Sixteen tropical and two temperate fish species whose distributions are biased to the south of the Japanese Archipelago were collected from the rivers and coastal areas of Sagami Bay and adjacent waters. Oligolepis stomias was newly reported from the Kanto area representing the northernmost record for the species. Eleotris fusca, Ophieleotris sp. 1, Taenioides sp. B, Oxyurichthys lonchotus, Callogobius tanegasimae, Bathygobius hongkongensis, Drombus sp., Favonigobius reichei and Scatophagus argus were recorded for the first time from Chiba Prefecture and these are the easternmost specimen-based records for the species. The occurrence of Plectorhinchus gibbosus in Zushi represents a new specimen-based record from Kanagawa Prefecture. Lutjanus argentimaculatus, Lutjanus rivulatus, Lutjanus fulvus, Kuhlia marginata, Oligolepis acutipennis, Redigobius bikolanus and Bathygobius peterophilus were also noted. These specimens and research of other specimens, pictures and literature surveys show that, in Sagami Bay and adjacent waters, the numbers of stations where each fish species were recorded has increased in recent years. In addition, the total numbers of recorded or settling species are increasing over time in not only the collecting area but also in other areas north of Kyushu along the Kuroshio Current. These results indicate northward range extensions along the Kuroshio Current for these warm water fishes, and can be explained by a rising trend in sea surface temperature caused by global warming.