noun
upside-down catfish
Refers to the species Synodontis nigriventris, a small African catfish known for swimming upside down. The Japanese name literally means 'upside-down catfish'.
サカサナマズは、普段は逆さまになって泳いでいる。
The upside-down catfish usually swims upside down.
水族館でサカサナマズを見たことがありますか。
Have you ever seen an upside-down catfish at an aquarium?
Compound of 逆さ (sakasa, 'upside-down') and 鯰 (namazu, 'catfish'), describing the fish's characteristic swimming posture.