crestfish; unicornfish
Refers specifically to Lophotus capellei, a deep-sea fish. The name 'unicornfish' is sometimes used but may cause confusion with the unrelated tropical surgeonfish also called unicornfish.
The crestfish is a deep-sea fish and is rarely caught.
I saw a specimen of a crestfish at the aquarium.
Katakana spelling is standard for this fish name; usually written in kana.
Ateji kanji spelling; rarely used and mainly encountered in older or specialized texts.
The name likely derives from 赤 (aka, 'red') and ナマダ (namada), possibly related to ナマズ (namazu, 'catfish') or a dialectal term, but the exact origin is uncertain.