Carcinoscorpius rotundicauda. Tung Chung, Hong Kong on 3 July 2012.

The following photographs are of one foraging juvenile and two mating pairs of  Carcinoscorpius rotundicauda (Mangrove horseshoe crab) photographed in a stream at Tung Chung, Lantau, Hong Kong on 3 July 2012:

Tachypleus tridentatus. Tung Chung, Hong Kong on 23 September 2010.

The following photographs are of juvenile Tachypleus tridentatus and their foraging trails at the intertidal mudflat at Tung Chung, Lantau, Hong Kong on 23 September 2010:

Juvenile T. tridentatus.

Foraging trails of juvenile T. tridentatus.

Carcinoscorpius rotundicauda. Tung Chung, Hong Kong on 23 September 2010.

The following photographs are of dead Carcinoscorpius rotundicauda (Mangrove horseshoe crab) found alongside a stream which runs across the mudflat at Tung Chung, Lantau, Hong Kong on 23 September 2010.

The horseshoe crabs hanging in the mangrove bush are a male and female, possibly a mating pair which were swimming up the stream to spawn in the mangroves that line the stream. The animal lying on its back is a dead female C.  rotundicauda.

Streams are critical to the ecology of C. rotundicauda, because they use stream courses to navigate across beaches to reach the mangrove stands where they spawn. C. rotundicauda has also been observed to spawn in the lower reaches of streams in Hong Kong.

Carcinoscorpius rotundicauda. Tung Chung, Hong Kong on 6 May 2011.

The following photographs are of a male Carcinoscorpius rotundicauda (Mangrove horseshoe crab) which was caught by a fisherman in the Tung Chung stream, Lantau, Hong Kong on 6 May 2011.

A monofilament fishing net, which is similar to the one that was used to catch this horseshoe crab can be seen stretched across the stream in the first photograph.