Abstract / Introduction / Summary:
Ceratothoa oxyrrhynchaena Koelbel, 1878 is a buccal cavity parasite of marine fishes. An ovigerous female and an adult male of the species were collected from a frozen-thawed yellowback sea-bream, Dentex hypselosomus Bleeker, 1854, purchased in the fresh fish section of a local supermarket in Asahikawa, Hokkaido, northern Japan. The female and the male are briefly described. The infected yellowback seabream was commercially caught off Yamaguchi Prefecture, western Japan, and then transported frozen to Asahikawa. The present collection of C. oxyrrhynchaena represents its first record from fishes sold in Japanese local supermarkets.