Further record of Ceratothoa carinata (Isopoda: Cymothoidae) parasitic on Decapterus maruadsi in Japanese waters

The cymothoid isopod Ceratothoa carinata (Bianconi, 1869) was found in the buccal cavity of the Japanese scad Decapterus maruadsi (Temminck & Schlegel, 1843) from the western Seto Inland Sea. This parasite is likely to be common in some local populations of D. maruadsi in Japanese waters.