Experts have helped me identify some of them as Red-bellied Dace that swarm in riffles and pools.
These tiny fish jump into the air, leaving circular wakes when they land back in the water. At first I thought they were feeding on the insects swarming overhead or swooping low to lay their eggs in the water.
But on closer inspection, I saw that's not what they're doing. These fish feed by nosing around underwater stones and gulping the algae that covers immersed objects.
So what is the jumping all about?
I found one tiny fish floating dead in a pool. Finally I had a photographic subject who stayed still! Here are some of his pictures:
Is this a Red-bellied Dace? Or is it a different species altogether?
I am hoping people who know fish will share their knowledge with me!