Ecological status assessment of streams and rivers using benthic macroinvertebrates in the region Inner Oslofjord West in 2013

Summary

During May 2013 47 water course sites were sampled for benthic macroinvertebrates in the area Inner Oslofjord West, in October 26 of these sites were sampled again. An environmental assessment based on these samples indicate that the status among the 47 stations were as follows during the spring: 1 very bad, 5 bad, 14 moderate, 25 good and 1 very good. And in the autumn the statuses among the 26 fall samples were: 5 very bad, 5 bad, 10 moderate, 5 good and 1 very good.