g. , fish duplicate, cylindrical dummy, fish for a variable period without displaying competitive behaviours. The period of this period depended marginally to the tested cues Fig. 1. Particularly, the cylindrical dummy was inspected a bit of longer over other treatments, but actually no main alterations were found, other than the twisting fish reproduction. It may indicate that any foreign object in the fish territory is worth to be overseen and in the case of the twisting fish duplicate context, fish felt more threatened thus they preferred to show competitive displays beforehand.