The team, led by Antonella Pedergnana of the Römisch-Germanisches Zentralmuseum Archaeological research institute in Germany, studied 19 bone fish hooks and six grooved stones. These were found in the Jordan River Dureijay (JRD) in the Hula Valley, northern Israel. Researchers believe that the grooved stones were used as weights for the rods. The groundbreaking research study was explored in BBC Science Focus magazine.