"Lokacin Kifi" yana nufin lokacin da ake kira Devonian Period, wanda ya kasance daga kimanin shekaru miliyan 419 da suka wuce zuwa shekaru miliyan 359 da suka wuce. A wannan lokacin, an sami rarrabuwar kawuna na nau'in kifin, tare da sabbin nau'ikan kifaye da yawa da suka ɓullo da mallake wurare daban-daban na ruwa. Sunan "Age of Fishes" yana nuna rinjayen kifaye a cikin halittun ruwa na lokacin da kuma muhimmiyar rawar da suka taka wajen tsara yanayin juyin halitta na rayuwar kashin baya.