7144

• UCREFRP Catalog Number: 7144
• Author: Inslee, T. D.
• Title: Spawning and Hatching of the Razorback Sucker
• USFW Year: 1982
• USFW - Doc Type: Western Association of Fish & Game Agencies
• Copyright Material: NO

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the lower station was sampled and May 21 when the upper and middle sta-
tions were sampled. Therefore, the lower station was sampled while
the water was low and the sample was taken in an area that had sup-
ported invertebrates for some time. The habitat sampled at the upper
and middle stations had just recently been inundated, and therefore had
supported invertebrates for only a few days.
The actual numbers of organisms found have little value for deter-
mining the size of invertebrate populations in the study area because
samples were taken in cobble substrate, which represents only about 1%
of the total river bed. Few, if any, organisms are found on the shifting
sand bottom which constitutes most of the river bed (Pearson 1967).
Therefore, our data should be taken as indicative of the invertebrate
community, and its general complexity, which occurs along the shorelines
of the study area.
Taxa collected in 1979 are generally similar to that found by
Holden and Crist (1978). More slow water forms such as Ephoron and
fewer swift water forms such as Simuliidae were collected in our study
as was expected as Holden and Crist (1978) sampled an area with abundant
cobble substrate and swifter flows.

Plankton, Periphyton, and Macrophytes
The trend indicated by the plankton and periphyton data follows
that noted for macroinvertebrates. High water samples are limited to
sampling areas that were essentially dry a short time earlier. This is
actually an equipment problem, but in many ways reflects what is actually

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