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Fright reaction, mediated by pheromones, is an antipredatory mechanism in the scale-less ‘mojarra’ Gymnocharacinus bergi (Pisces, Characidae). The aim of this study was to characterise and quantify the fright reaction of this species and to analyse the alarm response to different doses of alarm substance. The alarm response consisted in a general decrease in the swimming speed and a tendency to remain...
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