Organochlorine compounds in bed sediment and fish tissue in the South Platte River Basin, USA, 1992–1993

Organochlorine Chemical Residues in Fish from the Mississippi River Basin, 1995

“…In the MRB, this pattern persisted into 1995; dieldrin residues were present in 42% of the samples from 57% of the stations, at concentrations ranging from barely detectable (about 0.01 g/g) to 0.25 g/g (Figure 4, Table 2 Table 2). Concentrations at most sites in the central MRB compare favorably to 1992-93 values reported for the South Platte River system by Tate and Heiny (1996) and confirm the presence of relatively high values in fish from agricultural and urban watersheds in Iowa (Roberts 1997); however, the 1995 MRB maxima were at least twice those reported by either of the latter studies. No dieldrin residues were detected in samples from the reference site (Figure 4).…”

“…All of the greatest concentrations of total DDT (i.e., . These concentrations were about 10-fold greater than those reported by Tate and Heiny (1996) in fish from the South Platte River basin. Total DDT concentrations in fish from Station 400 were 0.3-0.4 g/g (mostly as p,pЈ-DDE) in carp and Ͻ 0.1 g/g in largemouth bass ( Figure 2).…”

“…Two NCBP sites in the upper Platte River system were not sampled because organochlorine chemicals had been extensively investigated there in 1992-93 (Tate and Heiny 1996). At the NCBP stations, which represent key points (i.e., confluences of major tributaries, impoundments) on some of the largest U.S. rivers, concentrations of accumulative contaminants in fish were monitored from 1967 through 1986 (Johnson et al 1967;Schmitt and Bunck 1995;Schmitt et al 1999c).…”

“…Al- though banned for most uses in 1984, it was used sporadically in the northern Great Plains through the 1980s, and Tate and Heiny (1996) detected 0.1-0.2 g/g of endrin in fish collected from the Platte River system in 1992-93. In 1995, endrin was present in only four samples (Table 2), all from NCBP Station 76 (Mississippi R. at Memphis).…”

Aldrin and Dieldrin: A Review of Research on Their Production, Environmental Deposition and Fate, Bioaccumulation, Toxicology, and Epidemiology in the United States

“…Dieldrin was found in similar concentrations in the muscle of the lake trout gravid fish and in its eggs (135). Studies of maternal transfer of lipophilic organochlorines in salmonines and winter flounder to their eggs show a significant correlation of organochlorines in mother fish with concentrations in the eggs she lays (63,136). The milt of fish did not appear to be contaminated among fish with high levels of dieldrin in their fat tissues (136).…”