DIADROMOUS
diadromous: translation
those fishes which regularly migrate between fresh and salt water during a definite period of the life-cycle. Includes anadromous and catadromous fishes, e.g. Petromyzon, Alosa, Oncorhynchus, some Galaxias, Anguilla, Sicydium (Myers, 1949; McDowall, 1968)