電気鰻

電気(でんき) (denki, “electricity”) + 鰻(うなぎ) (unagi, “eel”)

電(でん)気(き)鰻(うなぎ) or 電気鰻(デンキウナギ) • (denkiunagi) 

1. electric eel, Electrophorus electricus

   Synonym: 痺鰻 (shibire-unagi)

As with many terms that name organisms, this term is often spelled in katakana, especially in biological contexts (where katakana is customary).