Hong Kong Underwater Photo Competition Winners 2017 Announced

The Hong Kong Underwater Photo and Video Competition 2017 jointly organised by the Agriculture, Fisheries and Conservation Department (AFCD) and Hong Kong Underwater Association, announced its winning entries.

The Hong Kong Underwater Photo and Video Competition, in its 6th year now, received 436 entries this year, featuring marine ecology, habitats and marine life in Hong Kong waters.

An AFCD spokesman said, “Entries over the years have showcased the beauty of marine life and habitats in Hong Kong waters, and have helped promote the conservation of the marine environment.”

The event comprised a photo competition and a video competition. There were two categories in the photo competition, namely the Macro and Close-up Category and the Standard and Wide Angle Category. In addition to prizes for champions and runners-up in each group, there were Special Prizes for Junior Underwater Photographers presented by the judging panel to encourage less experienced underwater photographers to participate in the competition.

Please click the thumbnail images to enlarge.

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Hong Kong Underwater Photo Competition Winners 2016 Announced

The Hong Kong Underwater Photo and Video Competition 2016, jointly organised by the Agriculture, Fisheries and Conservation Department (AFCD) and Hong Kong Underwater Association, announced its winning entries.

The Hong Kong Underwater Photo and Video Competition, in its 5th year now, received 443 entries this year, featuring marine ecology, habitats and marine life in Hong Kong waters.

An AFCD spokesman said, “Entries over the years have showcased the beauty of marine life and habitats in Hong Kong waters, and have helped promote the conservation of the marine environment.”

The event comprised a photo competition and a video competition. In the photo competition the categories were Macros/Close-ups and Standard/Wide Angle. In addition to prizes for champions and runners-up in each group, there were Special Prizes for Junior Underwater Photographers presented by the judging panel to encourage less experienced underwater photographers to participate in the competition.

Please click the thumbnail images to enlarge.

The winning photos as well as the video entries can also be found on the AFCD Chinese page for the competition and the competitions Facebook page.

The Long-Spined Urchin (Diadema setosum)

When I was a boy snorkelling off beaches one of the sights I best remember and one of the potential hazards was the long-spined sea – Diadema setosum. Its quite a beautiful creature with black or brown-banded spines that are extremely long and narrow. They are also hollow and contain a mild venom which -despite being painful – does not pose a serious threat to humans. And if you have ever stepped on one you’ll know the spines are fairly brittle so getting them out is tricky!

They have a black skeleton shaped like a squashed ball that houses all the organs which is called a ‘test’ and essentially that’s the body of the urchin. Get close enough and you will see a bright, orange ring around the urchin’s “anus” (which is on the top of the urchin as you look at the seabed) and some bluish spots surrounding the orange ring. Similar blue spots are arranged in linear fashion along its test.

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Adult urchins weigh 35 – 80 grams and measure no more than 7 cm in test diameter and around 4 cm in height. But the spines make them look much bigger!

It is commonly found on coral reefs, but also on sand flats and in seagrass beds. Its range stretches throughout the Indo-Pacific from the Red Sea and then eastward to the Australian coast, then as far north as Japan and as far south as the southern tip of the African east coast. Interestingly it has been introduced into other localities not within its natural range. For example in 2006, two living specimens were found in waters off Turkey.
In Hong Kong it’s very common and lives all across the coast of Eastern Hong Kong as well as the southern side of Lamma and probably anywhere where there is coral or rocks with reef-type algae. Check out Hong Kong Reef Check for more info on its distribution in Hong Kong waters.

During the day they hide in a sheltered crevice and at night they leave it to graze on a variety of algal species in an area about 1 m around their crevice. Very hungry individuals may become carnivorous. They can also bite bits of the rocks and corals producing coral sand as debris.

In Hong Kong they probably spawn in summer when the water temperature reaches at least 25 degrees. But other cues, such as a full moon may affect the spawning, too. They need to live in high densities to reproduce because males and females stimulate the opposite sex to spawn by releasing chemicals into the water and that’s only possible when there lots of them in one place. Females release 10-20 million eggs at each spawning, hoping that at least a few of them will get fertilised by the sperm the males release into the water at the same time. The fertilised eggs develop into larvae that will live and drift for 40-50 days as plankton before settling on the seabed. When the larvae finally settle on a naked rock somewhere, they metamorphose – that is transform into real sea urchins. It’s a bit like caterpillars and butterflies or tadpoles and frogs. Incidentally, almost all marine invertebrates go through such a metamorphosis. Frequently they live below another urchins spines to protect themselves from enemies.

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In Hong Kong the long-spines sea urchin has been suspected of causing damage to reefs (along with some other invertebrates), so that the government has at least once undertaken manual removal of these urchins from the Hoi Ha Wan Marine Park. There is ssome research into this topic going on at the Swire Institute of Marine Sciences (HKU).