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You are here: Home » News » Industry Encyclopedia » Stony corals and soft corals

Stony corals and soft corals

Views:105     Author:Site Editor     Publish Time: 2019-08-19      Origin:Site

Do you know which of the top ten diving spots in the world? 

Perhaps you will say that, Seychelles which has the world's second largest coral atoll, crystal clear Saipan , Great Barrier Reef which has the world's widest coral reef, and the most mysterious and magical ocean, Belize big blue hole. Surely, these are. And for the beautiful ocean, diving is definitely the best way to get to know them.


However, for diving enthusiasts, it is important to pay attention to how to avoid being injured by corals during diving. In order to expore the deep blue mysterious under water, several tools are necessarily need for divers, such like diving knives, diving packbags and diving buoy.


Everyone knows diving knives and diving packbags, but what is the function of the diving buoy? When we are ready to go out at the end of the dive, we are worried that there will be a high-speed boat passing by on the water or on the waterway. So we could inflat the diving buoy wehn we under the water, the diving buoy will floated on the water. It is a striking marker which can be seen on the surface of the water and could help to avoid being hit by a boat.


If you have the diving equipment, you may want to learn how to distinguish stony corals and soft corals. There are some differences are listed at following.

Ecologically, (1) One type of stony corals is distributed in tropical shallow sea area. They are group-based symbiotic with the single-celled dinoflagellates, and  known as reef-building corals. The other type of stony coral is distributed in deep-sea cold water, mainly is monomer, not reef,  which called non-reef coral. The optimal water temperature for the growth of stony corals is 25 to 29 ° C,  and it will die below 13 ° C.  Suitable salinity is 27-40. And it requires clean sea water, hard foundation. (2) Soft corals are mainly live in tropical and subtropical shallow sea area, meanwhile with a few species distributed in temperate zone, cold zone and deeper seas.


In appearance, as the name implies, there is the biggest difference is that, stony coral’s polyps form harder, calcium carbonat skeletons. Thus, some stony coral is called "grape stone" which like a grape. And some seems like cauliflower which we call it "stone flower". As for Soft corals , they are named for their soft body. It has a beautiful shape, various vivid colors and a beautiful appearance. The population is diverse in shape, with block shape, mushroom shape, and branching plant shape. The base of the group is called the handle;


In structure, hard coral polyps are built on a six-fold symmetry, while soft coral polyps are built on an eight-fold symmetry. Next time when you diving, you could take a closer look at soft-coral polyps, and you will find it has eight tentacles, whereas hard-coral polyps will form in multiples of six.

So, let’s begin a sea adventure.



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