Adults occur near bottom . Young to 7.2 cm are pelagic or bathypelagic, usually associated with jellyfish . Juveniles take shelter under the medusae and are often mistaken for medusafish Icichthys lockingtoni .
Dorsal spines (total): 54 - 57; Dorsal soft rays (total): 0; Anal spines: 0; Anal soft rays: 29 - 30. Caudal rounded.: short and / or deep; Cross section: compressed.
Behavioural data for Prowfish is currently being reviewed.
Marine; demersal; depth range 0 - 675 m , usually 0 - 500 m . Boreal; 0°C - 4°C ; 66°N - 34°N North Pacific: Hokkaido, Japan and western Kamchatka, Russia to Navarin Canyon in the Bering Sea, Attu Island in the Aleutian chain and San Miguel Island, California, USA.
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