Found in ancient Chinese as corruption of 鰋 (changing 匽 to 安) and originally meaning a kind of catfish. Later, independently coined in Edo period Japan in word 鮟鱇 (ankō, “monkfish”) from ateji 安康 (ankō) by adding the 魚 (“fish”) radical to each of the ateji characters. As found in Chinese, not considered a Japanese kokuji coinage, though 鱇 is kokuji, as it is not found in Chinese. Subsequently borrowed into Chinese from Japanese, both in compound 鮟鱇 and as isolated 鮟.
Han character 
鮟 (radical 195 魚+6, 17 strokes, cangjie input 弓火十女 (NFJV))
- KangXi: page 1469, character 3
- Dai Kanwa Jiten: character 46108
- Dae Jaweon: page 2001, character 41
- Hanyu Da Zidian: volume 7, page 4689, character 9
- Unihan data for U+9B9F
Usage notes 
Only found in compounds. Not used in isolation.
鮟 (hangeul 안, revised an, McCune-Reischauer an, Yale an)
- 鱇 (안, gang)
- an anglerfish