Valley - Free stock photo

It is a photograph in which it took a picture of the river that flows in the valley in the mountain. Very beautiful water flows, and the word clear stream is a fit image. Rain that falls in the mountain gathers little by little, it becomes such a flow, such a flow gathers gradually, it becomes a big river, it flows in a long distance, and it pours into the sea.
Is it small and does the living thing live in the shallow stream about this level?There seem to seem too to be not food, either the flow of water be fast, and live only by the tiny insect. It is a splish-splash and when it swims, a big fish is a surprise as for such a place. Is there a small river fish?