blue-backed fish
Refers to fish with a bluish back, such as sardines, mackerel, and saury. Often used in culinary and nutritional contexts.
Blue-backed fish are rich in DHA and EPA.
Let's grill some blue-backed fish for dinner tonight.
Compound of 青 (あお, 'blue') and 魚 (さかな, 'fish'). The reading あおざかな is a straightforward combination, with rendaku voicing of さかな to ざかな.