Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Ambient concentrations, uptake, and deposition of DDT in northern anchovy Engraulis mordax Girard
Student Author(s): Kaplan, Paul F.
Faculty Advisor(s): Wheeler, Ellsworth
Pages: 16
Location: Final Papers Biology 175H
Date: June 1969
Keywords: DDT
Abstract: The ambient levels of DDE (approimately 80% of total DDT residues) were determined in the northern anchovy from gas chromatographic analysis of 25 samples of 6 different tissues: female gonad, male gonad, liver, muscle, gill, and brain. Levels were found to range between, 0.11 and 0.35 ppm by wet weight. Direct uptake from seawater by live fish was measured with the use of C14 labeled DDT for four hour incubations in 1 ppb concentrations. Results showed very high concentrations of the DDT in liver, gill, and brain. In four hours liver tissue concentrated DDT an average of 240 times over the initial level, with gill and brain tissue averaging 65 and 45 fold concentrations, respectively, in the same time period. Results show large variations between individual fish in amount and site of deposition. Comparison of normal levels and uptake show that DDT is highly mobile within the fish and seems to move from liver to muscle tissue after original uptake.