Social buffering of behavioural stress response in two fish species, Nile tilapia (Oreochromis niloticus) and koi carp (Cyprinus carpio)

• Published in: Ethology Vol. 130; no. 7
• Main Authors: Pintos, Santiago, Lucon‐Xiccato, Tyrone, Vera, Luisa María, Conceição, Luis, Bertolucci, Cristiano, Sánchez‐Vázquez, Javier, Rema, Paulo
• Format: Journal Article
• Language: English
• Published: Hamburg Blackwell Publishing Ltd 01.07.2024
• Subjects: anxiety‐like behaviour; Aquaculture; Carp; Conspecifics; Cyprinus carpio; Cyprinus carpio koi; Enrichment; farmed fish; Field tests; Fish; fish behaviour; Freezing; Group size; Indicators; koi; open field test; Oreochromis niloticus; Shoals; Social behavior; social buffering; social class; social enrichment; Social interactions; Species; Stress response; Thigmotaxis; Tilapia
• DOI: 10.1111/eth.13464
• ISSN: 0179-1613

The presence of conspecifics plays a crucial role in mitigating stress responses in social teleost species and holds potential for enhancing welfare in captive fish. While studies on social buffering effects have typically focussed on single species, marked interspecific differences can exist. Here, we conducted an analysis of social buffering of stress response in two of the most extensively farmed fish, the Nile tilapia and the koi carp. Subjects were exposed to a behavioural stress response assay (open‐field test) in three conditions simulating increasing levels of social enrichment: isolation, pairs, or shoals of five fish. We obtained five stress indicators from the assay: thigmotaxis, freezing, activity, erratic movements and interindividual distance in conditions with more than one fish. In both species, erratic movements significantly decreased with increasing levels of social enrichment, suggesting a similar social buffering effect. However, other indicators revealed species differences. Koi carp, but not Nile tilapia, showed a socially‐mediated reduction in thigmotaxis, whereas Nile tilapia, but not Koi carp, showed a socially‐mediated reduction in freezing behaviour. Furthermore, social enrichment determined opposite effects on the activity of the two species: Nile tilapia were more active as group size increased, whereas the opposite trend was found in koi carp. Finally, Nile tilapia showed increased interindividual distance with increasing social group size, whereas no changes were observed for koi carp. Our study indicates that the buffering effects of social enrichment on the behavioural stress response do not completely overlap between different fish species, highlighting the importance of developing finely‐tuned species‐specific enrichments and welfare indicators. Does social buffering differ among fish species? We assessed social buffering effects on the behavioural stress response of two of the most extensively farmed fish: the Nile tilapia (Oreochromis niloticus) and the koi carp (Cyprinus carpio). Our findings revealed that social buffering effects on behaviour do not completely overlap between different fish species, highlighting the importance of developing finely‐tuned species‐specific enrichments and welfare indicators.