What is a small silvery fish from northern seas?

There are many small silvery fish from northern seas, so I need more information to give you a specific answer.

Could you tell me:

* What is its approximate size?

* Does it have any distinguishing features? (e.g., shape, fins, spots, stripes)

* What is its typical habitat? (e.g., shallow coastal waters, deeper ocean)

* Is it a popular food fish?

With more details, I can narrow down the possibilities and help you identify the fish.