9361

• UCREFRP Catalog Number: 9361
• Author: Beyers, D. W. and C. Sodergren.
• Title: Assessment and Prediction of Effects fo Selenium Exposure to larval Razorback Sucker.
• USFW Year: 1999.
• USFW - Doc Type: Project 95/CAP-6 SE,
• Copyright Material: NO

exposure to inorganic (dissolved) and organic (dietary) selenium. Effects of exposure were
evaluated by culturing athree-trophic level food chain (algae, rotifer, razorback sucker) and
exposing the fish to gradients of dietary and dissolved selenium. Measurement endpoints
included survival and growth during the exposure period. Data were analyzed using regression
to describe the response of survival and growth as functions of dissolved and dietary selenium
concentrations. The relationships can be used to predict potential effects of selenium
concentrations in razorback sucker nursery habitats.
A separate study was conducted to compare the relative sensitivity of razorback sucker
and fathead minnow to dissolved selenium. Both species were studied simultaneously under
similar exposure conditions using standard 96-hour acute toxicity tests. Consequently, direct
compazison of species sensitivity can be made.
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