[4] A. ferox lives in deep water oceans in the Western and Eastern Pacific, from the Aleutian Islands to Chile; the Western Atlantic, from the Gulf of Maine to the Gulf of Mexico, including the Caribbean Sea; in addition to the Northwest & Eastern Atlantic, Indian Ocean and China Sea.

[7] The known predators for A. ferox include yellowfin tuna, opah, fur seals, Pacific cod, and salmon shark.

[4] In such regions, studies have been conducted to investigate the effects the longnose lancetfish has on the surrounding ecosystems—and whether those impacts are negative or positive for said ecosystems.

[9] When A. ferox was removed from these regions of the Pacific Ocean, there was a negative effect on the ecosystems that showed the importance of this species as both a predatory and prey type.

[9] A study in Suruga Bay, Japan, investigated the stomach contents of various specimens that had washed ashore and found, along with indigestible materials, traces of marine species of the photic and aphotic zones.

[4] As aforementioned, the longnose lancetfish is referred to as the cannibal fish due to its conspecific predation habits.

[9] Size is an influencing factor; small lancetfish will not resort to cannibalism as quickly as larger fish.

[11] Unlike other hermaphroditic fishes, A. ferox has two distinct testicular lobes that are independent from the ovarian region.