A number of European countries are angry because the Netherlands has decided to reverse its decision to leave its locks at Haringvliet ajar so that fish can migrate, reports the Telegraaf.

Junior environment minister Joop Atsma told parliament on Monday he has received letters of complaint from the European environment commissioner and from government ministers in Germany, Luxemburg, Switzerland and Austria.
The decision to leave the locks ajar is part of the Rhine treaty which has cost other countries millions of euros in placing fish traps and natural river banks to ensure fish can migrate.
The present Dutch government reversed its decision because it is worried about adverse effects, such as brackish water.
Other European countries have been complaining for months and Atsma has already ordered an investigation into the possibilities for allowing fish into the river. The results are expected in spring 2011.