Terms for subject Ichthyology containing In a

English	Russian
in a belly-up position	вверх брюхом (о рыбах и рептилиях: While they are in a belly-up position, the strong righting reflex will induce them to strain and struggle. Гевар)
in a regular fashion	в обычной манере (Malysheva)
place in a river where cartilaginous fish hibernate	ятовье (= ятовь)
place in a river where cartilaginous fish hibernate	ятовь