do all rivers have fish??im curoious there's a stream at the bottom of my field that in some parts is about 2-3 meters wide and at the bottom of...

No, all rivers do not have fish.  Like any animal, fish
have certain requirements for their habitats.  There are many different types of fish
and each type has it's own needs.  My guess would be that there aren't any large fish in
your stream.  I doubt a small stream could have enough space to meet the habitat
requirements of most river fish.  However, there could certainly be minnows.  These fish
are very tiny, but they make great bait for catching larger fish.  There are certainly
other types of animals in your stream as well.  Depending on where you live, there might
be small crayfish or sculpins.  The mbgnet link below has lots of great information on
animals found in rivers and streams.