Marine organisms called blue buttons, which can cause skin irritation among humans, have been sighted along the Goa coast, a lifeguard agency deployed at the state's beaches said on Sunday.
Blue button, also called porpita porpita, consists of a colony of hydroids found in tropical and sub-tropical waters of the Pacific, Atlantic and Indian oceans.
In a statement, Drishti Marine Service said, "Our lifeguards spotted blue buttons washed ashore at beaches in north and south Goa. Its sting is not powerful but touching it can cause skin irritation."