noun
brown sole
A species of righteye flounder found in the northwestern Pacific. Scientific name: Pleuronectes herzensteini.
真鰈は日本海でよく獲れる。
Brown sole are often caught in the Sea of Japan.
市場で新鮮なマガレイを買った。
I bought fresh brown sole at the market.
鰈 (かれい) is the general term for righteye flounders, while 真鰈 (まがれい) refers specifically to the brown sole species.
The kanji 真 (ま) means 'true' or 'genuine', and 鰈 (かれい) means 'righteye flounder'. The name likely distinguishes this species as a typical or genuine flounder.