diff --git a/data/input/northeastamerica/RIO_obs_NEA.xml b/data/input/northeastamerica/RIO_obs_NEA.xml
index 2bcf2541753e71ea6aeb72d3bb8cf67bd535ea7a..8e241cba58bc342a3735662fc9edc2cfc573b412 100644
--- a/data/input/northeastamerica/RIO_obs_NEA.xml
+++ b/data/input/northeastamerica/RIO_obs_NEA.xml
@@ -1,6 +1,10 @@
 <hashtable>
 	<entry>
-		<java-class>fr.cemagref.simaqualife.kernel.AquaticWorld</java-class>
+		<!--
+		
+		<java-class>fr.cemagref.simaqualife.kernel.AquaticWorld</java-class>-->
+		<java-class>environment.RIOBasinNetworkWithContinent</java-class>
+	
 		<fr.cemagref.observation.kernel.ObservablesHandler>
 			<observers>
 				<environment.RIOBasinNetworkObserverWithContinent>
diff --git a/src/main/java/environment/RIOBasinNetwork.java b/src/main/java/environment/RIOBasinNetwork.java
index 7d10bfb591d8cb2c39ac9121fab682d9a2dc609d..382149f89d152c08835748388410de6a89654c9f 100644
--- a/src/main/java/environment/RIOBasinNetwork.java
+++ b/src/main/java/environment/RIOBasinNetwork.java
@@ -5,7 +5,6 @@ import java.util.List;
 import java.util.Map;
 
 import environment.OffshoreBasin.OffshoreBasinFunction;
-import fr.cemagref.observation.kernel.ObservablesHandler;
 import fr.cemagref.simaqualife.kernel.AquaNismsGroup;
 import fr.cemagref.simaqualife.kernel.util.TransientParameters.InitTransientParameters;
 import fr.cemagref.simaqualife.pilot.Pilot;
@@ -32,22 +31,12 @@ public abstract class RIOBasinNetwork extends BasinNetwork {
 
 	protected transient Time time;
 
-	protected static transient ObservablesHandler cobservable;
-
-
-	public ObservablesHandler getCobservable() {
-		return cobservable;
-	}
-
 
 	@Override
 	@InitTransientParameters
 	public void initTransientParameters(Pilot pilot) {
 		time = new Time();
 
-		if (cobservable == null) {
-			cobservable = pilot.addObservable(this.getClass());
-		}
 	}
 
 
diff --git a/src/main/java/environment/RIOBasinNetworkWithContinent.java b/src/main/java/environment/RIOBasinNetworkWithContinent.java
index a34674ef6fdfec671f08ba0341de7bea692e4702..990a67f83422532404809eb7a73fec1d7805a58e 100644
--- a/src/main/java/environment/RIOBasinNetworkWithContinent.java
+++ b/src/main/java/environment/RIOBasinNetworkWithContinent.java
@@ -24,6 +24,7 @@ import com.thoughtworks.xstream.XStream;
 import com.thoughtworks.xstream.io.xml.DomDriver;
 
 import environment.OffshoreBasin.OffshoreBasinFunction;
+import fr.cemagref.observation.kernel.ObservablesHandler;
 import fr.cemagref.simaqualife.kernel.util.TransientParameters.InitTransientParameters;
 import fr.cemagref.simaqualife.pilot.Pilot;
 import miscellaneous.QueueMemoryMap;
@@ -55,6 +56,13 @@ public class RIOBasinNetworkWithContinent extends RIOBasinNetwork {
 
 	private transient Map<String, Path2D.Double> mapContinent;
 
+	protected transient ObservablesHandler cobservable;
+
+
+	public ObservablesHandler getCobservable() {
+		return cobservable;
+	}
+
 	class Record implements Comparable<Record> {
 
 		private int order;
@@ -215,6 +223,10 @@ public class RIOBasinNetworkWithContinent extends RIOBasinNetwork {
 
 		super.initTransientParameters(pilot);
 
