The northern limit of the geographic distribution of the Japanese eel Anguilla japonica is Hokkaido, located north of the Tsugaru Strait, in northern Japan. No commercial eel fishing has been conducted in Hokkaido for several decades, and no comprehensive scientific research has been conducted in the region. To investigate the ecological characteristics of this species at the northern limit of its distribution, we collected a...

Euryhaline fishes acclimate to various osmotic environments by changing the direction of water and ion transport between body fluids and environmental waters. Ionocytes in the gills are one of the most important cells for the active ion transport. This study aimed to identify the molecules responsible for apical Cl − transport in rainbow trout ionocytes. Tissue distribution and time-course changes after seawater transfer were...

In teleost fish, branchial ionocytes are important sites for osmoregulation and acid-base regulation by maintaining ionic balance in the body fluid. During the early developmental stages before the formation of the gills, teleost ionocytes are localized in the yolk-sac membrane and body skin. By comparing with teleost fish, much less is known about ionocytes in developing embryos of elasmobranch fish. The present study investi...