diff --git a/src/main/java/environment/RiverBasin.java b/src/main/java/environment/RiverBasin.java
index aeec34d2343793d7a2e3ede7927c59d287567e5e..0dd891cd4d3a6e479b50b4f17a4921d9859077e5 100644
--- a/src/main/java/environment/RiverBasin.java
+++ b/src/main/java/environment/RiverBasin.java
@@ -106,7 +106,7 @@ public class RiverBasin extends Basin {
 
 	// private int memorySize; // size of the queue
 	// TODO define as many QueueMemory as populations
-	private QueueMemory<Double> lastSpawnerNumbersBeforeReproduction;
+
 	private QueueMemory<Long> lastRecruitments;
 	private QueueMemory<Long> lastRecruitmentExpectations;
 	private QueueMemory<Double> lastProdCapacities; // keep the production capacities of the basin (parameter alpha of
@@ -235,7 +235,6 @@ public class RiverBasin extends Basin {
 		this.yearOfLastNulRep = 0;
 		this.type = Basin.BasinType.RIVER;
 		// this.memorySize = memoryAllQueues;
-		this.lastSpawnerNumbersBeforeReproduction = new QueueMemory<Double>(memorySize);
 		this.lastRecruitments = new QueueMemory<Long>(memorySize);
 		this.lastRecruitmentExpectations = new QueueMemory<Long>(memorySize);
 		this.lastProdCapacities = new QueueMemory<Double>(memorySize);
@@ -430,14 +429,6 @@ public class RiverBasin extends Basin {
 	}
 
 
-	/**
-	 * @return the lastSpawnerNumbersBeforeReproduction
-	 */
-	public QueueMemory<Double> getLastSpawnerNumbersBeforeReproduction() {
-		return this.lastSpawnerNumbersBeforeReproduction;
-	}
-
-
 	public QueueMemory<Long> getLastRecruitments() {
 		return lastRecruitments;
 	}
diff --git a/src/main/java/species/ReproduceAndSurviveAfterReproductionWithDiagnose.java b/src/main/java/species/ReproduceAndSurviveAfterReproductionWithDiagnose.java
index 8904f0025347fb428de26461623d03a04f0f97f8..3452bc7d963d9ea51b3c4ea6e5c3ff409c083aba 100644
--- a/src/main/java/species/ReproduceAndSurviveAfterReproductionWithDiagnose.java
+++ b/src/main/java/species/ReproduceAndSurviveAfterReproductionWithDiagnose.java
@@ -126,7 +126,6 @@ public class ReproduceAndSurviveAfterReproductionWithDiagnose extends AquaNismsG
 
 				// before the party !!!!
 				double fluxBefore = riverBasin.getSpawnerNumberPerGroup(group);
-				riverBasin.getLastSpawnerNumbersBeforeReproduction().push(fluxBefore);
 
 				double b, c, alpha, beta, amountPerSuperIndividual, S95, S50;
 				double numberOfFemaleSpawners = 0.;