鲭

Left 鱼 is the fish radical, simplified from 魚 - head on top, body in the middle, tail-fin at the bottom (the four dots in the traditional form, flattened to a single horizontal in simplified). Indexing radical, anchoring 鲭 in the fish family alongside 鲤 carp, 鲑 salmon, 鲨 shark, 鳕 cod.

Right 青 supplies the sound - qīng straight through - and a real semantic flavour: mackerel and saury have shimmering blue-green backs, exactly the colour 青 names. So the phonetic doubles as a true descriptor: 鲭 is the 'blue-green fish.' Same phonetic family: 清 clear, 情 feeling, 请 please, 晴 sunny - all carrying qīng or related readings.