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Table 1 Description of the aggressive behaviours quantified. An aggression score was calculated as the average frequency of these displays

From: Artificial selection for male winners in the Siamese fighting fish Betta splendens correlates with high female aggression

  Behaviour Description
Frontal display Faces the opponent with unpaired fins and/or opercula extended. Body in an angle between 45 to 90 degrees to the opponent.
Lateral display Exposes the flank to the opponent with unpaired fins and/or opercula distended. Body in an angle of less than 45 degrees to the opponent.
Charge Swims fast in the direction of the opponent.
Caudal swing (tail beats) Waves the caudal fin towards the opponent side.