The results indicated that the SITE near Saltville serves as a point of delineation in the NFHR for mussel occurrence, abundance, and recruitment.
The paucity of mussel abundance and recruitment for ~35 km (downstream zone Dl) and species richness for ~120 km (zones Dl and D2) downstream of the SITE is biologically significant and emphasizes the impact of historic pollution in the lower NFHR.
2 km reach of the NFHR, beginning just upstream of the brine discharge and including the SITE, as impaired (VADEQ 2006, 2012).
Chloride concentrations measured in water samples from the NFHR beside the SITE boundary varied widely and ranged from ~210 to 26,000 mg/L, whereas CF levels at the brine discharge ranged from ~2,970 to 4,600 mg/L (Echols et al.
2-] can occur in aquatic environments like the NFHR where elevated [Cl.
Pollution in the lower NFHR is likely more complex than just presence of Hg, [Cl.
In 1970, mercury levels in NFHR fish tissue exceeded 0.
Despite these efforts, recent monitoring of mercury levels by various agencies has shown that mercury contamination in NFHR sediments, benthic invertebrates, and fishes remains significantly elevated, particularly near the former plant site and downstream reaches of the NFHR (Trivette, 1998).
The NFHR is an important recreational resource for many individuals, and many anglers acknowledge using fish taken from the NFHR as table fare for themselves and their families.
Study Site--Seventeen sampling stations were established over the entire reach of the NFHR.
Moreover, because only one collecting method was used, Table 3 should not be considered an exhaustive list of all NFHR fish species.
When fishes were classified by feeding type, insectivores had a significantly higher median tissue mercury level than herbivores for the NFHR overall (Fig.