More and more divers have reported stinging injuries as a result of grasping mooring lines with ungloved hands. Rope fibers themselves can cause injury as well. From the reports DAN receives, however, most mooring line injuries appear consistent with a marine life envenomation.
Colonies of organisms eventually inhabit all man-made objects in the ocean, including mooring lines. It is not known with certainty exactly what organism inhabits the lines. Many authorities maintain that the most likely suspect is a member of the hydroid family, a class of coelenterates that also includes jellyfish. Divers should treat these injuries the same way jellyfish/fire coral injuries would be treated.