[Coral-List] coral reef swimming crabs

[Sarah Frias-Torres]

When monitoring a coral reef nursery, these swimming crabs appeared to be migrating. Any IDs are welcome. Has anyone seen this behavior before? There was some BBC documentary with Attenborough showing one swimming crab with some Japanese music (can't find the clip), but not as many as in here.
http://youtu.be/RiRn1MY4oqM

Sarah Frias-Torres, Ph.D. Coordinator Reef Rescuers ProgramIsland Conservation Centre Nature Seychelles,Amitie, Praslin, Seychelleshttp://www.natureseychelles.org-and-Research CollaboratorSmithsonian-National Museum of Natural Historyat Smithsonian Marine Station, Fort Pierce, FL, USATwitter: @GrouperDocBlog: http://grouperluna.wordpress.comhttp://independent..academia.edu/SarahFriasTorres