Summary[edit] Description: English: Sperm release by the sea cucumber Pearsonothuria graeffei during a mass spawning event on the island of Koh Tao, Thailand. Date: 12 September 2014, 03:55:16. Source: Own work. Author: ConserveMarine. Camera location10° 07′ 32.46″ N, 99° 48′ 37.08″ EView all coordinates using: OpenStreetMap 10.125683; 99.810300.