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Dive type : Recreational
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Water: Salt
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Data provided by EOL.org
Species Identified
Rhincodon typus Smith, 1828 (Whale shark)
These sharks are usually solitary, but loose groups of up to 100 individuals have been sighted, often when they are feeding . Whale sharks appear to be highly migratory , and have been tracked for thousands of kilometres ....
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These sharks are usually solitary, but loose groups of up to 100 individuals have been sighted, often when they are feeding . Whale sharks appear to be highly migratory , and have been tracked for thousands of kilometres . Individuals who regularly visit the Ningaloo Reef in Australia, between March and May every year, appear to be mainly immature males . It is not clear whether movements across deep ocean basins follow prey routes or are undertaken for other reasons. Very little is known about the reproduction of the world's largest fish, but in 1995, one pregnant female was captured who contained nearly 300 foetuses . The species is ovoviviparous; the young hatch from eggs retained within the mother so that she then gives birth to live young. Whale sharks are fairly docile creatures and feed on planktonic organisms and small fish by suction filter-feeding . This species is thought to be a more dynamic filter-feeder than, for example, the basking shark, actively sucking food in through their vast mouths and passing the water over the gill arches, where prey are retained and then swallowed . They have also been observed actively swimming through shoals of fish with their mouth agape or hanging vertically in the water and drawing food into their mouths .
Lepidochelys olivacea Eschscholtz 1829 (Olive Ridley Turtle)
Although they do also nest alone, olive ridleys are known for their remarkable mass nestings, when many thousands of females congregate on the same beach; the event is known as an 'arribada', which is Spanish for 'mass arr...
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Although they do also nest alone, olive ridleys are known for their remarkable mass nestings, when many thousands of females congregate on the same beach; the event is known as an 'arribada', which is Spanish for 'mass arrival' . Males and females migrate from the feeding grounds and mating occurs just offshore of the beach . Usually at night, and coinciding their nesting with the high tide, females haul out on their natal beach and lay clutches that typically contain around 110 to 120 eggs . These astonishing mass nestings can involve up to 150,000 females and there may be more than one arribada on a single beach; this overcrowding means that turtles are often crawling over each other to move up the beach and may even unearth other nests whilst digging their own . During one season a female may lay two to three clutches of eggs, returning to breed every few years . After around 50 to 60 days, the hatchlings emerge and make their chaotic dash to the sea . Predators such as jackals and crabs will feed on turtle eggs, whilst birds attack hatchlings on the beach and fish wait in the shallows . These arribadas probably function to increase hatchling survival by overwhelming predators with sheer numbers . Adult olive ridleys are carnivorous and feed on a wide variety of organisms including fish and molluscs ; sometimes diving up to 150 metres in search of prey . Very little is known about the first years of life but juveniles probably spend a number of years floating on the ocean currents and feeding on planktonic organisms .
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Raynita
Maldives
Date: 2013-09-26 - 15:16
Max Depth: 18m Duration: 60mins
4 Whale Sharks & Turtle!