Adult females of the lernaeopodid copepod Salmin- cola edwardsii (Olsson, 1869) were found infecting southern Asian Dolly Varden, Salvelinus malma kra- scheninnikova Taranetz, 1933 (Salmoniformes: Sal- monidae), from the Rausu River, Hokkaido Island, Ja- pan. The bullas of copepods were embedded by the distal ends of shortened gill filaments, which formed bulbous swellings. The gill filaments adjacent to cope – pods were club-shaped and adhered at their distal por- tions, and often abbreviated in length. However, no such serious injury was found at attachment sites in the branchial chamber. Thus, the copepods infecting the gills are considered to have stronger negative im- pacts on the host fish than those parasitizing the bran – chial chamber.

オショロコマナガクビムシの寄生によるオショコロコマの鰓の病変(長澤和也)