+		if (cobservable == null) {
+			cobservable = pilot.addObservable(this.getClass());
+		}
+
 		FileReader reader;
 		Scanner scanner;
 
diff --git a/src/main/java/species/DisperseAndMigrateToRiverWithMultiNomDistriAndDeathBasin.java b/src/main/java/species/DisperseAndMigrateToRiverWithMultiNomDistriAndDeathBasin.java
index 2b2d10266404b423c4203aed6182e27ea74fe030..f231f1ababdec40a0a87c3a96396c6ba25148cab 100644
--- a/src/main/java/species/DisperseAndMigrateToRiverWithMultiNomDistriAndDeathBasin.java
+++ b/src/main/java/species/DisperseAndMigrateToRiverWithMultiNomDistriAndDeathBasin.java
@@ -13,6 +13,7 @@ import com.thoughtworks.xstream.io.xml.DomDriver;
 
 import environment.InshoreBasin;
 import environment.RIOBasinNetwork;
+import environment.RIOBasinNetworkWithContinent;
 import environment.RiverBasin;
 import environment.Time;
 import environment.Time.Season;
@@ -247,14 +248,16 @@ public class DisperseAndMigrateToRiverWithMultiNomDistriAndDeathBasin extends Di
 					}
 				}
 			}
+			System.out.println(this.getClass().getSimpleName());
 			System.out.println(" total abundance in river basins: " + group.getFishEffective());
-			System.out.println("female spawners: " + group.getFemaleSpawnerEffective() + " \tmale spawners: "
+			System.out.println("  female spawners: " + group.getFemaleSpawnerEffective() + " \tmale spawners: "
 					+ group.getMaleSpawnerEffective());
 
 			// --------------------------------------------------------------------------------------------------
 			// update the observers
 			// ------------------------------------------------------------------------------------------------------
-			group.getEnvironment().getCobservable().fireChanges(group.getEnvironment(), pilot.getCurrentTime());
+			((RIOBasinNetworkWithContinent) group.getEnvironment()).getCobservable().fireChanges((group.getEnvironment()),
+					pilot.getCurrentTime());
 		}
 	}
 }
diff --git a/src/main/java/species/MigrateBetweenOffshores.java b/src/main/java/species/MigrateBetweenOffshores.java
index 4fda5d9af9e1480c8fd5cdc93cbf66c5b15d39ba..b2425034c638162172211fff1bc9ad607991cfbc 100644
--- a/src/main/java/species/MigrateBetweenOffshores.java
+++ b/src/main/java/species/MigrateBetweenOffshores.java
@@ -10,6 +10,7 @@ import com.thoughtworks.xstream.io.xml.DomDriver;
 
 import environment.Basin;
 import environment.OffshoreBasin;
+import environment.RIOBasinNetworkWithContinent;
 import environment.RiverBasin;
 import environment.Time.Season;
 import fr.cemagref.simaqualife.kernel.processes.AquaNismsGroupProcess;
@@ -65,7 +66,9 @@ public class MigrateBetweenOffshores extends AquaNismsGroupProcess<DiadromousFis
 			// --------------------------------------------------------------------------------------------------
 			// update the observers
 			// ------------------------------------------------------------------------------------------------------
-			group.getEnvironment().getCobservable().fireChanges(group.getEnvironment(), pilot.getCurrentTime());
+			((RIOBasinNetworkWithContinent) group.getEnvironment()).getCobservable().fireChanges((group.getEnvironment()),
+					pilot.getCurrentTime());
+
 		} else if (group.getEnvironment().getTime().getSeason(group.getPilot()) == migrationSeasonToReachSummeringOffshore) {
 
 			for (OffshoreBasin winteringOffshoreBasin : group.getEnvironment().getWinteringOffshoreBasins()) {
@@ -93,7 +96,8 @@ public class MigrateBetweenOffshores extends AquaNismsGroupProcess<DiadromousFis
 			// --------------------------------------------------------------------------------------------------
 			// update the observers
 			// ------------------------------------------------------------------------------------------------------
-			group.getEnvironment().getCobservable().fireChanges(group.getEnvironment(), pilot.getCurrentTime());
+			((RIOBasinNetworkWithContinent) group.getEnvironment()).getCobservable().fireChanges((group.getEnvironment()),
+					pilot.getCurrentTime());
 		}
 	}
 }
\ No newline at end of file