Abstract
Levels of polychlorinated biphenyls, PCBs, in liver samples of 111 and 121 flounder (Platichthys flesus L.) and cod (Gadus morhua L.), respectively, were determined gas chromatographically by quantification of 9 individual PCB congeners. The congeners were 28, 52, 101, 118, 153, 138, 180, 170, and 209 (IUPAC numbering system, Ballschmiter and Zell 1980). The fish were caught during 1988 at 5 different stations near or in the Glomma estuary, in the Hvaler archipelago, Norway. The mean level of the sum of the congeners, 1,050 ng/g, found in cod was 3 times higher than the corresponding level found in flounder (361 ng/g). The influences on the variation in PCB levels of sex, season, and distance from the Glomma outlet and waterway were investigated using 1-, 2-, and 3-way ANOVA. The main effects of these factors as well as their possible interactions were considered. An expected decreasing PCB pollution gradient from the mouth of Glomma was found for cod, while PCB levels in flounder seemed to be less dependent on sampling site. However, the sexes in both fish species exhibited a different pattern in their PCB levels. The PCB levels in female cod were significantly affected by the season of sampling, with PCB levels in September/October significantly greater than the corresponding levels in June and November/December. No such effect was found for male cod. In flounder, a significant station effect on the PCB levels was found for females only, and a decreasing PCB pollution gradient was found to be significant. The interactions between the three factors station, season, and sex were different in the two species. There was an interaction between sex and season in cod while in flounder the sex interacted with station. These interaction phenomena require further analysis, since no general procedure exists for analyzing interactions when a biological interpretation is at issue.
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Marthinsen, I., Staveland, G., Skaare, J.U. et al. Levels of environmental pollutants in male and female flounder (Platichthys flesus L.) and cod (Gadus morhua L.) caught during the year 1988 near or in the waterway of Glomma, the largest river of Norway. I. Polychlorinated biphenyls. Arch. Environ. Contam. Toxicol. 20, 353–360 (1991). https://doi.org/10.1007/BF01064402
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DOI: https://doi.org/10.1007/BF01064402