Fish Community Studies

Fish communities in EFPC are monitored twice annually at six sites within EFPC and at two reference stream sites.  Data are gathered on density, species richness, biomass, and productivity.

During initial sampling in the mid-1980s, the fish communities of EFPC were in poor condition. Species richness was low and there were few individuals. However, as remedial actions were started and completed by the Y-12 Plant, the fish communities began to recover. The species richness increased both at sites immediately below the outfalls (EFK 23.4) as well as sites (EFK 13.8) further downstream (Figure 1).
The recovery extended to the abundance of fish, with densities near the plant soon exceeding levels seen in reference streams.
The recovery of the fish communities is also indicated by the increased occurrence and abundance of more sensitive fish species, such as darters and redhorse, at all sites downstream of the Y-12 Plant (Figure 2).



Figure 1. Trend of species richness in samples of fish community at sites near the Y-12 Plant (EFK 23.4) and further downstream (EFK 13.8), compared to reference stream (BFK 7.6).




Figure 2. Mean number of sensitive species found at fish community sites (EFK) in EFPC and reference streams (BFK and HCK) from 1985 through spring 2000.


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Last Modified: April 17, 2001
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