Oceanographers invent device that tracks even the tiniest jellyfish
 

With barely two percent of the seafloor explored, we know a whole lot less than we'd like to about the Earth's oceans and its myriad of residents. Among the more numerous but less studied oceanic animals are soft-bodied like squid, octopi and jelly...

http://www.engadget.com/2015/09/30/d...est-jellyfish/