Effect of pooled sampling in the Milfersk program

The Milfersk monitoring program is studying the occurrence and biomagnification of contaminants in freshwater ecosystems, mainly Lake Mjøsa. For the last 10 years, individual samples of muscle and liver from brown trout have been analyzed for a wide range of environmental contaminants.

In this report we are statistically evaluating the effect of converting to pooled samples, i.e., 5 individuals constituting one composite sample.