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Animal Cognition

, Volume 21, Issue 6, pp 813–820 | Cite as

Quantity discrimination in fish species: fish use non-numerical continuous quantity traits to select shoals

  • Wei Xiong
  • Lian-Chun Yi
  • Zhonghua Tang
  • Xin Zhao
  • Shi-Jian FuEmail author
Original Paper

Abstract

Fish typically prefer to live in big shoals due to the associated ecological benefits. Shoaling is a behavior that depends on the ability to quantitatively discriminate. The fundamental mechanism involved in quantity discrimination determines whether fish can discriminate a shoal using numerical discrete cues (e.g., number of shoal members), non-numerical continuous traits (e.g., total body surface area) or both; however, the mechanism is currently a controversial topic. In the present study, we used a spontaneous choice experiment to test whether guppy (Poecilia reticulata), zebrafish (Danio rerio), Chinese crucian carp (Carassius auratus) and qingbo (Spinibarbus sinensis) rely on continuous (i.e., body surface area) or discrete (i.e., number of shoal members) information for shoal selection by altering the body surface area (cumulative body surface area ratio of 3:2 or 1:1) between two stimulus shoals with a different number of members (2 individuals vs 3 individuals). All four fish species preferred to shoal with the stimulus shoal with the larger cumulative surface area even if the shoal had fewer members; however, fish showed no shoal preference when the cumulative surface body areas of both stimulus shoals were equal. Furthermore, qingbo did not numerically discriminate between a shoal with 1 individual and a shoal with 3 individuals when the cumulative surface areas of both stimulus shoals were equal; however, qingbo showed a preference for the shoal with the larger cumulative surface area when the two stimulus shoals each had 3 individuals. In conclusion, the present study demonstrated that all four fish species relied only on non-numerical continuous quantity information for shoal selection, at least under a difficult task (i.e., 2 vs 3).

Keywords

Continuous variables Fish species Numerical cue Quantity discrimination Spontaneous choice experiment 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (no. 31670418).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

Supplementary material

10071_2018_1214_MOESM1_ESM.xlsx (35 kb)
Supplementary material 1 (XLSX 35 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Laboratory of Evolutionary Physiology and Behavior, Chongqing Key Laboratory of Animal BiologyChongqing Normal UniversityChongqingChina

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