red-fleshed fish
Refers to fish with dark red flesh, such as tuna, bonito, mackerel, and sardines. Often contrasted with 白身魚 (white-fleshed fish).
Red-fleshed fish are rich in iron.
Tuna and bonito are typical red-fleshed fish.
Compound of 赤身 (red flesh) + 魚 (fish). The term is straightforward and modern.