Here the author has furthermore enumerated twenty unrecorded species of fishes with brief descriptions, which are to be newly added into a list of fishes of Niigata Prefecture and its adjacent waters of the Japan Sea side. The author has now checked 501 species of fishes from the waters around Niigata Prefecture.
Among the fishes listed herein, there are one small freshwater fish, Biwia zezera, three youngs of fishes, Zenopsis nebulosa, Chaetodontoplus septentrionalis, and Tetrao don stellatus, which were transported by warm Tsushima Current, and one rare bramid fish, Taractes platycephalus. It is interesting to find distribution of an apodal fish, Muraenichthys gymnotus, in the coast of Sado Island. Thirteen records of col lection of the dealfish, Trachipterus ishikawai, are also given in this paper, which were obtained in the sea surface and coast of Niigata to Yamagata Prefectures during February 1960 to May 1961.