diff --git a/src/AnalysisConfigFiles/RecognizerConfigFiles/Towsey.BotaurusPoiciloptilus.yml b/src/AnalysisConfigFiles/RecognizerConfigFiles/Towsey.BotaurusPoiciloptilus.yml
index ac57bf8f2..363af7998 100644
--- a/src/AnalysisConfigFiles/RecognizerConfigFiles/Towsey.BotaurusPoiciloptilus.yml
+++ b/src/AnalysisConfigFiles/RecognizerConfigFiles/Towsey.BotaurusPoiciloptilus.yml
@@ -1,6 +1,11 @@
 ---
 
 # Australasian Bittern = Botaurus poiciloptilus
+#NOTE: The parameter values in this config file were optimised on a data set supplied by Elizabeth Znidersic.
+#      It consisted of 14 consecutive hours of recording from Medeas Cove, St. Helens, Tasmania.
+#      The recordings contained 55 Bittern calls.
+#      Recall = 76%. Precision = 88%.
+
 # Resample rate must be 2 X the desired Nyquist
 ResampleRate: 8000
 # SegmentDuration: units=seconds;    
@@ -22,7 +27,7 @@ Profiles:
         MaxHertz: 200
         MinDuration: 0.3
         MaxDuration: 1.0
-        DecibelThreshold: 6.0
+        DecibelThreshold: 3.0
 
 #################### POST-PROCESSING of EVENTS ###################
 
@@ -47,7 +52,7 @@ BandwidthStandardDeviation: 15
 # 4: Filter the events for excess activity in their upper and lower buffer zones
 NeighbourhoodLowerHertzBuffer: 150
 NeighbourhoodUpperHertzBuffer: 400
-NeighbourhoodDecibelBuffer: 0.0
+NeighbourhoodDecibelBuffer: 2.0
 
 # C: Options to save results files
 #  4: Available options for saving spectrograms (case-sensitive): [False/Never | True/Always | WhenEventsDetected]
diff --git a/tests/Acoustics.Test/AnalysisPrograms/Recognizers/AustBitternTests.cs b/tests/Acoustics.Test/AnalysisPrograms/Recognizers/AustBitternTests.cs
index 7962248cc..5e4afa042 100644
--- a/tests/Acoustics.Test/AnalysisPrograms/Recognizers/AustBitternTests.cs
+++ b/tests/Acoustics.Test/AnalysisPrograms/Recognizers/AustBitternTests.cs
@@ -66,13 +66,13 @@ public void TestRecognizer()
 
             var onlyEvent = (CompositeEvent)events[0];
 
-            Assert.AreEqual(3, onlyEvent.ComponentCount);
-            Assert.AreEqual(7.136, onlyEvent.EventStartSeconds);
-            Assert.AreEqual(12.224, onlyEvent.EventEndSeconds);
+            Assert.AreEqual(5, onlyEvent.ComponentCount);
+            Assert.AreEqual(5.12, onlyEvent.EventStartSeconds);
+            Assert.AreEqual(12.256, onlyEvent.EventEndSeconds);
             Assert.AreEqual(105, onlyEvent.LowFrequencyHertz);
             Assert.AreEqual(180, onlyEvent.HighFrequencyHertz);
-            Assert.AreEqual(24.076815193551525, onlyEvent.Score, TestHelper.AllowedDelta);
-            Assert.AreEqual(0.476507384367336, onlyEvent.ScoreNormalized, TestHelper.AllowedDelta);
+            Assert.AreEqual(21.716400254, onlyEvent.Score, TestHelper.AllowedDelta);
+            Assert.AreEqual(0.9470146022, onlyEvent.ScoreNormalized, TestHelper.AllowedDelta);
         }
     }
 }