelagic fishes , which are strained out of the water . Their horn-like cephalic fins assist in feeding . Giant devilrays are ovoviviparous , a method of reproduction in which embryos develop within eggs that remain inside the mother's body until they hatch. The gestation period is long, lasting about 25 months, and results in only one, or rarely two, pups born in summer . These newborn devilrays can measure up to an astonishing 180 centimetres in width .
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Indonesia
Date: 2015-09-16 - 11:00
Max Depth: 8m Duration: 40mins
Dive with Robin from Diversia Diving
Depart bateau de Gili Travagan
Tortues
Hipocampe