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2180270 
Journal Article 
Chlorinated insecticide residues in the eggs of some freshwater fish 
Johnson, LG; Morris, RL 
1974 
Yes 
Bulletin of Environmental Contamination and Toxicology
ISSN: 0007-4861
EISSN: 1432-0800 
PESTAB/74/2291 
11 
6 
503-510 
English 
4215506 
PESTAB Eggs of channel catfish, largemouth bass, walleye, and northern pike were collected from various locations in Iowa rivers and analyzed for organochlorines. Dieldrin was the major residue detected, with highest levels (900 ppb) found at the two locations where high concentrations in fish flesh and water samples had been previously reported. Polychlorinated biphenyls, DDE, TDE, and heptachlor epoxide, were detected in all samples, and aldrin, gamma-chlordane, and alpha-chlordane in some. Residues are correlated with fish size and lipid content. Residues were generally below 200 ppb except in the two most highly contaminated rivers. 
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