Ecology
Giant grenadiers are among the most abundant species from 400–1,000 m in the North Pacific Ocean. Giant grenadiers are apex predators on the upper continental slopes of the northern Pacific. Their main prey are Octopoteuthis deletron squid and Vampyroteuthis infernalis vampire squid.
Description
Giant grenadier can grow to 2.1 m (6 ft 11 in) total length.
Otoliths
Giant grenadier have two otolith shapes that have been observed to date, and there is a third shape that seems to be a mixture of the two distinct shapes.
Fishery
Giant grenadier are of low commercial value but are caught as by-catch. Because of their great abundance, several attempts have been made to develop a fishery for giant grenadier. However, the fish is categorized as "unpalatable" because of its soft texture, high moisture content, and low protein content.
Additional field notes
Giant grenadier change their relationship to the deep seabed as they grow.
Growth, habitat, and food
FishBase describes young fish as spending at least part of their life in the deep water column. At about 50–60 centimetres they become more closely associated with the deep bottom. Larvae are planktonic, so the adult’s bottom-associated life does not describe every stage of development. Reproduction is by eggs.
Adult foods include fish and shrimp as well as cephalopods. The species account also lists comb jellies, echinoderms, worms, crabs, and amphipods. This range of recorded prey complements the importance of particular squid species documented in more focused feeding studies.
Close-up appearance
The low snout projects only slightly beyond the large mouth and lacks a spiny plate at its tip. The head and body are gray-brown, with darker rear edges on the small scales. Fins and the lateral line are darker still; the mouth and gill cavity are black. FishBase describes a small swim bladder. These less obvious characters supplement the very long tapering tail when examining specimens rather than distant underwater images.
Published age records summarized by FishBase extend to 56 years, indicating that this deepwater species can be long-lived.
Article text: Wikipedia contributors, Albatrossia (source revision). Licensed under CC BY-SA 4.0. Retrieved 2026-10-11.