Dugongs are shy, gentle creatures and are usually solitary so finding one on a dive is usually rare but wonderful when it does happen. Dugongs tend to stay in the same area all their life, but even knowing there is one in a bay doesn’t guarantee a sighting.
When you are lucky enough to encounter a dugong remember to respect its space and as with all marine life, look but don’t touch. Most dugongs will tend to ignore divers and continue with their grazing on sea grass so theres no need to chase or harass them. They are mammals so like whales and turtles will have to return to the surface every so often for a breathe so obviously be safe and don’t follow them up and back down as this will increase your chance of Decompression Illness even at the relatively shallow depths of 10m. Just stay still, calm and enjoy the amazing experience.
The dugong is a large marine mammal which together with the manatee are part of the order of Sirenia. The sirenians are actually closer related to elephants than any other sea life. The average size they grow to is around 3metres in length and one this size can be expected to weigh 420kg! They also have a long life scan and can reach 70 years old.
The name dugong originates from “Lady of the Sea” and dugongs are believed to be the inspiration for the mermaids that early sailors spoke of.
They are found in warm coastal waters from the western Pacific Ocean to the Eastern coast of Africa usually in protected shallow bays. The largest population of dugongs is between Shark Bay and Moreton Bay on the east coast of Australia.
The dugong feed mainly on sea grasses, they are heavily dependent on this as a source of food, so only live where sea grass grows. When sea grass is scare they are known to feed on algae and some in Australia even on small invertebrates.
Sadly due to over fishing and destruction of their habitat the number of dugongs has dramatically decreased in recent times and are now extinct in a large number of areas they used to populate such as the Maldives, the Phillippines, Mauritus, Hong Kong, Japan, Cambodia and Taiwan. Dugongs are easy targets for hunters as they are large and slow moving so have been over hunted for their meat, oils, skin and bones.
Other threats have included entanglement in fishing and shark nets, oil spills, being hit and injured by boats or even bad storms and cyclones which can wipe out huge areas of sea grass.
They are now listed as vulnerable and due to their long lives, slow reproduction cycle and limited habitat they are in great danger of becoming extinct.
More detailed information about Dugongs can be found here.
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