The drought has reduced the creek flow to a tiny trickle,
but every pool and shallow riffle is full of little fish.
Pools are small and in some areas the riffles have gone
completely dry. At a glance there is no
apparent life in the pools. A closer
examination reveals an abundance of creatures, but all are young and tiny.
The overall color of the fish closely matches that of the
creek bottom. If it weren’t for their
shadows, it would be hard to notice the fish.
Once you begin to follow those shadows, it becomes obvious that the pool
is full of fish.
The fish cruise constantly and investigate the slightest
movement in the water. When the fish
prosper, other organisms suffer. Even
these small fry are effective predators.
No insect larvae can be found anywhere on the creek bottom. Streamside Salamander larvae, which should be
abundant at this time of year, are completely absent. Small fish begin by eating the gills of the
salamander larva and then proceed to pick the body clean.
These fish are too small to identify without actually
collecting a sample. Creek Chubs and
Blacknose Daces are the only species that I’ve found spawning in the creek so
far. They move upstream early in the
spring when the water is high, spawn in
a gravelly location and then move back downstream as the creek flow begins to
subside. From earlier experience, I’m
guessing these to be Blacknose Daces.
Water Strider nymphs compete with the fish for floating food
items. Both are alert for anything that
strikes the surface. The current drought
is causing these pools to shrink in size every day. Unlike many of the other creek dwellers, fish
must have a constant supply of open water.
They don’t have the ability to live beneath a wet rock to await the
return of their pool. If we don’t get
back into a rainy pattern, most of these fish won’t survive.
No comments:
Post a Comment