noun
Wels catfish
A large freshwater fish native to Europe; scientific name Silurus glanis.
ヨーロッパオオナマズは最大で3メートルを超えることもある。
The Wels catfish can sometimes exceed 3 meters in length.
From ヨーロッパ (Europe) + 大 (large) + 鯰 (catfish), literally 'European giant catfish'. The katakana spelling is standard for this loanword-based compound.