Abstract

Short term toxicity research was carried out with Gasterosteus aculeatus in order to determine the cause of fish mortality in an infiltration lake. The waters observed were from two different infiltration lakes and a sludge sedimentation pond belonging to the Provincial Waterworks Noord Holland in Castricum. During the 96 hours of exposure no differences were found with fish kept in standard water. Therefore this research did not lead to an identification of the cause for the observed fish mortality. Results from physico-chemical analyses neither did lead to any cause.