sea chub; Ditrema temminckii temminckii
A marine fish found in coastal waters of Japan and East Asia; the name refers specifically to the species Ditrema temminckii temminckii.
The sea chub is a fish often seen in shore fishing.
Kanji spelling is seldom used; learners will almost always encounter the katakana form.
The name ウミタナゴ (sea + タナゴ, a type of bitterling) likely refers to its resemblance to freshwater bitterlings (タナゴ) in shape, though the exact derivation is uncertain.