diff --git a/data/input/observersCharts.xml b/data/input/observersCharts.xml
index 3907b120e8f3792c5873b44ebaeab920b1b43c6f..e854e38e85d2003b5620193411a646f1d43dcfc4 100644
--- a/data/input/observersCharts.xml
+++ b/data/input/observersCharts.xml
@@ -41,11 +41,16 @@
                     <margin>0</margin>
 					
                 </pikelake.environment.Movement2DWithinShapeObserver>
+                <fr.cemagref.observation.observers.jfreechart.TemporalSerieChart>
+                    <graphType>LINE</graphType>
+                    <title>Biomass</title>
+                    <variableName>pikesBiomass</variableName>
+                </fr.cemagref.observation.observers.jfreechart.TemporalSerieChart>
             </observers>
         </fr.cemagref.observation.kernel.ObservablesHandler>
     </entry>
     
-    <!-- entry>
+    <entry>
         <java-class>pikelake.pikes.Pike</java-class>
         <fr.cemagref.observation.kernel.ObservablesHandler>
             <observers>
@@ -57,18 +62,5 @@
             </observers>
         </fr.cemagref.observation.kernel.ObservablesHandler>			
     </entry>
-    
-    <entry>
-        <java-class>pikelake.pikes.PikesGroup</java-class>
-        <fr.cemagref.observation.kernel.ObservablesHandler>
-            <observers>
-                <fr.cemagref.observation.observers.jfreechart.TemporalSerieChart>
-                    <graphType>LINE</graphType>
-                    <title>Biomass</title>
-                    <variableName>pikesBiomass</variableName>
-                </fr.cemagref.observation.observers.jfreechart.TemporalSerieChart>
-            </observers>
-        </fr.cemagref.observation.kernel.ObservablesHandler>			
-    </entry-->
 	
 </hashtable>