Venomous jellyfish sightings quintuple off Korean coast

Sightings of giant Nomura’s jellyfish in Korean waters have increased fivefold from a year earlier and spread across a wider area, the National Institute of Fisheries Science said Thursday. The institute said it has not yet determined the exact cause of the surge. Nomura’s jellyfish can grow up to 2 meters in diameter and deliver painful stings that may cause swelling, fever and numbness, or even shock in severe cases. The species typically drifts into Korean waters from the East China Sea durin