Species whose adults migrate to the sea begin preying on other fish soon after metamorphosis, even as they begin swimming downstream.

My brother dragged me to the river and we swam downstream.

At the end of the music video the young man attempts to swim across the Hvítá river downstream from the Gulfoss.

Slipping silently into the water off the far side of the rock, she swam downstream a ways, then waded toward the shallows.

Do you feel as if you're swimming downstream with the current of a mighty river?

They would survive, but they would not know how to swim downstream, to the vaster world of the ocean.

It leapt forward into the river, and immediately began swimming downstream.

They swam downstream, making good time.

He swam downstream, missiles still pattering like heavy hail upon the water's surface round him.

You could become a big fish in a small pond and soon be invited to swim downstream.