Fish Community Studies

Mitchell Branch was severely impacted prior to fall 1991, and did not have an established fish community (Figure 1).

During the mid-1990s, a gradual recovery was documented, with increases in species and abundance at both sites.  This recovery signaled a significant improvement in water quality.

Following the groundwater isolation construction in 1997-1998, the community in upper Mitchell Branch declined sharply as a result of habitat loss.  This community has just begun the recovery process.

Figure 1. Species richness, biomass, and density for the fish communities at sites in Mitchell Branch (MIK), and in reference streams, Mill Branch (MBK), Scarboro Creek (SCK), and Ish Creek (ISK), 1986 through 2000.

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Last Modified: April 17, 2001