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17 Apr

WreckSight brings to you unique visualisation of shipwrecks derived from high resolution multibeam sonar data. WreckSight images can be provided as 2D prints or 3D models, viewable on a computer ( PC and Mac) with WreckSight’s own software. You can then virtually explore your chosen wreck on the screen.

WreckSight is a development of ADUS, a company set up jointly by the Universities of St Andrews and Dundee to undertake high definition surveys of wrecks and other man-made structures underwater.

Peacock Worm (Sabella pavonina)

28 Mar

These are facinating to watch. I think it was the first time my dive buddy Kevin had seem them. When i showed them to him he was like a kid having discovered something new for the first time. He kept swimming up to them and touching them just to watch them retract.

For those of you interested heres some information about them. (Sabella), any of a genus of segmented marine worms of the class Polychaeta (phylum Annelida). This type of fanworm (Sabella pavonina) lives in a tube about 30 to 40 centimetres (12 to 16 inches) long that is open at one end and constructed of mud particles cemented together by mucus. All but the top few centimetres of the tube is buried in the substratum. The front end of the worm has a fan of striped feathery tentacles, used for feeding and respiration, that protrudes from the tube into the overlying seawater. Inorganic and organic particles suspended in the water are trapped in mucus secreted by the tentacles. They are then transported down the tentacles by beating cilia and used either for tube building or passed into the mouth as food. Peacock worms rapidly withdraw their tentacles into the safety of the tube when predators approach. These worms are found both in the intertidal zone and in shallow subtidal areas.

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