A potamodromous fish, like an anadromous or catadromous fish, is a migratory fish. Unlike anadromous or catadromous fish, a potamodromous fish spends its whole life in fresh water. Generally, these migrations are for spawning purposes and cover short distances: from an upstream tributary to a mainsteam river or between connected lake and river systems. Some species, for example the endangered Colorado Pikeminnow (Ptychocheilus lucius) have very extensive fresh water migration routes – reportedly up to 300km. Like salmon, the pikeminnow uses homing to reach very specific spawning locations with a high degree of fidelity.
For more information, check out the “CAN YOU SAY ANADROMOUS, CATADROMOUS, AMPHIDROMOUS, OCEANODROMOUS, OR POTAMODROMOUS?” post on The Fisheries Blog!