Aggressiveness-related behavioural types in the pearly razorfish

Behavioural types (i.e., personalities or temperament) are defined as among individual differences in behavioural traits that consistent over time and ecological contexts. widespread nature play a relevant role many evolutionary processes. In this work, we studied for the first consistency of aggressiveness pearly razorfish, Xyrichtys novacula, using mirror test: classic method to define aggressive types. The experiments were carried out semi-natural arenas monitored through novel Raspberry Pi-based recording system. experimental set up allowed us obtain repeated measures aggressivity scores during four consecutive days. decomposition phenotypic variance revealed significant repeatability score ( R ) 0.57 [0.44–0.60], suggesting high predictability variation existence different Aggressive emerged irrespective body size, sex internal condition individual. Razorfishes ubiquitous group fish species occupy sedimentary habitats most shallow waters temperate tropical seas. These known forming strong social structures playing ecosystem functioning. Therefore, our work provides insight into an component may poorly processes occurring species.