Contaminant residues in the bloater (Coregonus hoyi) of Lake Michigan, 1969-1986

Journal of Great Lakes Research
By: , and 



Residues of DDT, PCBs, and dieldrin in Lake Michigan bloaters (Coregonus hoyi) decreased between 1969 and 1986. All values for contaminant residues were measured and reported as μg/g of whole fish, wet weight; the error limits represented the 95% confidence interval half widths. Total DDT content declined 87%, from 9.9 in 1970, when its use was banned, to 1.3 in 1974, and then averaged 0.88 in 1978–1986 with a low of 0.67 in 1986. Between 1976–1986, p,p’DDD averaged 0.08 and p,p’DDT averaged 0.1; p,p’DDE reached a low of 0.48 in 1980, then averaged 0.53 in 1980–1986. Dieldrin averaged 0.25 until 1974, when it was banned, peaked at 0.55 in 1978, and decreased to 0.20 by 1986. PCBs, first analyzed in 1972, declined 64% (from 5.7 to 2.2) between 1972 and 1980 and were at 1.64 in 1986. The great decline in PCBs occurred following the 1976 ban. A 49% decrease in the lipid content of bloaters from 1980 to 1986 suggested a dietary change possibly due to changing food source makeup.

Publication type Article
Publication Subtype Journal Article
Title Contaminant residues in the bloater (Coregonus hoyi) of Lake Michigan, 1969-1986
Series title Journal of Great Lakes Research
DOI 10.1016/S0380-1330(90)71403-7
Volume 16
Issue 1
Year Published 1990
Language English
Publisher Elsevier
Contributing office(s) Great Lakes Science Center
Description 9 p.
First page 121
Last page 129
Online Only (Y/N) N
Additional Online Files (Y/N) N
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