Abstract / Introduction / Summary:
In total, 78 specimens of Argulus japonicus Thiele, 1900 were collected fishes reared in Shiga Prefecture, central Japan, and have been deposited at the Lake Biwa Museum (LBM) in Kusatsu of the same prefecture. Sixty-three specimens were taken from four species of fishes, including silver crucian carp Carassius sp., unidentified crucian carp Carassius sp., bighead carp Hypophthalmichthys nobilis (Richardson, 1845), and most probably common carp Cyprinus carpio Linnaeus, 1758, at the LBM; one specimen from an unidentified fish at Monobe Elementary School in Moriyama; and 14 specimens from common carp at a carp hobbyist’s house in Nagahama. The collections of A. japonicus from the first three fish species at the LBM represent the first specimen-based records of this parasite from those fish species reared in Japan.
