New Record of Pseudocycnus appendiculatus Heller, 1868 Parasites of Yellowfin Tuna Thunnus albacares (Bonnaterre, 1788) in the Andaman Sea, Thailand

Four samples of yellowfin tuna, Thunnus albacares (Bonnaterre, 1788), were collected from the Andaman Sea in the Exclusive Economic Zone, Thailand in May 2010. All samples were infested by the parasitic copepod Pseudocycnus appendiculatus at their gill filaments. This report documents a new record of the Andaman Sea, Thailand for P. appendiculatus and also a new host, T. albacares, for this apparent parasite in Thailand is recorded.