Sloane's viperfish
A deep-sea fish (Chauliodus sloani) known for its long fang-like teeth. The name is usually written in katakana.
The Sloane's viperfish is a deep-sea fish characterized by its large fangs.
Kanji form is rare and mainly found in specialized contexts; the second character 鱛 is not a standard Jōyō kanji.
The name ホウライエソ likely combines 蓬莱 (Hōrai, a mythical mountain paradise) with 鱛 (eso, a type of lizardfish), but the exact derivation is uncertain.