Notes on Fourteen Aquatic Animals Collected from the Rivers around the Atsumi Peninsula, Japan.

Abstract

We conducted field surveys of aquatic animals in seven rivers on the Pacific coast of Atsumi Peninsula, Aichi Prefecture, Japan and collected 30 species of fish, 21 species of decapod crustaceans, and 5 species of gastropods. Fourteen species of them were described in detail based on the specimens, of which two fishes (Kuhlia marginata and Eleotris melanosoma), five freshwater caridean shrimps (Macrobrachium formosense, M. lar, M. latimanus, Caridina typus and C. multidentata), a brackish-water crab (Ptychognathus ishii) and a freshwater snail (Septaria porcellana) represented the first records from Aichi Prefecture. Since all of these species had already been recorded from adjacent areas, lack of surveys and/or reports from small streams in the prefecture may explain why there were so many first-time records. On the other hand, some of them were diadromous species which mainly inhabit more southerly areas, and therefore these species might have come to appear in Aichi Prefecture in recent years due to the effects of global warming.