Discrimination of amphidromous and landlocked ayu, Plecoglossus altivelis altivelis (Teleostei: Plecoglossidae) in the Nuta River, Hiroshima prefecture [Japan], using the otolith Sr/Ca ratio

calcio calcium ciclo vital cours d'eau cursos de agua diadromous fishes estatolitos estroncio freshwater fishes identification japan japon life cycle peces de agua dulce peces diadromos plecoglossus altivelis poisson d'eau douce poisson diadrome rivers statolithe statoliths strontium