Dietary fatty acid composition significantly influenced the proactive–reactive behaviour of Senegalese sole ( Solea senegalensis ) post-larvae

•The effect of different oils on coping styles of Senegalese sole larvae was evaluated.•First study to show flatfish larvae had proactive and reactive stress coping style behaviour.•First study to show dietary oil origin significantly influenced fish larval behaviour.•Sole larvae fed with fish oil had significantly higher activity and risk disposition.